Catalogue of Noj^th American Sphinges. 287 



Genus Yl. — Deilephila, 



Wings entire, upper ones acute. Antennae rather short, straight, gradually thick- 

 ening nearly to the end, which suddenly terminates in a small and short hook; 

 in the males transversely biciliated beneath. Tongue moderate. Abdomen con- 

 ical, pointed, and transversely banded at the sides. Larva elongated, not tapering 

 before, and the head and first three segments not retractile, with a series of nine or 

 ten round spots on each side, and a long caudal horn ; transforms in the earth. 



Family II. — Macroglossiadse. 



Antennas fusiform, prismatic, ending with a hook, and transversely biciliated 

 beneath in the males. Palpi pressed close to the face, with the third joint minute 

 and concealed ; short, thick, and obtuse at the end in some ; slightly elongated 

 and subacute in others. Body short and thick, or flattened a little; abdomen tufted 

 at the end. Flight diurnal. Larvse colored, naked, with a caudal horn, which is 

 sometimes obsolete and replaced by a callous spot; they devour the leaves of 

 plants, and enter the earth to transform, or conceal themselves upon the surface in 

 an imperfect cocoon under leaves. 



In this family we have three genera, Pterogon, Thyreus, and Sesia. 



Genus VII. — Pterogon. 



Wings angulated and indented. Antenna? long, arcuated, tapering at the end, 



with a long, terminal hook. Tongue as long as the body. Abdomen short 



and conical. Larvae attenuated before, with a scries of spots, on each side, sloping 

 obliquely backwards and downwards, and a caudal horn, which is frequently ob- 

 solete and replaced by a callous spot : they transform in an imperfect cocoon un- 

 der leaves. 



Genus VIII. — Thyreus. 



Wings angulated and indented. Antennae long, and ending with a long hook. 

 Palpi short, thick, and obtuse at the end. Tongue moderate. Abdomen ovoid. 

 Larvae elongated, not attenuated before, longitudinally striped on the back, 

 obliquely banded at the sides, with a long and straight caudal horn : they trans- 

 form in the earth. 



Genus IX. — Sesia. 



Wings entire, upper ones acute, all of them transparent in the middle. An- 

 tennae short, straight, gradually thickened towards the end, with the terminal 

 hook obsolete, and obliquely biciliated beneath in the males. Palpi somewhat 

 elongated, subacute, and forming a conical beak. Tongue long. Abdomen short 

 ovoid, slightly flattened. Larvae not attenuated before, longitudinally striped on 

 the back, with a short, slightly recurved caudal horn : they transform in an imper- 

 fect cocoon under leaves on the surface of the ground. 



Family III. — ^geriadas. 



Antennae arcuated ; either thickening to beyond' the middle, attenuated and 

 curved but not hooked at the end, and biciliated beneath in the males ; or veiy 

 slightly fusiform and almost threadlike, and simple in both sexes. Palpi elonga- 

 ted, slender, distinctly three-jointed, prominent, separated and not pressed close to 

 the head, nearly cylindrical, covered with very small scales and almost naked ex- 



