^^^ [December 



corresponding with those of the tribe, and such, indeed, appears to be 

 the fact, so far as incomplete and sectional investigation will verify it. 

 The Eastern Lepidoptera, as examined by Dr. Horsfield, furnish three 

 sub-typical divisions, all well marked by diiferences in the anteunjij and 

 metamorphoses, and probably in the neuration, but this will require 

 further investio-ation. 



Thus, then, a division or genus of the stirps having Chilognathiform 

 larvae, contains within itself species, which, though the larva be Juli- 

 form, present a certain analogical affinity to the larva of the other four 

 stirpes, while in each of these separate groups the imago manifests a cha- 

 racter which reciprocally confirms the distinct character of these divisions. 



We have already discovered the resewibling forms of the third and 

 fourth stirpes ; perhaps, in collections of greater extent and from more 

 extensive regions, the Vermiform and Anopluriform representatives 

 may be found, and it would not be strange if one or both would be 

 represented by American types. It would be interesting to determine 

 whether this sub-representation of all the stirpes took place in each 

 stirps, and also in its several genera, and, imperfectly, of course, in the 

 species composing these genera. This subject I will discuss more fully 

 in a future paper. 



These analogical divisions form then, very natural sub-genera, into 

 which the present genus Papilio (FapUio, Ornithoptera, Atropha- 

 neurd) may be appropriately divided. 



The sub-generic characters are : — 



" First. Anteanfe, filiform at the base, marked along their entire 

 length, with prominent annular rings, and terminated by a cylindrical 

 club, which is attenuated at both ends." 



'• The larva of this division is characterized by a smooth surface, and 

 by a swelling or intumescence of the fourth or fifth segment of the body, 

 from which it tapers more abruptly to the head, and in a gradual man- 

 ner to the anal extremity." 



This division is exemplified by 



Pap. Memnon. Pap. Polytes. Pap. Machaon. 



" Emalthion. '• Paminon. " Turiius. 



" Aleinoiis. " Demolion. •• Troilus. 



" Polymnester. " Erithoniiis. " Asterias. 



" Heleiius. •• DeiiKjleus. •■ Thoas. 



" Iswara. " Arjuna. •• C'resphontes. 



" Varasi. •' Xuthus. 



and also by their metamorphoses, as far as known. 



