116 ILLINOIS BIOLOGICAL MONOGRAPHS [116 



g^. Verrucae kappa of middle abdominal segments well 

 below level of spiracle, 

 h. All abdominal verrucae below level of beta pale, ver- 

 rucae beta black; body marked with longitudinal 

 stripes. Hyphantria 



hh. All abdominal verrucae black ; setae of verrucae rho 

 sometimes forming pencils ; no stripes. Euhaphe 



ff. Verrucae alpha of abdomen about the same size as ver- 

 rucae beta; when distinctly smaller, segments 8 and 9 

 bear setae about three times as long as those of other 

 segments, 

 g. Segments 1, 2, and 7 bearing two verrucae at the same 

 level in line with verruca mu of segments 3 to 6 ; 

 setae short ; body longitudinally striped. Haploa 



gg. Segments 1, 2, and 7 bearing only one verruca in line 

 with verruca mu of segments 3 to 6. 

 h. Subdorsal setae of segments 8 and 9 three times as 

 long as those of any other segments ; over twice as 

 long as body is wide. Leptarctia 



hh. Subdorsal setae of segments 8 and 9 usually sub- 

 equal in length to those of other segments, never 

 twice as long as body is wide, 

 i. Labrum very shallowly concave at tip ; verrucae 

 alpha large, bearing black setae ; verrucae beta 

 and rho smaller, with white setae. Euschausia 

 ii. Labrum rather acutely tho not deeply notched at 

 tip ; verrucae alpha and beta not of contrasting 

 colors. 

 j. Verrucae beta of first few abdominal segments 

 nearly directly caudad of alpha ; verrucae low, 

 flat, 

 k. Setae very irregular in length, some as long as 

 body is wide. Hyphoraia 



kk. Setae sheared off even, never as long as body 

 is wide. 



I. Setae of thorax black, those of abdomen 



brow^n. Phragmatohia 



II, Setae of thorax and abdomen brown, 



Lerina 

 jj, Verrucae beta of first few abdominal segments 

 more nearly laterad than caudad of alpha ; ver- 

 rucae swollen. 



