LEPTOCIRCUS. 23 



This anomalous genus, place it where we will, interrupts the natural succession of the genera in the family to which 

 it belongs. In the situation in which it is now placed it disturbs the very easy transition from Papilio, through 

 Eurycus, to Parnassius; but its affinities to some of the species of Papilio are so close, that wc cannot, in a linear 

 arrangement, interpose any other form between it and that genus. 



The ncuration of the anterior wings is very remarkable from the apparent bifurcation of the third subcostal nervule ; 

 an appearance due to the union, at their origin, of the third and fourth subcostal nervules. The posterior wings offer 

 an equally striking character, the smallncss of the cell ; to which must be added the singular bend of the third subcostal 

 nervule, which might cause it to be mistaken for a fourth median. This peculiarity, and the structure of the posterior 

 wings in Leucophasia and some other genera, lead me to suspect that this nervule should be considered as cpuite distinct 

 from the subcostal nervules, and analogous to the discoidal nervules of the anterior wings. 



But the most striking anomaly in the genus is the totally different form of the claws in the only two known species, 

 which are simple in the one species as is usual in this family, bifid in the other as is the case in the Pieridse. 



Godart, or perhaps more properly Latreille, misled by the resemblance of this genus to some species of Ervcina, 

 placed it in his genus Erycina near E. Licarsis and E. Chorinams, but its only resemblance is in colouring. 



Of the two known species, one seems confined to the northern parts of India, the other to the islands of the Indian 

 ( ) ■. an, and the southern extremities of the continent. The only specimen of the latter which I have seen from the 

 Indian continent, differs slightly from the specimens from Java, and may prove to be a distinct species. 



LEPTOCIKCUS Swainsan. 



1. L. Cumes E. Doubleday, Zoologist, 111. cum fig. (1843). 



P. Cur. Fab. Ent. Syst. in. i. 28. n. 81. (179'i). 

 Donovan, Ins. of India (1S00-3). 

 N. India. B. M. 



2. L. Meoes E. Doubleday, Zoologist, 111. cum fig. (1843). 



P. Me. Zinken, JVov. Act. Acad. Nat. Cur. xv. lo"l. (1831). 

 Lept. Curius Swaineon, Zool. III. 2d ser. t. 106'. (1833). 



Boisil. Sp. Gen. i. 381. n. 1. (1836). 

 Erycina Cur. Goilt. and Latr. Enc. M. rx., Suppl. 827. n. 5. (1823). 

 Java, Moulinein. B. M. 



January, 1847. 



