70 Mr. A. G. Butler 07i Papilio Cocytus. 



XI, — Remarks upon the Papilio Cocytus of Fabricius and its 



distinctness from the Adolias Cocytus of Authors. By A. G. 



Butler, F.'Z.S. 

 In the fifth volume of the ' Zoological Journal,' pp. 67, 68 

 (1835), Dr. Horsfield has noticed tlie distinctness of the Go- 

 cyta of Fabricius's ' Entomologia Systematica ' from the Co- 

 cytus of his ^ Mantissa ; ' he moreover figures a species, appa- 

 rently identical with the former, under the more distinctive 

 name of Gocytina^ . It is unfortunate that he should not have 

 figured an East-Indian example, as the Sumatran form now 

 proves to be a distinct species. 



I find, by referring to the ^ Genera of Diurnal Lepidoptera,' 

 p. 291. no. 9 (1850), that Adolias Cocytus is stated to be in 

 the collection of the British Museum from North India f, — a 

 species which in some points agrees with the typical descrip- 

 tion being mistaken for that insect. Mr. Moore, in his mono- 

 graph oi Adolias (Trans. Ent. Soc. vol. v. p. 76. n. 28: 1859), 

 evidently intends the same species, which he quotes as from 

 North and South India. 



On referring to the type of P. Cocytus in the Banksian col- 

 lection, I find that it is totally distinct from the above-men- 

 tioned species. It is a good deal faded ; but the pale band of 

 the hind wings still shows a bluish tinge towards the apex, and 

 in the right-hand wing, which lies behind the fore wing, and has 

 consequently had more protection, there is a distinct flush of 

 bluish violet, indicating that the original colour of the band 

 was blue, and not ash-coloured as stated by Fabricius. The 

 underside of the wings is entirely ochreous, with a submarginal 

 lunulate interrupted band, very indistinct in the hind wings 

 (" striga postica fusca^'' Fabr.), the apex of the fore wings also 

 being tipped with dark fuscous; the fore-wing cell has the usual 

 lituras ; but in the hind wings they are scarcely indicated. 

 Fabricius describes the underside of the wings as " omnes 

 cinerascentes ; " but there is now no indication of such colora- 

 tion in the type ; and I think, considering the careless manner 

 in which many of the Fabrician descriptions were put together, 

 that it is exceedingly likely that this is an error. 



We have a specimen of a species from Assam, and a second 

 without a locality, which only differ from the type in having 

 the apex of the fore wing slightly less falcate, the blue mar- 

 ginal band rather narrower, and the underside of the fore wing 

 with a violet nebulous streak along its outer margin : there 



* Vollenhoveu lias figured a species near Cocytina from Java (Tijd- 

 schrift voor Eiitomologie, vol. v. pi. 12. figs. 3, 4) under the name of 

 Bhimei. 



t The original locality (Siam) is also quoted. 



