LEPIDOPTEROUS INSECTS. 23 



the upper ones, and retains the four in a hori- 

 zontal situation during repose ; the antennae are 

 in the form of an elongated club, those of many 

 males, and sometimes both sexes, pectinated or 

 serrated ; caterpillars being always provided with 

 sixteen feet. 



FAMILY I. HESPERI-SPHINGES, Latreille. 



The antennae are always simple, with a claviform 

 termination, the extremity being hooked, and 

 without a tuft of scales. 



The genera are CORONIS, CASTNIA, and AGARISTUS. 



Genus CASTNIA, Latreille. 



Antennas with a terminal elongated club; palpi 

 subcylindrical, adpressed, not contiguous, fur- 

 nished with short scales, and distinctly three 

 jointed. 



FAMILY II. SPHINGIDES, Latreille. 



The antennae are always terminated by a small 

 scaly tuft in a prismatic club, commencing near 

 the middle of their length ; lower palpi broad, 

 thickly covered with scales; the third joint 

 smaller, and generally indistinct. 



The genera are SMERINTHUS, ACHERONTHIA, SPHINX, 

 and MACROGLOSSUM. 



