Phylctic l\ira llclism in Metamorf>kic Species. 437 



markably long and curved, and fringing both sides. 

 It may be safely assumed that the intermediate 

 genera would agree in possessing this important 

 character of the Nymphalideous larvae, viz., spines. 



After the genus 90 there are 22 more genera, 

 and these are spineless, at least in the case of the 

 two chief genera, 93, Apatura, and io$,Nympha- 

 lis. Of the remainder I know neither figures nor 

 descriptions.* In the two genera named the larvae 

 are provided with two or more spine-like tentacles 

 on the head, and the last segment ends in a fork- 

 like process directed backwards. The body is 

 otherwise smooth, and differs also in form from 

 that of the larvae of the other Nymphalina:, being 

 thickest in the middle, and tapering anteriorly and 

 posteriorly ; neither is the form cylindrical, but 

 somewhat flattened and slug-shaped. If therefore 

 we were to arrange these butterflies by the larvae 

 instead of by the imagines, these two genera and 

 their allies would form a distinct family, and could 

 not remain associated with the 90 other Nympha- 

 lideous genera. 



We have here a case of incongruence ; the 



[The larvse of the noth genus, . Paphia, Fabr. (Anaa, 

 Hiibn.) are also smoothed-skinned. See Edwards' figure (Joe. 

 at. vol. i. PI. XLVI.) of P. Glycerium. Also C. V. Riley's 

 " Second Annual Report " on the insects of Missouri, 1870, p. 

 125. Burmeister figures the larva of a species of Prepona 

 (genus 99) which is smooth (P. Denwplwn^ loc. fit. PI. V. 

 Fig. i ). The horns on the head of Apatura, &c, may possibly 

 be a survival from a former spiny condition. K.M. ] 



