THE ENTOMOLOGIST. 39 



b. Limaciformes, in which the larva is shaped like a 



slug and has no spines; the body terminates in 



two pointed processes directed backwards (ex. 



Apatura Iris and A. Ilia, Huhner^ 115, 116, and 



all the Satyridge of Doubleday's list). 



ii. Sacciiicti, in which the pnpse are attached by the 



tail, and are also supported by a belt of silk round 



the waist. 



a. Onisciformes, in which the larvae are shaped like 



woodlice, the head being small and retractile, 



and the legs concealed. 

 Ohs. — The Onisciformes of this method are invariably 

 divided by entomologists into two families — Erycinidae, with 

 the fore legs aborted in the males but perfect in the females; 

 and Lycaenidae, in which all the legs are perfect in both 

 sexes. The late lamented Edward Doubleday has, however, 

 very clearly shown that this character is by no means 

 absolutely distinctive, the males of several of the true genus 

 Lycaena having very imperfect fore legs. The pretty little 

 English butterfly commonly known as the Duke of Burgundy 

 Fritillary is now generally placed in the family Erycinidae ; 

 but a comparison of the tarsal claws of the male with those 

 of some males of the genus Lycsena make it doubtful whether 

 this separation of Nemeobius (or more properly Hamearis) 

 can be maintained. 



b. Cylindracei, in which the larvae are cylindrical and 



naked (ex. Papilionidae, Pieridae and Rhodoceridae 



of Doubleday 's List; also the following European 



species : — Cerisyi, Hubner, 890 ; Polyxena, 



H'dhner, 392, 393 ; Cassandra, Hubner, 910 — 



913 ; Demnosia, Freyer, t. 7, fig. 2 ; Rumina, 



Hubner, 633, 634 ; and Medesicaste, ///. Magaz.) 



Obs. — -These species constitute the European genus Thais, 



all the larvae of which feed on the species of Aristolochia 



(birthvvort) : they are very peculiar insects, and are supposed 



by some authors to be closely allied to the genus Doritis, 



which here follows next in succession. It should also be 



mentioned that Rambur, in the ' Annales de la Societe Ento- 



niologique de France' (1836, p. 576), describes the pupa of 



Pontia Eupheme as enclosed in a tough silken cocoon, 



pointing out a still closer alliance at this point between the 



two primary divisions. 



