TRANS. ST. LOUIS ACAD. SCIENCE. 



the body becomes somewhat translucent, while the hairs from 

 the papillae become stouter ; and in this condition it has a conchi- 

 liform appearance, and strongly recalls the young Thecla larva, 

 or the young larvae of such Heterocerous genera as Euclea and 

 Adoneta. 



Thus there are two broods each year, but they overlap each 

 other so that a few of the later individuals of the first coexist with 

 the earlier individuals of the second, and the butterflies may be 

 found more or less abundantly from early June till September. 



The larva experiences four molts, so that there are four heads 

 (7,y, k, I) which are shed entire, and a fifth {pi) which is split 

 open by the chrysalis and attached to the last larval skin. Dur- 

 ing the rest preceding each molt the antlers of the new head will 

 be found laid back on the first joint, below the skin. 



The Herse Butterfly (Apatura Herse, Fabr.) 

 IF*. 50 



Apatura Herse— a, eggs: b, larva; c, chrysalis; d, imago ff, the dotted line showing 

 form of 9 — all natural size. 



This butterfly (Figs. 5, d, and 6, //) is at once distinguished 

 from Lycaon by its larger average size, more fulvous color and 

 different ornamentation, especially of the front wings. Aside from 

 the sexual characters already given in speaking of the previous 

 species, the male in Herse is generally brighter colored than the 

 female, with the markings, especially of hind wings, much more 

 clearly defined ; so that, instead of the distinct pattern of hind 

 wing which I have illustrated (Fig. 6, //), the female has the 

 marks more or less obsolete, and the general tint deeper and more 

 uniform. The species extends farther north and east than Lyca- 

 on ; but in the Mississippi Valley and the more southern States 



