480 Mr. L. de Nicdville on the 



The key to the species given below will enable anyone to 

 easily recognize the various species. 



A. Of larger size ; hind wiDg 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. J^ erAwe/^j, van der Hoeven : N.E, Himalayas, Assam, Upper 



Burma, Southern China. 



V, 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, Kha^i and Naga Hills, 



Assam. 



b. Fore wiug 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. : Kliasi Hills. 



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

 black patch and a discal oblique fa>cia rich orange. 



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



1. Dercas Verhuelli, van der Hoevcn. 



Colias VerhuelK, van der Hoeven*, Tijdsch. voor Nat. Gesch. en Ph3's. 

 vol. V. p. 341. n. 3, pi. vii. figs. 3 «, 'ib, female (1839). Dercas Ver- 

 huelli, Moore, Proc. Zoo). Soc. Lond. 18do, p. 760 ; id., Elwes, Trans. 

 Er.t. Soc. T.ond. 1888, p. 414. n. 372. Goneptoifx VerhueUii [sic !], 

 Doubleday & Hewitson, Gen. Diurn. Lep. vol. i. p. 71. n. 8, pi. viii. 

 tig. 3, male (1847). Dercas VerhueUii, Wallace, Trans. Eut. Soc. 

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

 pp. 36, 4o, pi. ii. fig. 1, male (1870); id., Butler, Ann. .t Mag. Nat. 

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

 vol. i. p. 40, pi. xxii., male (1884-8-'")); id., Schatz, Ex. Schmett. 

 vol. ii. p. 68, pi. vii., male, pal/nis, and antenna (1886) ; id., Swiahoe, 

 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). 



Hah. China (van der Hoeven) ; Bengal [Moure) ; 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. 



