Pierine Butterflies of the Genus Dercas. 481 



China (Staudinger) ; Khasia Hills, common (Swinhoe) ; 

 Sikkim, local, but where it occurs abundant, found at about 

 4000 feet from May to October (de Niceville) ; two specimens 

 from the Chin Hills, 8500 feet, in the rains (Watson) ; rare 

 in Burmah, one specimen captured in April at Tounggya 

 Sekkan (Adamson) ; Sikkim, Jorhat, Sibsagar, Khasi Hills, 

 Hongkong (coll. de Niceville). 



This species was originally described from China, probably 

 from specimens obtained at Hongkong or close by in the 

 Canton district. At Hongkong it does not appear to be very 

 rare; Mr. E. F. Skertchly has sent me a good series taken in 

 May. No species of Dercas is given by Mr. J. J. Walker in 

 "A Preliminary List of the Butterfliesof Hong-Kong" (Trans. 

 Ent. Soc. Lond. 1895, pp. 433-477). 



2. Dercas Skertchlyi, sp. n. 



Bab. Hongkong, South China. 



Expanse. — $ 2*9, ? 3*2 inches. 



Description. — Male and female. Differs from D. Verhuelli, 

 van der Hoeven, in the fore wing lacking on both surfaces 

 the large apical patch which is such a marked characteristic 

 of that specie.? ; in D. Skertchlyi the costa from about the 

 middle to the apex of the wing, and thence as far as the 

 termination of the first median nervule, has a narrow black 

 border of about equal breadth throughout. Otherwise the 

 two species do not differ. 



D. Skertchlyi cannot be a seasonal form of D. Verhuelli, as 

 both species fly together in Hongkong in May, which is the 

 only month in which Mr. E. F. Skertchly, after whom I 

 have much pleasure in naming the species, has obtained it. 

 It seems to be fairly common on the island, though I did not 

 meet with it myself on the two occasions I was there. 



3. Dercas gobrias } Hewitson. 



Gonepteryx yobrias, Hewitson, Trans. Ent. Soc. Lond. ser. 3, vol. ii. 

 p. 246. n. 5, pi. xvi. tig. 1, male (1864) ; id., Butler, Proc. Zool. Soc. 

 Lond. 1865, p. 432. n. 4, pi. xxv. tig. 4, male. Rhodocera yobrias, 

 Vollenhoven, Faune Ent. l'Arch. Indo-Neerl., Piendes, p. 63. n. 1 

 (1865). Dercas yobrias, Wallace, Trans. Ent. Soc. Lond. ser. 3, 

 vol. iv. p. 398. n.'l (1867) ; id., Druce, Proc. Zool. Soc. Lond. 1873, 

 p. 356 ; id., Distant, Rhop. Malay, p. 308. n. 1, pi. xxvi. tig. 18,male 

 (1885); id., Distant & Pryer, Ann. & Mag. Nat. Hist. ser. 5, 

 vol. xix. p. 271. n. 152 (1837) ; id., de Niceville & Martin, Journ. 

 A. S. B. vol. lxiv. pt. 2, p. 500. n. 550 (1896). 



Hab. Borneo (Beioitson) ; Borneo (Butler) ; Borneo ( Vol- 

 lenhoven) ; Sumatra, Borneo ( Wallace) ; Borneo {Druce) ; 



