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Var. 3, undulata.-Eyes and palpi of male as in the forma princip. Cephalothorax dark brownish-yellow, with black margins and the pars cephalica blackish on the sides; sternum black, with a longitudinal yellowish middle line; abdomen brownish-gray, with a longitudinal, tapering, grayish-white middle band or line sinuated in the margins and geminated by a black line, as also with two large undulated grayishiwhite bands, one on each side.

6.-Length of body 9?, of cephaloth. 3.) ; breadth of same 13 millim.; length of mandibles 23, of palpi 43 millim. Legs: I 26, II 191, III 10, IV 163; metat. + tars. I 10, pat. + tib. + metat. + tars, IV 103 millim.

9 jun.Length of body 7.1, of cephaloth. 23, breadth of cephal. 2, length of mandibles nearly 13, of palpi 3.1 millim. Legs: I 193, II 13, III 7, IV 12); metrit. + tars. I 73, pat. + tib. + metat. + tars. IV 114 millim.

Var. 7, debilis.—Smaller than the former. Interval between the two lateral eyes scarcely less than that between the anterior and posterior central eyes. Tibial joint of the male palpi but little longer than the patellar joint. Sternum often blackish, at least at the sides; abdomen yellowish above, in general with a ramified black middle line, blackish on the sides below; color for the rest about as in the forma princip.

8.-Length of body 5.1, of cephaloth. 2, breadth of same nearly 1.) millim.; length of palpi 2 millim. Legs: I 171, II 12, III 5;, IV 113 ; metat. + tars. I 64, pat. + tib. + metat. + tars. IV 74 millim.

9 jun (?).—Length of body 67, of' cephaloth. ?, breadth of same 1! millim. Legs: I 15, II 9., III 47, IV 9 millim.; metat. + tars. I 53, pat. + tib. + metat. + tars. IV nearly 61 millim.

of which I have seen very many adult males and (young?) females, appears to me gradually to pass into the principal form, and is therefore probably not a peculiar species, as I at first believed. In the only full-grown male of var. ß that I have seen, the distance between the first and second teeth of the anterior margin of the clairfurrow is but little greater than that between the second and third teeth.

The citation from Walckenaer is of course very uncertain, his descrip)tion, like that given by Hentz, being quite insufficient; but as the species here characterized by me no doubt is the T. grallator of IIentz, and this author considers his T. grallator to be identical with T. elongata Walck., I think I may safely adopt this latter name, which has the prority. T. grallator Keyserl. I consider a tolerably sure synonym, although the specimens described by that author has more teeth on til margins of the mandibles' claw-furrow and longer legs than I have observed in this species; but the number of those teeth, as well as the length of the legs, appear to be pretty variable; even the relative distances between the eyes, as also those between the teeth of the mandibles' claw-furrow, are not always the same.

Of T. clongata, which appears to be common in most parts of the United

The var. Yg

7

the ļ from Manitou, Colo. (July 12)

States, the collection contains a full-grown ở and a young & of the principal form from Boulder, Colo., captured June 29; a full-grown 8 and a young & of the var. B, undulata, the s from Idaho (captured July 6), var. 7, debilis, collected at Boulder, Colo. (among them one ad.) (June 24), Golden, Colo. (July 3), and the Great Salt Lake, Utah (July 23). In the adult male, both of var. 3 and var. 7, the abdomen is wanting. I hare also examined many specimens of the principal form and of var, y froin Wisconsin. The measures above given of these two varieties are taken from examples from that State.

I must confess that I am not at all certain that T. elongata is specifically different from the true T. extensa (Linn.) or T. norwicki L. Koch. The number of the teeth of the claw-furrow and the arrangement of these teeth appear to be slightly different in these two forms, but these characteristics are somewhat variable in both of them. The European T. extensa has the sternuun black, with a triangular yellow spot or line in the middle; but this is also the case in the variety undulata of the American species; also in T. extensa the apophysis of the tibial joint of the palpus is furnished with a short blunt process toward the middle of the inner side. At all events, T. elongata differs less from T. extensa than do for instance 1. islandri (Scop.) Thor. and T. obtusa C. L. Koch.

Section RETITELARLE.

Fam. THERIDIOIDE.

Gen. LINYPIIIA Latr., 180:1. 3. L. orophila n.

