Catalogue of North American Sphinges. 315 



Family V. ZYGJENIAD^. H. The Zygcenians. 



Zygmnidce. Stephens. Zygmides. Boisd. 

 Hitherto I have not met with any insects in the United States 

 belonging to this family ; but Dr. Hornbeck has sent to me, from 

 St. Thomas, a species which not only seems to be undescribed, 

 but must constitute a new genus, the characters of which are 

 given in the Synopsis, and those of the species in the note below.* 



Family YI. GLAUCOPIDID^. H. The Glaucopidians. 



Procrides and Zygenides. Boisd. Zygceniadce. H. Cat. Cte- 

 nuchidce. Kirby. Callimorphce. Westwood. 



Genus XV. Procris. F. 



Ino. Leach. 



P. Americana. = Aglaope Americana 7 Boisd. = dispar. 

 H. (Cat.) 



Blue-black ; with a saffron-colored collar, and a fan-shaped, 

 somewhat bilobed, black caudal tuft. Expands from ten lines to 

 one inch. Larva, according to Prof. Hentz, hairy, green, with 

 black bands. It is gregarious, and devours the leaves of the 

 grape-vine, and undergoes its transformations in an oblong-oval, 

 tough, whitish cocoon, which is fastened to a leaf. 



* Genus XIV. Mastigocera. H. 



From fidcFTi^, a whip or thong, and iciga, horns ; the antennae being thickened 

 in the middle and tapering at each end like a whip lash. In the West Indian 

 insect to which I have applied this name, the antennae agree, in the main, with 

 those, o? JEgocera, as described by Latreille and other authors; but most of its 

 other characters disagree, and it has an entirely different form from that of the 

 type of the genus. These characters are so very striking, that I have ventured to 

 propose this new genus, although the transformations of the species are unknown 

 to me. 



M. vespina. H. 



Light rust-brown ; wings immaculate ; collar, first abdominal segments above, 

 third below, and a triangular spot on each side, white ; head, thickened part of 

 the antennae, edge of the thorax behind the collar, and a large triangular spot on 

 each side of the second abdominal segment, black; breast black, spotted with 

 white; first and second pairs of thighs, except at base, middle of the hind-pair, 

 and extremity of the tibiae, black. Expands from one and a half to one inch and 

 three quarters. Inhabits the island of St. Thomas, W. I. 



The Zijgana Eunolphus of Fabricius, and the Pretv.s of Cramer are probably 

 congenerical and closely allied to this species. 



