nently toothed, somewhat diffuse. Veins finely marked. Terminal minute dark dots. Fringes fuscous-gray. Hind wings very pale fus. cous, with paler interlined fringes. Beneath fuscous-gray. Body whitish beneath, above fuscous-gray. One male from Illinois (Dr. Nason) has the outer line narrower, more acutely bidentate, and perhaps is a different species; it appears otherwise to agree with the typical male. This species expands 25 mil. The hind wings seem a little paler and more pointed in the male. The Illinois specimen was captured May 26. 1 have examined three females and one male taken by Mr. Charles Fish at Oldtown, Me. HOMEOSOMA Curtis. The male antennæ are suddenly constricted above the base. Labial palpi porrect; maxillary palpi small, scaled. Fore wings with 10 veins; 4 and 5 from a rather long stem; vein 8 wanting. Hind wings with 7 veins; veins 3 and 4 have a separate origin out of the lower angle of the cell; 8 out of 7, a very short furcation before apices. The hind wings differ from those of Dakruma by the origin of veins 3 and 4, which is a separate one; vein 4 from the cross-vein close to 3, whereas in Dakruma 3 and 4 are furcate beyond the closure of the cell. Homeosoma stypticella, fig. 13 (neuration). Fig. 13. 69. . Dusty whitish-gray; wings narrow; a diffuse, blackish, auterior line; discal spot formed of two, blackish, superposed or coalesced dots near the outer line, which is even, oblique, bordered on either side by a blackish shade, the outer of which sometimes wanting and indicated by a costal mark. Hind wings smoky pellucid, with paler fringes. Beneath smoky, immaculate. Average expanse, 19 mil. Three males and ten females examined. Maine, Massachusetts, New York (Lewis County), W. W. Hill. There are probably similar species not yet described, and attention must be paid to the generic characters. Several females in my collection indicate such species, much like stypticella in appearance, but probably generically distinct, a fact which cannot be easily established without reference to the male sex. It somewhat resembles the figure 17 on Plate 2 of the Missouri Reports as that of Pempelia grossularia Packard; but stypticella wants the double band forming the anterior line. It does not agree with the fig ure ou page 140, because the outer line wants the submedian tooth there shown, and the wings are narrower. I regret not to have identified as yet this species of Dr. Packard's, which is probably incorrectly generically referred, and of which no structural characters of value are given by Mr. Riley. ANERASTIA Hübn. Male antennæ a little bent at base, without scale-tuft, ciliate beneath, the joints conspicuous. Ocelli wanting. Labial palpi long, porrected. Fore wings 10-veined; median vein 3-branched, a single vein representing 4 and 5. Hind wings with 7 veins; 3 and 4 furcate on a long stem; 2 before the lower angle of the cell. Tongue present. Anerastia hæmatica Zell., fig. 14 (neuration). Anerastia hæmatica Zell., Verh. Zool.-Bot. Ver. p. 555, 1872. 9. Head and thorax dull yellow, more or less stained with rosy- Fig. 14. There is no doubt on my mind, after examining Packard's type, that it is the same species previously described by Zeller. It appears that Zeller has recognized a second closely allied species from a specimen sent him by Packard, which differs from hæmatica by the thinner, longer, labial palpi, with a brown stripe from the 2d joint outwardly to the tip. The costal stripe is said to be powdered rather thickly with brown. Packard's type does not show any brown powdering, and I cannot recognize any palpal stripe. The palpi are stained with purplish. I do not think it is likely that these characters are specific. My other speci mens show a variation in size and distinctness of the reddish tinge on primaries, but I cannot see either the character pointed out by Zeller or any others on which to infer two species. Of this species, Dr. Packard says in the body of his description :-"It has all the structural characters of Nephopteryx." But in his remarks upon it a little lower down he says:-"Though the antennæ are without the usual tuft of scales, and the palpi are longer than usual, I should judge that it was a Nephopteryx." It is, however, as I have above explained, abundantly distinct from Nephopteryx in structure. It is quite necessary that the structure in this group should be fully reported in describing species. I am prevented from identifying Pem pelia Hammondi with certainty, because the characters of the maxillary palpi and venation are not given by Mr. Riley. In the absence of an examination of the generic characters in this group, any opinion on the validity of "modern genera" must, I think, be without value. The following is a provisional list of our species: ART. XXVIII.-PALEONTOLOGICAL PAPERS NO.6: DESCRIPTIONS OF NEW SPECIES OF INVERTEBRATE FOSSILS FROM THE LARAMIE GROUP. BY C. A. WHITE, M. D. The fossils described in this paper were collected by the writer (unless otherwise stated in connection with the description) from the strata of the Laramie Group, during the season of 1877, in Colorado, Wyoming, and Utah. Many other associated species were also collected, but only the hitherto undescribed forms are noticed in this paper. Of the numerous invertebrate forms hitherto collected from the strata of this great group, except some insect remains (to be described by Mr. S. H. Scudder), and a few unstudied Ostracoid Crustaceans, all are molluscan. CONCHIFERA. Genus VOLSELLA Scopoli. Subgenus BRACHYDONTES Swainson. Volsella (Brachydontes) regularis (n. sp.). Shell arcuate-subovate in marginal outline; valves moderately convex; upper margin more or less strongly arched from beak to rear; thence with a continuous but stronger curve to the postero-basal margin, which is somewhat abruptly rounded to the gently concave base; front moderately narrow, slightly projecting beyond the beaks, and abruptly rounded to the base; beaks depressed, scarcely perceptible as such, and nearly but not quite terminal; hinge-margin short, nearly straight; umbonal slope somewhat prominent, but conspicuous only by increasing the apparent concavity of the basal part of the shell. Surface marked by numerous, rather coarse, radiating lines, or small costæ, which increase in size toward the free margins of the shell. These costæ have generally a somewhat crenulated aspect, due in part to small sinuosities in their course, and in part to being frequently crossed by lines and undulations of growth; denticles or crenulations of the short front margin distinct. Length of the type-specimen 36 millimeters; breadth at the widest part 18 millimeters; but several less perfect examples obtained at different localities indicate a much larger size, the largest of which must have had a length of 63 centimeters. |