28 GEOTE — SPECIALIZATIONS OF LEPIDOPTEROUS WING. [April 7, 



This term has priority for a well-defined group characterized by 

 the junction of the first radial branch with the subcosta. It is also 

 marked by the downward scoop of the cross-vein between veins iii 

 and ivi on hind wings. The genera Idaides and Zetides are closely 

 allied, and appear merely to differ by the details of specialization 

 of the outer margin of secondaries. Arisbe stands further apart by 

 the rounded, not produced, hinder margin of secondaries. It pos- 

 sibly represents an older form of the group. Pathysa differs by the 

 frail, testaceous veins, as well as by the tailing of the normally 

 proportioned hind wings. In all of these characters, as well as in 

 the striped ornamentation, it recalls Iphiclides, belonging to a 

 different group having vein iiij free to costa. A further character, 

 and one which suggests that Iphiclides presents an intermediary 

 type, is that this latter genus has also the cross-vein of secondaries 

 downwardly curved, between radius and first branch of media on 

 hind wings. The intersection of the radial branches with the sub- 

 costa, which characterizes this group, is paralleled in the Charaxin?e. 

 Nevertheless, I think we cannot regard this common feature as 

 indicating more than an analogy between the Nymphalids and 

 Swallowtails. 



(3d Group.) 



Gen. Eiirycus Boisduval, 1836. 

 Type : E. cressida. 



Vein iiig of primaries arises from the radius at a point more or 

 less exactly opposite that of the junction of the discal cross-vein. 

 The discal cells aresubequal on both wings. Vein iiii of primaries 

 free to costa. Internal vein of hind wings shorter, running out on 

 internal margin before the long excision at anal angle. On prima- 

 ries the cubital cross-vein expires just before vein vii. Humeral 

 cell of secondaries large, subquadrate. Hind wings subovate, with- 

 out tail. 



This group is interpolated in this place on account of the extreme 

 specialization of internal margin of secondaries and the shortening 

 of vein vii. Thus the same tendency is manifested here as in the 

 Parnassiidse, to hollow out the margin and shorten the anal Vein 

 of the hind wings. The group is probably a lateral specialized 

 branch from early forms of the succeeding and more typical group 

 of the family. The genus Fachliopiera Reakirt, 1864, with the 

 type aristolochice^ differs very slightly. I regret not to have been 

 able to examine Blakeia gundlachianus (columbus, grotei). 



