480 Mr. L. de NiceVille on the 



The key to the species given below will enable anyone to 

 easily recognize the various species. 



A. Of larger size; hind wing angulated, with a well-developed ' tail' at 



the termination of the third median nervule. 



a. Hind wing with no marginal orange mixed with black line. 



a'. Fore wing on both sides with a large apical patch, black above, 

 orange below. 



1. D. Verhuelli, van der Hoeven : N.E, Himalayas, Assam, Upper 



Burma, Southern China. 



b'. Fore wing on both sides with no large apical patch. 



2. D. Skertchlyi, sp. n. : Southern China (Hongkong). 



b. Hind wing with a marginal orange mixed with black line. 



3. D. gobrias, Hewitson : Malay Peninsula, Sumatra, Java, Borneo. 



B. Of smaller size ; hind wing rounded, without a ' tail.' 



a. Fore wing with a large round black spot in the middle of the second 



median interspace. 



4. D. Wallichii, Doubleday : Sikkim, Khasi and Naga Hills, 



Assam. 



b. Fore wing with no large round black spot in the middle of the 



second median interspace. 

 a. Fore wing on the upperside with no apical and discal orange 

 markings. 



5. D. decipiens, sp. n. : Khasi Hills. 



b' . Fore wing on the upperside with the internal area of the apical 

 black patch and a discal oblique fascia rich orange. 



6. D. difformis, sp. n. : Western and Central China. 



1. Dercas Verhuelli) van der Hoeven. 



Colias Verhuelli, van der Hoeven*, Tijdsch. voorNat. Gesch. en Phys. 

 vol. v. p. 341. n. 3, pi. vii. figs. .*! a, 3 b, female (1839). Dercas Ver- 

 huelli, Moore, Froc. Zool. Soc. Lend. 1865, p. 760 : id., Elwes, Trans. 

 Ent. Soc. Lond. 1888, p. 414. n. 372. Gonepteryx Verhuellii [sic !], 

 Doubleday & Hewitson, (Jen. Dinrn. Lep. vol. i. p. 71. n. 8, pi. viii. 

 fig. 3, male (1847). Dercas Verhuellii, Wallace, Trans. Eat. Soc. 

 Lond. ser. 3, vol. iv. p. 398. n. 2 ( 1867) ; id., Butler, Cist. Ent. vol. i. 

 pp. 3(3, 4o, pi. ii. fig. 1, male (1870); id., Butler, Ann. & Mag. Xat. 

 Hist. ser. 5, vol. xvi. p. 338. n. 83 (1885) ; id., Staudinger, Ex. Schmett. 

 vol. i. p. 40, pi. xxii., male (1884-85) ; id., Schatz, Ex. Schmett. 

 vol. ii. p. 68, pi. vii., male, palpus, and antenna (1886) ; id., Swinhoe, 

 Trans. Ent. Soc. Lond 1893, p. 308. n 343 ; id., de Niceville, Gazet- 

 teer of Sikhim, p. 167. n. 431 (1894); id., Watson, Journ. Bomb. 

 Nat. Hist. Soc. vol. x. p. 671. n. 231 (1897) ; id., Adamson, Cat, Butt. 

 Burmah, p. 42. n. 348 (1897). 



Hab. China (van der Hoeven) ; Bengal (Moore) ; not un- 

 common in certain places in Sikkim up to 4000 feet from May 

 to October (Elwes) ; China, N. India (Doubleday) ; N. India, 

 Silhet ( Wallace) ; Manipur, one pair (Butler) ; North India, 



* Several writers — Staudinger, Schatz, Adamson, &c. — have attributed 

 this species erroneously to Hewitson. 



