GENUS CASTNIA AND SOME ALLIED GROUPS. 205 



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



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



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



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



Genus Megathtmtjs. 



Megathymus , Scudder, Syst. Revis. Amer. Butterflies, p. 12 (Salem, 1873). 



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

 Lepid. Amer. Septentr. pl. 70), under the name of Eudamus'? 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 insuificient description 

 of this insect under the name of Castnia yucccE, which, lie says, " connects the Castni<B 

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

 Leconte and Boisduvars 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. Riley, in the ' Transactions of the Academy of 

 Sciences of St. Louis,' vol. iii. January, 1876, and subsequeutly 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 tliat the insect is a 

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



DESCEIPTION OF THE PLATES. 

 Plate XXVIII. 



Details of Castnia. 



Fig. 1. LaiTa of C. eudesmia. 



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



Fig. 3. Pupa of C. eudesmia, with one of the pterothecse raised up, showiug tlie fore wing aud 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. jyaniscvs the two spines in the middle of the two hiad tibiae are wanting (H, -Sehiiffer, Syst. Eearb. 

 pl. vi. f. 17). 



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