32 GROTE — SPECIALIZATIOXS OF LEPIDOPTEROUS WIXG. [April 7, 



base as in Eiirycus, than which this form appears more generalized. 

 I do not doubt the validity of the genus. 



(4th Group.) 

 IphicUdes podalirius. 



Compared with Papilio viachaon the veins are more slender and 

 transparent. Veins ivg and ivg on secondaries are nearer together 

 at base. The internal nervure is straight and the margin fuller on 

 hind wings. On primaries the cubital cross-vein is slighter and 

 does not attain vein vii. The discal cross-vein is downwardly 

 curved on hind wings between iii and iv^. The humeral cell is 

 larger than in Papilio. 



By the free first radial branch this genus agrees with Papilio and 

 the other genera of the group. Otherwise it is more nearly con- 

 nected with Pathysa antiphates, and its generic distinction as com- 

 pared with Papilio is beyond question. The straight internal vein 

 of secondaries is a character of generalization as compared with 

 Papilio. 



Jasoniades turmis. 



Agrees very closely with Papilio. The humeral cell is larger, 

 the tail shorter and a little spatulate. The internal vein is curved, 

 as in Papilio, with which it so closely corresponds as to make the 

 propriety of its generic separation doubtful. The two forms appear 

 to belong to the same immediate phylogenetic line. 



Euphoeades troiliis. 



The tail is a little shorter and spatulate ; otherwise this form 

 agrees so exactly with Jasoniades that I find no distinguishing 

 character whatever. Belongs to the same branch and group. 



Heraclides thoas. 



The tail is a little longer than \\\ Jasoniades and spatulate. Vein 

 ivo on secondaries is a little farther from ivg, so that Heraclides is 

 more generalized. Otherwise I find no differences whatever. From 

 Eiiph(Kades I find only the slightly longer tail to distinguish it. 



The separation of the preceding forms, except IphicUdes, from 

 each other and from Papilio seems difficult from the neuration. 

 All have the internal vein of secondaries curved and are evidently 

 very nearly related, belonging to the same phyletic branch of the 

 family. 



