130 ILLINOIS BIOLOGICAL MONOGRAPHS [130 



absence of material it is impossible to be sure that the prolegs and cro- 

 chets are of the peculiar form seen in Lycaenidae. 



Family Libytheidae 



American larvae of this family are not known to me, but the follow- 

 ing characters, for which Edwards is the authority, are duplicated in 

 Libythea ccltis of Europe. 



Hypatus bachmani. Body cylindrical, somewhat thickened in re- 

 gion of last two thoracic segments; dorsum of last two abdominal seg- 

 ments curved abruptly ventrad; each segment divided into four or five 

 annulets ; numerous secondary setae present, a group at the base of each 

 leg and one on the first annulet of each segment, borne on chalazae. 



In addition, L. celtis has the head covered with secondary setae, 

 the second, third, and fourth ocelli on papillae, the other ocelli reduced, 

 and the crochets arranged in a pseudocircle. The labrum is shallowly 

 concave at tip. The general structure and habits are similar to those 

 of the Pieridae, but the presence of the lateral rudimentary crochets of 

 the pseudocircle will distinguish them. 



The larva of Hypatus carinenta seems to be unknown. 



Family Lymnadidae 



Head about as large as prothorax, bilobed ; labrum with a rounded 

 emargination. Body bearing fleshy filaments in the subdorsal region 

 (Fig. 92), at least on the mesothorax ; not more than three pairs of these 

 processes present in American species; coloration always consisting of 

 transverse black and green stripes. 



Anosia plcxippus bears a pair of these filaments on the mesothorax 

 and another pair on the eighth abdominal segment. There are three 

 transverse black stripes on each segment. A. bercnice bears filaments 

 on the mesothorax and the second and eighth abdominal segments. The 

 middle of each segment bears a wide double broken black band reaching 

 over the dorsum to the end of each proleg. 



Lycorea clcobaea is the only species of Lycorea north of Mexico. 

 No specimens of the larvae are in the National Museum ; but a related 

 species, L. atcrgatis of southern Mexico, has fleshy filaments on the 

 mesothorax only, and the black color on the abdomen covers the venter 

 and the intersegmental incisions. 



Family Ithomiidae 



The larvae of the three North American species of these Nymphal- 

 oidea seem to be unknown. Wilhelm Miiller (1886) describes in a brief 

 way other species of the same genera but gives no very definite structu- 

 ral data. The only distinguishing characters mentioned are arrange- 



