SOME BUTTERFLIES FROM THE INDIAN REGION. 769 



able to discriminate between the two sexes not always an easy matter 

 without dissection and microscopical examination, as my own experience 

 has proved. There are no secondary alar sex marks, nor do the leg 

 characters furnish much help. It was therefore with considerable satisfac- 

 tion that I observe one feature of the male which is easily found with a 

 good lens and which, being absolutely characteristic of the male only, 

 affords quick recognition. This is a peculiar appendage, consisting of a 

 brush-like ring of very fine hairs or bristles, radiating from an oval or 

 circular head, placed in the anal orifice and always more or less clearly 

 visible. It very probably is an appendage of the genital organs. 



An exactly similar organ is to be found in the males of the closely allied 

 genera Baoris, Moore, and Chapra, Moore, which have, in addition, alar sex 

 marks. It was the discovery of these in the males of Baoris that led me to 

 make a close examination through the Parnara species. 



