Pterine Butterflies of the Genus Derca3. 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, 3500 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 ; j\Ir. 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. Lend. 1895, pp. 433-477). 



2. Dercas Skertchlyi^ sp. n. 



Hah. Hongkong, South China. 



Expanse. — ^ 2"9, ? 3*2 inches. 



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

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

 the large apical patch which is such a marked characteristic 

 of that species; in D. Skertchlyi the costa from about the 

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

 termination of the tirst 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. E. 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 gohrias^ Hewitson. 



Gonepteryx yohrias, Hewitson, Traus. Ent. Soc. Lond. ser. 3, vol. ii. 

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

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

 Vollenhoven, Faune Ent. I'Arcli. Indo-Neerl., Pierides, p. 63. d. 1 

 (1865). Dercas guhrias, Wallace, Trau;:. Ent. Soc. Lond. ser. 3, 

 vol. iv. p. 398. n. 1 (1867) ; id., Druce, Proc. Zool. Soc. Lond. 1873, 

 p. 356 ; id., Distant, Rhop. Malay, p. 308. u. 1, pi. xxvi. fig. 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. Ixiv. pt. 2, p. 500. n. 550 (1896). 



Hah. Borneo [Hewitson) ; Borneo [Butler) ; Borneo [Vol- 

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



