115] LEPIDOPTEROUS LARVAE — FRACKER 115 



b. Subdorsal setae of thorax, at least of nietathorax, twice as long as 

 those of middle abdominal segments, usually forming pencils. 

 c. Verrucae rho of segment 8 of abdomen each bearing a long pencil 

 of setae ; other setae of segments 8 and 9 short. Halisidota 



cc. Verrucae rho of segment 8 not bearing longer setae than ver- 

 rucae alpha and beta, 

 d. Body and setae unicolorous, never black. Ammalo 



dd. Body bearing black, white, and orange colored tufts of setae 

 on the abdomen. Exchactias 



bb. Subdorsal setae of thorax subequal in length to those of abdominal 

 segments, 

 c. Labrum notched to at least half its depth. 



d. Each verruca bearing setae of two distinct lengths, the shorter 



sheared off even, the others fewer, twice as long, irregular 



in length. Hemihyalea 



dd. Each verruca bearing setae of only one or of irregular 



lengths. 



e. Cuticula and setae pale ; setae sheared off even ; size small. 



Eitpseudosoma 

 ee. Cuticula and setae very dark, with pale transverse stripes; 

 size very large. Ecpantheria 



cc. Labrum notched to less than half its depth. 



d. Thoracic and caudal abdominal segments bearing setae of a 

 different color from those of proleg-bearing segments. 

 e. Setae of four to six middle abdominal segments brown, those 

 of thorax and caudal abdominal segments black. Isia 



ee. Setae of most of abdomen black, those of thorax and end 

 of abdomen brown. Platyprepia 



dd. Thoracic and caudal abdominal segments not bearing setae 

 of a different color from those of proleg-bearing segments. 

 e. Each abdominal verruca bearing setae of two contrasting 

 colors, white and black ; cuticula unicolorous, without a 

 mediodorsal stripe, 

 f. White setae about twice as long as black. Arctia 



ff. White setae about same length as others. Eetypia 



ee. Each abdominal verruca bearing setae of one color only, 

 except when a bright mediodorsal stripe is present, 

 f. Verrucae alpha of abdomen about one-third the size of 

 verrucae beta ; all verrucae small ; setae of segments 8 

 and 9 not longer than those of other parts of body, 

 g. Verrucae kappa of middle abdominal segments par- 

 tially or entirely above level of lower margin of spira- 

 cle. Apantesis 



