FAMILY 7A T G^NID^E. 47 



The squamation is fine and powdery. Compared with Lyco- 

 morpha, to which it is nearest' allied, besides the very different 

 style of coloration, the primaries are narrower, costa straighter; 

 secondaries more triangular, owing to the rectangular inner an- 

 gle. But in the structure of the head, of the antennas, of the 

 thorax and abdomen it agrees closely with Lycomorpha, and 

 these characters are those which place it without doubt in the 

 Zygasnidas, though after a casual glance one would not hesitate 

 to call it a Lithosian. The bluish scales of the body, the- dark 

 mahogany colored tegument, the fine powdery squamation, and 

 the slender very equally jointed legs and pectinated antennas aid 

 in determining the true systematic position of this interesting 

 genus. 



From the resemblance to the parallel genera Hypoprepia 

 and Atolmis, among the Lithosiidaa, I have proposed the name 

 above given. . 



A. Grotei nov. sp. Vermillion red and smoky purple ; head 

 and appendages purple , thorax red; primaries red throughout 

 except the purple fringe and the edge of the outer third of the 

 costa. Secondaries red on the basal third, beyond smoky pur- 

 ple ; the red extends from just within the middle of the inner 

 edge to near the apex upon the costal edge. Legs purple, con- 

 colorous with the abdomen. Beneath colored the same as above. 

 There are no other markings on the wings. 



Length, .38 ; exp. wings, 1.20 inch. 



Pike's Peak, Colorado Terr. (Coll. Phil. Ent. Soc.) 



Dedicated to Mr. A. R. GROTE, to whose kindness in secur- 

 ing for study this and many other rarities I am under special 

 obligations. 



EXPLANATION OF THE PLATES. 



PL\TE I. Fig. 1. Ctenucha virginica Grote. la, Palpus enlarged. 

 16, Head denuded and enlarged. Ic, Primary wing. Id, Secondary wing. 



Fig. 2. Larva seen from above. 2a, side view. 2c, front view of head 

 enlarged. 2d, last abdominal ring seen from above. 



Fig. 3. Young larva, after the fourth moult. 



Fig. 4. Pupa seen from above. 4a, side view. 



PLATE II. Fig. 1. Jllypia octomaculata Hubner, head denuded and 

 enlarged, la, Primary wing. 16. Secondary wing. 



Fig. 2. Pupa of Eudryas grata Boisduval. 2a, dorsal view. 



Fig. 3. Head of the same, denuded and enlarged. 3a, Primary wing. 

 36, Secondary wing. 



Fig. 4. Lycomorpha Pholus Harris, head denuded and enlarged. 4a, 

 Primary wing. 46, Secondary wing. 