Cephalothorax, mandibles, maxillae, palpi, and legs pale testaceous; cephalothorax with black margins; eyes black, large, close together, and prominent, the four central ones forming a trapezium broader behind than in front and as long as broad behind, little shorter than the height of the clypeus; first pair of legs the longest; thighs and übiæ with traces of black rings; abdomen olive-colored, with sinuated oblique bands or lines on each side above, followed on the back by a sint row of transverse angular lines, sides also with a row of spots below, these markings being all of a pale yellowish hue, as is also at vast t?... posterior part of the belly and the region around the mamillæ; valypalc red lish-brown, with a longitudinal narrow middle ridge below, au forming, seen from the side, an oblong protuberance slightly two-cothed at the extreme apex.- ad. Length about 23 millim.

Female.-.; kulothorur shorter than patella and tibia of the fourth pair togetl r, abla: '4, rounded in the sides, with the pars cephalica rather large and lig! the breadth of the clypeus is a little greater than half the breadt. of the pars thoracica, the height of the clypeus is but little greater that the length of the area of the central eyes. Eyes large, prominent, and close together, not much differing in size; the

posterior central eyes are, however, larger, and the anterior central eyes appear to be a little smaller than the rest. Seen from above, the hind row of eyes is straight; the front row, seen from before, is also nearly straight, very slightly curved backward. The four central eyes, of which the anterior are placed on a prominent tubercle, form a trapezium much broader behind than in front and as long as broad behind; the intervals between the eyes of the hind row are nearly equal, and scarcely as large as half the diameter of one of those eyes, the interval between the anterior lateral and the anterior central eyes is at least half as great again as that between these latter eyes and fully as great as the diameter of a lateral eye; the lateral eyes are contiguous. Ster. num very large, triangular, with slightly rounded sides, and the apex directed backwarı, broadly truncate in front, but little longer than broad, slightly convex. Jandibles a little thicker than the thighs of the first pair, nearly cylindrical, somewhat narrowed on the inner side toward the apex, about 24 times as long as broacì;.claw rather long and slender. Jaxilliæ about half again as long as broad, nearly ovate, broadly and obliquely truncate on the inner side of the apex. Labium transversal, slightly rounded at the apex. Palpi slender, the tibial joint nearly thrice as long as broad, the tarsal joint gradually tapering toward the apex, longer than the two preceding joints together. Legs slender; first pair longer than the second and fourth, which are nearly of the same length. (In the only example examined, all the spines of the legs are broken off; on the tibia, but not on the femora and metatarsi, there are distinct traces of spines lost.) Abdomen longer than broau, tapering behind, nearly ovate; seen from the side, the culru forms a short and thick protuberance directed backward, strongly convex below, and slightly bifid or two-toothed at the extreme apex: this protuberance is about as thick as the posterior thighs and about half as long again as thick; seen from below, the vulva is about as long as broad at the base, tapering toward the blunt apex very uneven, with a narrow ridge along the middle; the slightly incrassated apex of this ridge appears to reach a little longer backward than the rest of the vulva.

Color.Cephalothorax pale testaceous, with a fine black margin; eyes placed on black spots. Sternum of a sooty testaceous bue, with the margins blackish ; labium blackish. Mand:bles and maxilla pale testa. ceous, the claw of the former pale reddish. Palpi and legs pale testa. ceous, somewhat darker toward the extremity; the tibia show more or less distinct traces of a sooty ring near the base, and the thighs traces of such a ring toward the apex. The abdomen is above and on the sides greenish-black or olive-colored, with pale yellowish markings; it has in front, on each side above, a broad short band, somewhat dilated at the posterior end, which bands together nearly form a coarse / above the petiolum; near the middle line of the back this marking is followed by two pairs of short longitudinal lines, of which at least the hindmost are curved outward; the posterior end of these lines is pro

duced obliquely downward and backward, thus forming one short band and one somewhat curved or sinuated line on each side; then follows on the back, three or four transversal angularly bent lines, gradually diminishing in length. The sides of the abdomen, toward the belly, show also a longitudinal row of three pale spots, or streaks, of which the foremost is the largest. The region round the mamillæ is pale yellowish, as is also the belly, which shows a large, irregular, sooty patch behind the vulva. The vulva is of a pale reddish brown hue, the mamillæ pale yellowish, darker at the extreme apex.

Length of body 23, of cephalothorax somewhat more than 1 millim. Legs: 1 51, legs II and IV 5 millim., patella + tibia iv 11 millim.

A single specimen, a female, was captured under a stone on Gray's Peak (about 14,000 feet abore the level of the sea), a little below the summit, July 7, 1875.

