GENUS CASTNIA AND SOME ALLIED GROUPS. 205 



the hind tibiae *, and which was subsequently formed into a separate genus by Dr. 



Felder, under the name of JEgiale Kollari. The arrangement of its wing-veins (Plate 



XXIX. fig. 25), and, indeed, the whole structure of the insect, are entirely Hesperideous . 



Specimens are in the Hopeian collection at Oxford, presented to me by Mr. Coffin. 



Genus Megathymtjs. 

 Megathymus, Scudder, Syst. Revis. Amer. Butterflies, p. 12 (Salem, 1872). 



The type of this genus is the large butterfly figured by Boisduval and Leconte (Iconogr. 

 Lepid. Amer. Septentr. pi. 70), under the name of Uludamus? yuccce, by whom also the 

 larva and pupa were represented, but in an unsatisfactory manner. 



Walker, List Lep. Het. B. M. pt. 7, p. 1583, gave a short and very insufficient description 

 of this insect under the name of Castillo, yuccce, which, he says, " connects the Castnice 

 with the Hesperice. Had he been aware of the figures of the preparatory states given in 

 Leconte and Boisduval's work, he would have seen that in all respects (and most especially 

 in the larva form) this is a true Hesperian. In its wing-veins it agrees with JEgiale 

 Kollari, except that the angulated vein closing the discoidal cell is very slender. 



Since the present memoir was presented to the Linnean Society, an admirable memoir 

 on this insect, with figures of its various characters in the preparatory and perfect states, 

 has been published by Dr. Charles V. Biley, in the ' Transactions of the Academy of 

 Sciences of St. Louis,' vol. iii. January, 1876, and subsequently introduced into the 

 ' Eighth Annual Report on the Noxious, Beneficial, and other Insects of the State of 

 Missouri,' by the same author, who has arrived at the opinion that the insect is a 

 large-bodied Hesperian, and that it has no real relation with Castnia. 



DESCRIPTION OE THE PLATES. 



Plate XXVIII. 



Details of Castnia. 

 Fig. 1. Larva of C. eudesmia. 

 Fig. 2. Pupa of C. eudesmia, dorsal view. 



Fig. 3. Pupa of C. eudesmia, with one of the pterotheese raised up, showing the fore wing and its marks. 

 Fig. 4. Cocoon of C. eudesmia. 



Fig. 5. Venation of fore and hind wings of C. papilionaris . 

 Fig. 6. Venation of fore wing of C. cacica. 

 Fig. 6 a. Venation of hind wing of.C cacica. 



Fig. 7. Characteristic portion of the veins of fore wing of C. mygdon. 

 Fig. 8. „ „ „ of C. Boisduvallii. 



* In'H. paniscvs the two spines in the middle of the two hind tibiae are wanting (IL-Schaffer, Syst. Uearb. 

 pi. vi. f. 17). 



2 E 2 



