SESIA. 147 



Proserpinus. Antennae clavate with minute liook; tongue as long as 

 body ; eyes minute. 



tt Abdomen without apical tuft. 

 Unzela. Antennas rather slender ; tongue moderately long. 



2O Fore wings circularly excavated near the tip and interior angle, 



middle rounded. 

 Thyreus, Group II. Head small, eyes very small; tongue equal to 3d 



abdominal ring. 

 3 Fore wings truncated at the tips. 



f Augulated and denticulated, 

 t Tongue nearly as long as the body. 



Thyreus, Group I. Abdomen with apical tuft ; head broad and obtuse ; 

 eyes small. 



tf Angulated in the middle. 



tt Abdomen with apical tuft. 



Enyo. Antennae sub fusiform, short, with angular hook ; tongue equal to 



3d abdominal ring. 



Perigonia. Antennae slender, setaceous ; tongue rather short ; head ob- 

 tuse ; palpi short. 



ttt Abdomen without apical tuft, or scarcely tufted. 

 Calliomma, Group V. Fore wings with silvery lines (in note). 

 Smerinthus (in part). Tongue about as long as palpi. 

 Dei'damia. Tongue two-thirds as long as body; body fusiform. 



ftf Not angulated in the middle. 

 Perigonia. Group II. 



4 Fore wings denticulated. 



| Without silvery streaks. 

 Smerinthus. Tongue about as long as palpi or almost obsolete. 



ft With silvery streaks and angulated. 

 Calliomma. Group IV. 



SESIA FABR. 



The body is pilose, stout and more or less oval or elliptical in 

 outline, in the 9 , but more elongate and slender in the male. The 

 thorax is advanced and tapers anteriorly to the head, which is 

 small, but free and prominent, with the front broad ; the eyes are 

 very small ; the palpi exceed the front and terminate acutely in a 

 pencil of hairs ; the tongue when unrolled extends to about the 5th 

 abdominal segment; the antenna? are longer than the thorax, slen- 

 der at the base, clavate and furnished with a minute seta at the 

 extremity. The abdomen is tufted at the extremity, and about 



