92 [April. 



Society, he admits that the insect which he treated as a male in re- 

 defining Moore's genus was really a female, and states that it is 

 therefore necessary to take a fresh character on which to separate the 

 two genera. He gives this fresh character as follows : — 



Male, inner margin of fore-wing longer than outer margin Pisola, Moore. 



Male, outer margin of fore-wing longer than inner margin Capita, Moore. 



In his " List of the Butterflies of Sikkim " (Gazetteer of Sikkim, 

 Calcutta, 1894, p. 17G, No. 512) de Niceville records and remarks upon 

 " Pisola Zeniiara, Moore," of which he says that he possesses five 

 " males ;" apparently overlooking the fact that on his own showing no 

 male insect was described by Moore under the name of Pisola Zennara. 



Why two such authoritative writers as de Niceville and Watson 

 should make two genera for the two male insects which have hitherto 

 been known as the male and female of dipila Jayndeva, Moore, is not 

 clear. Here we have two insects so similar in structure and appear- 

 ance, that for more than a quarter of a century entomologists were 

 content to regard them as sexes of the same species ; but now, because 

 there is a trifling difference between them in the relative length of the 

 outer and inner margins of the fore-wing, in other words, because the 

 fore-wing of one is a little more pointed than that of the other, they 

 are each to be placed in a separate genus. 



II. — Erionota acroleuca, Wood-Mason and de Niceville, 

 and E. grandis. Leech. 



Mr. de Niceville, writing of JErionota acroleuca, W.-M. and de 

 Nice., in his before-mentioned List of the Butterflies of Sikkim, 

 p. 181, No. 567), says, " Very rare. I obtained one example, Mr. Otto 

 Moller two only in Sikkim, after many years' assiduous collecting. It 

 occurs also in Western and Central China, and has been named 

 ^ Hiclari'' grandis by Leech." 



I take this opportunity of pointing out that the Plesioneura 

 grandis of Leech [Entomologist, xxiii. p. 47 (1890), Hidari grandis, 

 Leech, Butt. China, &c., p. 633, pi. xxxix, fig. 18 $ (1892—1894)], is 

 not the same as the Hesperia acroleuca of Wood- Mason and de Nice- 

 ville (Jour. As. Soc. Beng., 1881, p. 260). The latter, of which there 

 are in Mr. H. J. Elwes' collection, now under my charge, two 

 specimens from the Andaman Islands, one of them labelled acroleuca 

 by Mr. de Niceville, is for me a local form of 'Erionota tlirax, distin- 

 guished by its smaller size, and a tendency to a completely rhomboidal 

 form of the pale spot in cell 3 of the fore-wing above. The pale shade 

 in the apex of the fore-wing above is present in varying degrees in 



