134 ILLINOIS BIOLOGICAL MONOGRAPHS [134 



aa. Scoli often wanting, when present ten times as long on mesothorax 

 as on abdominal segments 1, 3, 5 or 6. 

 b. Mesothorax bearing seoli about as long as body is wide. 



Nymphalinae 

 bb. Mesothorax without scoli. Apaturinae 



Genera of Argynninae : 



a. Abdominal scoli over half as long as segments. 



b. Subdorsal prothoracic scoli twice as long as those of abdomen, 

 clavate; head bigibbous, rounded. Euptoicta 



bb. Subdorsal prothoracic scoli smaller than those of abdomen, not 

 clavate. 

 c. Head armed above with long scoli or short, pointed prominences ; 

 abdominal scoli not longer than those of thorax, 

 d. Scoli of head long, spine-like ; subdorsal pair of prothorax 

 rudimentary. Agraulis 



dd. Scoli of head short, not spine-like ; subdorsal pair of protho- 

 rax about as long as those of abdomen. Argynnis 

 cc. Head rounded above, bigibbous, not armed with scoli or pointed 

 prominences ; abdominal scoli longer than those of thorax. 



Spcycria 

 aa. Abdominal scoli less than half as long as segments ; head rounded, 

 bigibbous; prothoracic scoli sometimes long. Brenthis 



Genera of Melitaeinae: 



a. Subspiracular scoli present on all three thoracic segments. 



b. Mediodorsal scoli light in color, others black ; body with numerous 



slender secondary setae. L> monias 



bb. Mediodorsal scoli black, like the others; body with stout, sparse 



secondary setae. Euphydryas 



aa. Subspiracidar scolus present on mesothorax but absent or reduced 



to a single seta on metathorax. 



b. Dorsal scoli stout, sometimes verruca-like, about twice as high as 



broad. Phyciodes 



bb. Dorsal scoli slender, at least three times as high as broad. 



c. Dorsal abdominal scoli not as long as segments, subequal in 

 length to those of metathorax. 

 d. Dorsal scoli of mesothorax and metathorax subequal in size ; 

 body striped, not spotted, 

 e. Supraspiracular scolus of segment 8 dorsad and only 

 slightly cephalad of spiracle ; body with conspicuous trans- 

 verse stripes. Cinclidia 

 ee. Supraspiracular scolus of segment 8 cephalad of top of 



