340 Mr. A. G. Butler on Lepidoptera from 



Five males, agreeing exactly with typical A. vacans in the 

 more sulphnr-tinted colour of the under surface, by which 

 character alone can I distinguish the males of this species 

 from those of A. Eleonora^ whereas the females differ widely 

 enough. Mr. Moore's figure in ' Lep. Ceylon ' better repre- 

 sents A. Eleonora, being decidedly too ochraceous for my 

 male of A. vacans. 



92. Hiposcritia durvasa. 



Pieris durvasa, Moore, Oat. Lep. E. I. Comp. i. p. 73. n. 142 (1857) ; 

 P. Z. S. 1857, pi. xliv. fig. 6. 



Four males. Near Assam. 



93. Hiiioscritia lalage. 



Pieris lalage, Gray, Zool. Miscell. p. 76 (1842) ; Doubleday & HewitsoD, 

 Gen. Diurn. Lepid. pi. vi. fig. 5 (1847). 



Ten males. Manipur, 



94. Hiposcritia pseudolalage. 

 (J . Catophaga pseudolalage, Moore, P. Z. S. 1879, p. 142. 



Manipur. 



Three males represent this species, but in so shattered a 

 condition that they are chiefly valuable as indicating the 

 existence of the species at Manipur. 



95. Hiposcritia argyridina^ sp. n, 



(^ . Above similar to H. pseudolalage^ but usually smaller 

 and with the spot on second median interspace better sepa- 

 rated from the external border ; basal area more silvery than 

 in any of the allied species : below it differs in the apical area of 

 primaries, and whole of secondaries being irrorated with brown, 

 as in H. maJiana, instead of pale buff. Expanse of wings 

 56-62 millim. 



" January 8, 1881. Valley of the Khoouah Khong, Eastern 

 Kanges, Manipur. 



"I was surprised on reaching the river to find a white 

 butterfly in great abundance flying down the stream _ in 

 strings of fifty to a hundred like ducks. I had a swing 

 with my net and caught ten to fifteen at each turn. I don't 

 remember to have seen this habit, nor indeed the insect before. 

 Not a single specimen was seen flying up the river, nor 

 one fluttering about; all seemed intent upon some definite 

 journey down stream, each following his neighbour : if dis- 

 turbed they changed their course for a time, but soon re- 

 sumed it. I was still further surprised to find the same insect 



