120 



bb. Dorsal surface of abdomen not flattened ; body tapering at caudal 

 end ; color yellowish or chestnut-brown, strikingly marked with 

 black. 



c. Distinct cremaster present Haploa Hiibner. 



cc. Distinct cremaster never present. 

 d. Antennae about seven eighths the length of the wings ; maxillae 

 never reaching the caudal margin of the wings. 



Uietlieisa Hiibner. 

 dd. Antennae as long as the wings ; maxillae always reaching the 



caudal margin of the wings Ctenuclia Kirby. 



aa. Abdominal segments 5-7 with a flanged plate along the cephalic 

 margin, and with deep furrows between the movable segments 

 when the body is retracted ; maxillae never as long as the wings, 

 usually about two thirds the length; mesothoracic wings always 

 meeting on the meson eaudad of the appendages. 

 b. Abdominal segments 4-6 with a similar flanged plate adjacent to 

 the caudal margin of the segment. 

 c. Appendages, and usually the thorax, roughened with indetermi- 

 nate transverse striations ; abdominal segments densely, coarsely 

 punctate, 

 d. Head with a small tubercle at the proximal end of each an- 

 tenna; antennae always much shorter than the prothoracic 



legs Estigmene Hiibner. 



dd. Head without a tubercle at the proximal end of each antenna ; 

 antennae as long as, or longer than, the prothoracic legs, 

 e. Body usually 18-20 mm. in length, stout ; setae of the cre- 

 master of various sizes and lengths, the shortest ones only 

 about half the length of the longest, and irregularly ar- 

 ranged, always fifteen or more in number. 



Diacrisia Hiibner. 



ee. Body seldom over 12 mm. in length, varying from 10-15 



mm., rather slender; setae of the cremaster of practically 



the same size and length, arranged in two transverse rows, 



with four in the dorsal and eight in the ventral row, never 



as many as fifteen in number Hypliantria Harris. 



cc. Thorax and appendages smooth and polished; body sparsely, 



finely punctate Ecpantlieria Hiibner. 



bb. Abdominal segments 4-6 never with a flanged plate adjacent to 

 the caudal margin, 

 c. Distinct cremaster always present and long, bearing setae at the 

 caudal end; antennae about equaling the maxillae in length, 

 usually three fourths the length of the wings. 



Apantesis Walker, 

 cc. Distinct cremaster never present ; a row of setae at the caudal 

 end of the body ; antennae very much shorter than the max- 

 illae, being about half the length of the wings. . . .Isia "Walker. 



