352 Mr. A. G. Butler on the 



two species, to which I now have to add a third (lent to 

 me for description by my friend Walter de Rothschild) ; 

 it was obtained by Mr. Veitch's collector, Charles Curtis, 

 at Batchian, and, at Mr. Rothschild's request, I name it 

 C. veitcJiii. 



The characters of the three species of Cocytia can be 

 best indicated by a key thus : — 



a. Wings hyaline-white, with broad black borders and 



thickened black internervular streaks gradually 

 tapering from the external border ; reddish orange 

 subbasal patch on primaries large . . . . C, durvillei. 



b. Wings hyaline-white, with narrow black external 



borders ; internervular streaks nan'ower and 

 emitted abruptly from the external border ; red- 

 dish orange subbasal patch small and rounded . . C. clilorosomn. 



c. Wings hyaline-yellowish, with narrow black external 



borders ; internervular streaks emitted abruptly ; 



reddish orange subbasal patch large . . . . C. veitcliii. 



The following are the species : — 



1. Cocytia durvillei. 



Cocytia durvillei, Boisduval, Mon. Zyg., p. 22, pi. i., 

 fig. 1 (1829); Sp. Gen. Lep., i., pi. 15, fig. 1 

 (1858). 



Male and female, New Guinea ; male, Port Moresby ; 

 female, Ke Dulan ; B. M. 



2. Cocytia chlorosoma. 



Cocytia chlorosoma, Butler, Ann. & Mag. Nat. Hist., 

 ser. 4, vol. 15, p. 144 (1875). 



Male, Aru, B. M. 



We only possess two male examples of this Bpecies. 



3. Cocytia veitcliii, n. s. 



As large as C. durvillei, but the wiugsof a transparent yellowish 

 colour (not duo to scales, as these are absent from the clear por- 

 tions of the wing-surface), the black external herders narrow as in 

 C. chlorosoma, the rays or intermediate streaks being emitted 

 abruptly as in that species, so that tlie inner edge of the external 

 border is not sinuated as in C. durvillei ; primaries with the orange 

 subbasal patch as large as in the latter species, and of a similar 



