132 ILLINOIS BIOLOGICAL MONOGRAPHS [132 



Head as large as, or larger than, prothorax, which usually forms a 

 constricted neck; surface rugose or tuberculated ; shape varying from 

 rounded above to bilobed or horned ; labrum usually deeply emarginate ; 

 ocelli in most or all species with the third ocellus borne on an elevated 

 tubercle and very much larger than the others. Body with numerous, 

 well developed, lenticle-like papillae bearing small secondary setae ; seg- 

 ments divided into annulets usually six in number; suranal plate bifur- 

 cate, bearing a pair of very rugose conical projections (Fig. 84). Pro- 

 legs bearing a mesoseries of uniordinal, biordinal, or triordinal crochets. 



Genera of Agapetidae : 



a. Head rounded above, not bearing conspicuous scoli, not with latero- 

 dorsal angles, 

 b. Caudal processes widely separated, as far apart as long, parallel 

 (Fig. 84). Cercyonis 



bb. Caudal processes almost contiguous at base, divergent. 



c. Mediodorsal and lateral stripes conspicuous. Oeneis 



cc. Mediodorsal and lateral stripes indistinct. Coenonympha 



aa. Head bearing a pair of conspicuous dorsal prominences, sometimes 

 reduced to sharp laterodorsal angles. 

 b. Dorsal prominence about as long as head is wide. 



c. Head, including prominences, about once and a half as high as 

 wide. Enodia 



ec. Head, including prominences, about twice as high as wide. 



Satyrodes 

 bb. Dorsal prominences reduced to low knobs. 



c. Larger papillae of head few and sparse. Neonympha 



cc. Larger papillae of head closely placed. Cissia 



The discussion and key are based on the following species; those 

 not seen by the writer but described by Scudder are marked with an 

 asterisk (*) : 



Cercyonis meadii, C. alope* 

 Oeneis chryxus, 0. jiitta* 0. noma 

 Coenonympha typhon, C. elko 

 Enodia portlandia 

 Satyrodes canthus* 

 Neonympha phocion* 

 Cissia eurytus* C. sosyhius* 



Family Nymphalidae 



Even when limited by the removal of the other Nymphaloidea, this 

 family is a large and varied group. Scudder divides it into five tribes 

 which are distinct in all stages; and these tribes are retained here as 



