230 A Classification of Lepidopterous Larvae. 



Artace punctistriga Walker. 



The arrangement is the same. The larvae which Dr. Packard 

 has kindly loaned to nie are very small and the structure is difficult 

 to make out. 



Heteropacha rileyana Harvey. 



A slight hump on the 8th abdominal segment like a small fleshy 

 horn. Xo tubercles, except on the prothoracic segment where there 

 are traces of three on each side. 



Phyllodesma americana Harris. 



There are no tubercles. There is a dorsal prominence on 8th 

 segment, and the subventral region is hairy. 



The Second Division (corresponding partially to the Frenulum 



Losers of Comstock). 



This division shows the most varied forms of modification, which 

 would require too much space to describe in detail. We see ex- 

 hibited nearly all the higher modifications of the tubercles previ- 

 ously described, and in addition certain new ones. These have 

 been already referred to. There is one set of characters which we 

 do not find largely developed in any family of the Frenulum losers. 

 This is the great development of hairs illustrated by the Arctiidse 

 and allies. 



In the present division the feet are not modified. I know of no 

 instance in which they have departed from the primitive type or 

 been modified for any other purpose than their natural one. There 

 are, however, several instances of highly modified eversible glands. 

 These structures are met with in various families throughout the 

 Frenatse ; but, as they are clearly not the homologues of tubercles, 

 it is not within the scope of this paper to enter into a discussion of 

 them. 



Family Lycaenidae. 



Judging from W. H. Edwards's figures,' the structure of the 

 tubercles is essentially that of the highest Microlepidoptera and of 

 the Lithosiidae (genus Nola). I have, at present, no evidence show- 

 ing from which type it has been derived. Mr. p]d wards figures 

 Lemonias nais as a very hairy larva with apparently three rows of 



1 Butterflies of N. A., vol. II. 



