ACOSMERYX. 291 



Key to the Species. 



Imagines. 



1. Fore wing upperside, grey submargirial line [p. 291. 



or band straight, extending to SM 2 A. naga (Moore), 



Fore wing upperside, grey submarginal line 

 or band curved, ending at R 3 or a little 

 beyond 2. 



2. Fore and hind wing distinctly dentate 3. 



Fore and hind wing not dentate 4. 



3. First discal line of fore wing straight from [p. 297. 



R 3 to SM 3 , heavy A. s. sericeus (Walk.), 



First discal line of fore wing thin, inter- [Jord., p. 298. 



rupted A. omissa, Roths. & 



4. Hind wing underside almost entirely 



ferruginous-tawny or vinaceous ; fore 



wing upperside tawny-cinnamon to [Roths. & Jord., p. 294. 



chestnut-brown A. anceus subdentata 



Hind wing underside much shaded with 

 olive-grey, ground-colour of fore wing [p. 295. 



upperside greyish-olive A. socrates Boisd., 



Larvse. 



1. The subspiracular stripe on segments 2, 3 



and 4 encircling spiracle on segment 5 ; 

 a round plum-coloured spot surrounded 

 by yellow on front margin of segments [p. 296. 



5 to 11 A. socrates Boisd., 



Subspiracular stripe not encircling spiracle 

 on segment 5 ; no such spots 2. [p. 295. 



2. Spiracles white, central slit black as in [Roths. & Jord., 



socrates A. anceus subdentata 



Spiracles orange, central slit black A. naga (Moore), p. 292. 



The pupae resemble each other very closely ; in naga the 

 cremaster is longer than in the other two species of which the 

 pupa is known. 



90. Acosmeryx naga (Moore). (Fig. 74 A, B, genitalia ; fig. 

 75, imago ; PL IV, fig. 1, larva ; PL XIV, fig. 14, larva ; 

 PL IV, fig. 2, pupa). 



Philampelus naga, Moore, 1857, p. 271 (Darjeeling) ; id., 1865, 



p. 794 (Bengal). 

 Acosmeryx naga, Cotes & Swinhoe, 1887, p. 9 (Sikkim ; Simla) ; 



Hampson, 1892, p. 83 ; Dudgeon, 1898, p. 409 (Sikkim, 3,000 ft.) ; 



Roths. & Jord., 1903, p. 529; Jordan, 1911, p. 251, t. 39 c; 



Mell, 1922, p. 225, pi. vii, figs. 13, 17, 18, 35, pi. xviii, 



figs. 5. 6 (pupa), pi. xxvii, fig. 13 (larva), pi. xxviii, fig. 8 ($); 



Seitz, 1929, p. 550. 



Imago. — ^$. The most conspicuously marked species of 

 the genus, easily distinguished from ail others by the pattern 

 of fore wing ; brown discal band extending from costa towards 

 middle of distal margin, sharply defined in front, the tri- 

 angular area limited there by grey ; a rather sharply defined 



