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of their tarsus longer than the legs of the third pair. The four anterior tibiæ are without spines; the anterior metatarsi bave 1. 1. spines below; the tibiæ of the third pair have 2. 1. spines in front, 1. 1. behind, and 2. 2. 2. below. The abdomen is elongate, ovato-elliptical. The vulva consists of a large flat area truncate in front, and with a fine longitudinal middle costa ; on each side, behind and near the margins, this area vulvæ shows a furrow and a fine costa close to each other, these costæ being curved inward and united with each other behind; the area inclosed by them is thus limited behind by a wc-formed ridge, and is scarcely broader than long, and but very slightly narrowing forward. Close to each side of this area the margins of the whole area vulvæ are gradu. ally incrassated backward and curred inward, forming two large, low tubercles behind the said smaller area.

Color.Cephalothorax black, with black hairs. Sternum, mandibles, and labium dark brown. Maxilla dusky testaceous, darker in the middle, pale at the apex. Palpi blackish, with the femoral joint and the base of the patellar joint dusky testaceous. Legs for the greatest part black, yellowish at the base; the coxæ are of a sooty, testaceous hue, black at the apex above; the thighs are black, those of the first pair broadly testaceous at the base on the inner side, and also, though less distinctly, on the outer; the following thighs are also more or less broadly and evidently paler at the base; the patellie are black at the apex, blackish testaceous at the base; the black tibiæ have two longitudinal blackish testaceous lines above (less distinct on the posterior tibiæ); the tarsi and the anterior metatarsi are rusty-brown, the posterier metatarsi piceous. The abdomen is black with brownish-black hairs, the belly grayish black; the pulmonary shields brownish-yellow, bordered with black; the area vulve is pale yellowish, with the posterior costæ and tubercles piceous.

Length of body 73, of cephalothorax 3 millim.; breadth of cephalothorax 2} millim. Length of legs: I 73, II 63, III 6, IV 91 millim.; patella + tibia IV 24 millim.

A single female was captured at Manitou, Colo., July 12. This spider is no doubt closely allied to the European P. petiveri (Scop.) or P. subterranea (C. L. Koch), but is, I think, a separate species.

Section LATERIGRADÆ.

Fam. THOMISOIDÆ.

Subfam. THOMISINA.

Gen. XYSTICUS (C. L. Koch), 1835.

13. I. cunctator n.

Cephalothorax somewhat broader than long, as long as patella + tibia of the first pair, brown, with a large whitish middle band, inclosing a grayish-brown, rather obtuse, wedge shaped patch in front and a small triangular black line behind ; legs grayish-white, with a longitu

dinal whitish line above, the auterior ones brownish above, with brownish and black points, their metatarsi immaculate, the posterior legs paler, with black spots forming distinct transversal bands above; tibia of the first pair with 2. 2. 2. 2., second with 2. 2. 2. 1. spines beneath; metatarsi of first and second pairs with 5 pairs of spines; back of the abdomen brown, with a very large grayish-white middle band, coarsely dentated on the margins, behind; vulva consisting of a large black rounded fovea having a narrow septum along the middle. - £ all. Length about 64 millim.

Female.Cephalothorax as long as patella + tibia of the 1st pair, slightly longer than broad, nearly truncate in front; seen from the side, its back between the posterior declivity and the hind central eyes is rather strongly convex, less strongly convex and more slightly sloping in front than behind; it is strewed with coarse bristles, and has a long, strong, curved bristle on each side of the pars cephalica under the hind central eyes; the clypeus shows six bristles in the margin, and one in the middle, somewhat above the margin. The area formed by the four central eyes is evidently broader than long, rectangular, at least not broader behind than in front. The sternum and parts of the mouth are, of the same form as in X. cristatus and other typical species of the genus, strewed with hairs, the mandibles and palpi also with coarse bristles. The legs of the first pair are thrice as long as cephalothorax, evidently (with the length of their tarsus) longer than those of the second pair; the legs are all strewed with bristles, hairs, and spines, the difference between spines and bristles not being always easy to determine; the thighs have one spine above, the first prir, moreover, two or three spines in front; the spines on the under part of the anterior tibiee and metatarsi are rather strong; the tibiæ of the first pair have 2. 2. 2. 2. spines, those of the second pair 2. 2. 2. 1. spines beneath; the four anterior metatarsi show, seen from beneath, five pairs of spines, the third pair belonging to the sides of the joint, i. e., these metatarsi have 2. 2. 2. spines beneath, 1. in front, and 1. behind. The abdomen is evidently longer than broad, but slightly rounded; nearly truncated in front, gradually somewhat broader backward to behind the middle, then triangularly tapering with rounded sides, longitudinally wrinkled in the sides, transversely wrinkled on the upper part, behind. The vulva consists of a very distinct, deep, almost circular fovea ; it is but little longer than broad, strongly rounded in front and in the sides, slightly tapering behind, bluntish at the apex, and bordered by a narrow, rather high margin, which is not depressed or open behind; along the bottom of this fovea is seen a low, narrow, slightly elevated septum, which is not dilated at the apex; in the bottom of the fovea, there appears also to be a very short, low, longitudinal costa close to the middle of the septum, on each side.

