450 L. de Niceville & Dr. L. Martin — Butterflies of Sumatra. [No. 3, 



314 Simiskina pkoxima, de Niceville. 



8. prossima, de Niceville, Journ. Bomb. Nat. Hist. Soo., vol. x, p. 29, n. 13, pi. S, 

 figs. 19, male; 20, female (1895). 



Near to S. potina, Hewitson, from Burma and the Malay Peninsula. 

 A single pair of this species is in Dr. Martin's collection, the male ob- 

 tained by Herr Ude at Bohorok in Eastern Sumatra in September. 



315. Simiskina procotbs, de Niceville. 



S. procotes, de Niceville, Journ. Bomb. Nat. Hist. Soo., vol. x, p. 32, n. 14, 

 pi. S, fig. 21, female (1895). 



Near to S. potina, Hewitson, from Burma and the Malay Peninsula. 

 Described from a single female taken in July at Bekantschan. The 

 remarks regarding Poritia given above apply equally well to the genus 

 Simiskina. With the exception of S. proxima, de Niceville, of which 

 Dr. Martin took a female in April, 1890, very near the sea at the 

 Saentis Estate, all occur in the outer mountains higher than Namoe 

 Oekor. All the species are very rare, but appear to occur more fre- 

 quently from June to August. 



316. Pithecops hylax, Fabricius. 



Snellen as Plebejus [sic] hylax. Hagen. Staudinger. In large 

 forest, also wherever a small piece of jungle is left in young forest, 

 will P. hylax be found flying so quickly that the eye of the collector 

 cannot always follow the little animal. In shadow it is soon lost to 

 view, but becomes visible again when passing one of the errant sun- 

 beams of the forest. It prefers low elevations and occurs throughout 

 the year. 



317. Pithecops mari.e, de Niceville. 



P. marise, de Niceville, Journ. A. S. B., vol. lxiii, pt. 2, p. 30, n. 26, pi. iv, 

 figs. 2, male; 9, female (1894). 



Occurs from Namoe Oekor to the Central Plateau where P. hylax, 

 Fabricius, is no longer found. Dr .Martin obtained the types in Septem- 

 ber, 1893, from Bekantschan. It is nearly allied to, but quite distinct 

 from, P. fulgens, Doherty, from Margherita in Upper Assam, the only 

 other species in the genus yet known which has the male of a brilliant 

 blue on the upperside. When flying in the sun it looks like a sapphire 

 taken to wings. 



318. *Pithecops dionisius, Boisduval. 



Grose Smith. This species is, as far as I know, confined to the 

 Papuan region. 



