1887.] 



ON CYCLESTHERIA HISLOPI. 



9 



every doubt, as I do not find a single character that points 

 to a specific difference; and also the specimens examined by 

 Brady must belong unquestionabiy to the same species, having, 

 according to that author, been carefully compared with the type- 

 specimens in the British Museum. The present form being thus 

 the only species as yet known of the genus, it is somewhat dif- 

 ficult to decide with certainity what characters should be regarded 

 as strictly specific. I have, however, in the diagnosis furnished 

 above sought to adduce some distinctive peculiarities, which, from 

 analogy with other forms, may, perhaps, prove of weight in this 

 respect. 