Color.—The cephalothorax has along the middle a very broad band, the breadth of this band being but a little smaller than that of the

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clypeus; the band has in front a large, pale, grayish-brown patch, with the sides at first nearly parallel, then in the middle this patch is slightly dilated and rounded, at last triangularly narrowed, almost wedgeshaped, not much pointed ; a little behind its apex, and commencing from the central furrow, is a little black triangle, or short line, tapering backward. The sides of the cephalothorax, on each side of the middle band, are brown, the extreme lateral margin white; each of these brown side-bands ends behind with two rather large black spots, separated by a white spot or short broad line. The sternum and parts of the mouth are grayish-white, somewhat mottled with-brownish. The legs are grayishwhite, densely mottled with brown and black points; the four anterior ones are brownish above, with a whitish longitudinal line reaching to the end of the tibiie; the thighs of the first pair have a few more conspicuous small black spots in front, above; the 4 hinder legs are grayish, with a white line above, and spread with smaller and larger black spots, which form a broken ring or transverse band toward the apex of the thighs above; two such rings on the patellæ and tibiæ (and at least traces of two rings on the metatarsi), one at the apex, the other at the base; the anterior metatarsi and tarsi are brownish-gray, without rings. The back of the abilomen is along the middle whitish-gray, strewed with small black points, and brown in the sides; the whitishgray middle band is double as broad (about 2 millim.) as the brown side-bands, slightly dilated behind the middle, and then tapering, its posterior portion being coarsely dentated in the margins; the sides of the abdomen and the belly are whitish-gray, somewhat brownish in the side-wrinkles; the belly shows two rows of brownish points; on the outer side of the pulmonary shields are two black spots, the posterior nearly ring-shaped, open inward. The rulva is black, the mamillæ grayishwhite; the hairs and bristles of the body are black, the spines on the upper part of the legs also black, on the under part pale brownish, at least on the anterior legs.

Length of body 63, of cephalothorax 3} millim.; breadth of cephalothorax 3, of clypeus 14 millim.; length of abdomen 43, greatest breadth of same 33 millim. Length of legs : I9}, II 8, III 5, IV 7, of pat. + tib. I 3}, of pat. + tib. IV 24 millim.

A single female specimen of this species was captured at Boulder, Colo., June 29. It is very nearly related to X. cristatus (Clerck) and its European allies, but may, I think, be without difficulty distinguished by the marks in the above description. Thom. ferox Hentz (1. c., V, p. 445, pl. xxiii, fig. 3) appears also to be a closely related species.

Gen. OXYPTILA Sim., 1864. 14. 0. conspurcata n.

Cephalothorax as long as patella + tibia of the first pair, equably and finely coriaceous, provided with clavated bristles on the clypeus, dark brown, with a longitudinal rusty-brown middle band and an irregular

rusty-brown band on each side ; legs dark brown, pale at the base, the hinder pairs rather paler, with a black ring on the tibia and metatarsus ; thighs of the first pair with one spine in front, the other thighs without spines, anterior tibiæ with two, anterior metatarsi with three pairs of strong spines beneath; abdomen brownish above, mottled with black spots and strewed with small spatulate bristles; vulva consisting of a little pale Y-shaped fovea bordered on each side behind by a brown tubercle.— ad. Length about 4 millim.