Gen. ERIGONE Sav. et Aud., 1825–27. 4. E. cacuminum n.

Brown, with the palpi and legs brownish-yellow, darker at the extremity; abdomen olivaceous or brownish-gray; cephalothorax as long as patella + tibia of the 4th pair, the pars cephalica large; slightly sloping from the middle toward the eyes; height of clypeus a little greater than length of the area of the central eyes, this area being nearly double as broad behind as in front, and a little shorter than broad behind; eyes small, the fore lateral ones little if at all larger than the eyes of the hind row; claw-furrow of the mandibles armed with a row of 5 teeti; vulva forming a transverse, elevated, uneven area, which is black at the ends and reddish-brown in the middle.- ad. Length about 3.1 millim.

Female.Cephalothoràr as long as patella and tibia of the 4th pair of legs, rather abruptly but slightly narrowed between the palpi and the coxæ of the 1st pair; the pars thoracica large, rather slightly rounded in the sides, the pars cephalica shortish, broad with the an. terior angles broadly rounded ; the breadth of the clypeus equals about 3 of the greatest breadth of the pars thoracica. The cephalic furrows are but slightly.marked. On each side of the pars thoracica are three shallow and short depressions.

The ordinary middle fovea is rather large, shallow, and forms the apex of the posterior declivity, which is well defined, forming a triangle a little larger than broad. Seen in profile, the back of the cephalathorax is straight and gradually ascending about to the middle of the pars cephalica, where it is convex, and then slightly sloping toward the eyes; the pars cephalica has above some foreward-directed hairs. The height of the clypeus is a little greater than the length of the area of the central eyes and nearly equals the length of the line occupied by three eyes of the front row. Sternum large, a little longer than broad, slightly rounded on the sides, broadly truncate in front, slightly convex, shining, strewed

with tine hairs. The eyes are small and of nearly equal size, with exception of the anterior central ones, which are evidently smaller than the other eyes; the anterior lateral eyes are little, if at all, larger than the posterior central and lateral eyes. The hind row of eyes is, seen from above, nearly straight; seen from in front, this row is strongly curved downward ; the front row is curved a little upward. The central eyes form a trapezium nearly double as broad behind as in front, and a little shorter than broad behind. The interval between the posterior central eyes, which is fully as great as the diameter of one of these eyes, is a little smaller than that between the posterior lateral and cen. tral eyes and as great as the interval between the anterior and posterior centrals; the small anterior central eyes are nearly contiguous; the lateral eyes of the same side are contiguous; the interval between the anterior lateral and central eyes equals the diameter of the former. The mandibles are ovato-cylindrical, strong, and thick, their length equaling thrice the height of the clypeus; seen from the side, they are nearly ovate and strongly couvex toward the middle; they are smooth, hairy at the apex, with the claw-furrow armed with a single row of five rather strong teeth. The maxillæ are about half as long again as broad, rounded on the outer side toward the apex and at the apex, inclined toward the labium, which is a little broader than long, rounded at the apex. Palpi rather slender; the tibial joint, which is about two and a half times as long as the patellar, is slightly and gradually incrassated toward the extremity; the tarsal joint is very slightly narrowed toward the apex, not longer than the two preceding joints together. The legs are of mod erate length, rather slender, spread with longish not thickly set hairs the thighs are gradually, not abruptly narrowed at the base; the fourth pair of legs is the longest, with the tibia at least three times as long as the patella. The abdomen is inversely ovate, rather elongate, obtuse in front and behind, spread with fine, short hair, or down; the vulva is very simple, consisting of a rather large, uneven, transverse elevation at the margin of the rima genitalis.

Color.Cephalothorax, mandibles, and maxillæ brownish; sternum dusky testaceous, with the margins darker; labium blackish ; abdomen of an olivaceous or brownish-gray hue; pulpi and legs brownish-yellow, darker at the extremity; the vulva forms a transversal area, which is black at the ends and reddish brown in the middle, this middle portion being a little broader than the black spots formed by the extremities of the area.

Length of body 31, of cephalothorax nearly 1} millim.; breadth of cephalothorax 1 millim.; length of legs I a little more than t, of legs II 1, of III nearly 3.), of IV 43 millim.

A few female specimens of this species were found under stones on Gray's Peak, a little below the summit, July 7.

5. E, strabo n.

Cephalothorax yellowish-brown, slightly ascending and somewhat

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