SESI'A. 147 



Proserpinus. — Antennae clavate with, minute hook; tongue as long as 

 body; eyes minute. 



XX Abdomen without apical tuft. 

 Unzela. — Antennae rather slender ; tongue moderately long. 



20 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 Angulated and denticulated. 

 X Tongue nearly as long as the body. 

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

 eyes small. 



ff Angulated in the middle. 



XX Abdomen with apical tuft. 



Enyo. — Antennse subfusiform, short, with angular hook ; tongue equal to 



3d abdominal ring. 

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

 * tuse ; palpi short. 



XXX 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. 

 De'idamia. — Tongue two-thirds as long as body; body fusiform. 



ftf Not angulated in the middle. 

 Perigonia. — Group II. 



40 Fore wings denticulated. 



f Without silvery streaks. 

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



ff 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 antennse 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 