Female.--Cephalothorax as broad as long, rather longer than patella + tibia of the first or second pair, slightly rounded in front, finely and equably coriaceous, thinly spread with small appressed bristles, the clypeus being furnished with some strong club-shaped bristles. Seen in profile, the cephalothorax is high, very steep behind, the back being perfectly straight to the hind central eyes, the forehead then sloping. The front row of eyes is moderately curved upward, the hind row strongly curved backward ; the area occupied by the central eyes, which are the smallest of the eight and of nearly equal sizes, is longer than broad, scarcely perceptibly broader behind than in front; the interval between the front and hind central eyes is greater than the height of the clypeus, and much shorter than the interval between the hind central and hind lateral eyes, which distance is nearly half again as great as that between the two hind centrals; the interval between the fore central eyes is greater than that between them and the fore laterals, which are much larger than the other eyes; the interval between the two lateral eyes is somewhat smaller than that between the fore and hind centrals. The sternum is nearly ovate, smooth and hairy, as are also the maxille and labium; the mandibles are coriaceous and provided with some bristles; their length is at least double as great as the height of the clypeus. The palpi are clothed with bristles, of which some are blunt and even clavate. The thighs of the first pair have a blunt spine or coarse bristle in front; the other thighs appear to be unarmed; the tibiae have above a coarse and blunt upturned bristle; on the under part, the four anterior tibiæ are armed with 2. 2. long and strong spines; the four anterior metatarsi have 2. 2. 2. such spines on the under part, the last apical pair, however, situated rather on the sides of the joint. The abdomen is somewhat broader than long, truncate in front, gradually dilated backward to behind the middle, then narrowing with rounded sides, and rounded behind; it is thinly spread with spatulate bristles; in front of the mamillæ, the belly is sprinkled with hairs of the ordinary form. The vulva consists of a small Y-shaped depression (the fore margin of the vulva having the form of a triangular lobe) bordered behind by two tubercles, one on each side.

Color.-Cephalothorax blackish-brown, with a longitudinal middle band, which is as broad in front as the clypeus, narrowing backward, and of a pale rusty-brown color, with darker spots on the pars cephalica and a blackish line along the middle of the pars thoracica ; the sides have

also each a paler, irregular, longitudinal band, composed of rusty-brown spots; the extreme lateral margins are of a rusty testaceous hue. Sternum, maxillæ, and labium pale rusty-brown, the maxillæ whitish at the apex; the mandibles dark, with rusty-brown spots. Palpi and legs blackish-brown, pale at the base; the coxæ are of a pale grayish testaceous color, as is also the base of the thighs, especially of the hinder legs, which are rather paler than the two anterior pairs, and in which both tibiæ and metatarsi have a blackish ring near the base. Abdomen grayish.brown above, mottled with black, these black markings forming a large patch occupying the greatest part of the back behind; toward the sides, the abdomen is also strewed with small whitish points; the sides and belly are dusky or sooty gray, the vulva pale, with exception of the two larger lateral tubercles, behind, which are brown. The mamillæ are pale grayish. The hairs and brist les of the body and the extremities are blackish, with exception of the appressed bristles of the cephalothorax, these being rusty-yellow: the long spines on the under part of the fore tibia and metatarsi are pale brownish.

Length of body nearly 4 millim.; length and breadth of cephalothorax 13 millim. ; length of abdomen 21, breadth of same 24 millim. Length of legs : I 4, II nearly 43, III 3, IV 34 millim.; patella + tibia I 14 millim.

Of this species, which is closely allied to the European 0. praticola (C. L. Koch) and others, a single female specimen was captured at Manitou Springs, Colo., July 13.

Gen. DIÆA Thor., 1870. 15. D. lepida n.

Cephalothorax brownish testaceous, with two brownish longitudinal bands toward the sides; area occupied by the central eyes somewhat broader than long, scarcely broader behind than in front; legs testaceous, at least the second pair, with broad brownish-red rings at the apex of tibia, metatarsi, and tarsi; upper part of abdomen pale grayishbrown, whitish toward the sides, with two converging, dentated, reddish-black bands on its posterior half; tibial joint of the male's palpi broader than long, oblique, its outer side at the apex drawn out into a forward-directed, pointed process, as long as the joint itself.- ő ad. Length about 23 millim.

Hale.-Cephalothorax fully as broad as long, strongly and equably rounded in the sides of the large pars thoracica, sinuated just under the hind lateral eyes; the pars cephalica broad, its free part very short, rounded in front; the height of the perpendicular clypeus somewhat smaller than the length of the area occupied by the central eyes. The front row of eyes rather slightly curved upward, the hind row more strongly curved backward ; the distance between the two lateral eyes, which are placed on a common low and broad ridge, or long tubercle, is much greater than that between the fore and hind central eyes.

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