1899.] GROTE — SPECIALIZATIONS OF LEPIDOPTEROUS WING. 27 



4. Internal vein of hind wings reaching to anal angle, 



internal margin full and rounded 



(6th Group) Ornithoptera. 



From the foregoing table we may extract the following neura- 

 tional diagnoses of the principal genera in the different groups : 



(ist Group.) 



Gen. Leptocircus Swainson, 1832. 



Type : L. curius. 



= La?nproptera Gray, 1832 (preoccupied). 



Vein iii, of primaries arises out of iii^ beyond the cell halfway to 



apex of wing. Cell of hind wings disproportionately small and 



reduced. Hind wings greatly developed inferiorly, with long, 



pointed tail. On primaries the cubital cross-vein does not attain 



vein vii, but is arrested at submedian fold (vein vi). Vein '' ix " of 



primaries present, as everywhere in the Papilionides. 



The neuration of primaries, owing to the advanced position of 

 vein iiig, presents very striking analogies with the Sphingidae, but a 

 relationship with this group is absolutely excluded by the presence 

 of vein '' ix " and absence of viii on fore wings. An habitual resem- 

 blance to Goniloba and other Hesperian genera is offered by the 

 coloration ; this is perfectly contradicted by the neuration which is 

 Papilionid. How great must be the phyletic value of vein " ix," if 

 it persist in this isolated and aberrant form ! In none of the generic 

 types examined by me do I find any probable indications of the 

 more immediate phylogeny of Leptocircus. 



(2d Group.) 

 Gen. 7^^/^^i- Hlibner, 1816. 

 Type : I. codrus. 

 Vein iiis of primaries arises from the radius more or less exactly 

 opposite the point of junction of the discal cross-vein. The discal 

 cell of secondaries is subequal, but is narrowed outwardly by a 

 downward curve of the cross-vein, between radius (iii) and first 

 branch of media (ivO. Vein iiii of primaries, the first radial 

 branch, anastomoses with vein ii. The cubital cross-vein is degen- 

 erate, narrow, and does not reach vein vii. The hind wings are 

 produced inferiorly, and vein iv, terminates in a short and sharp 

 tail. 



