CRAMBUS SELASELLUS. 307 



the spiracles are round and black, each surrounded 

 with a halo of pale ochreous. (William Buckler, 12th 

 June, 1879; B.M.M., July, 1879, XVI, 41.) 



Cbambus tristellus. 

 Plate CLX, fig. 10. 



On the 28th of August, 1874, Mr. W. Robinson- 

 Douglas kindly sent me a small batch of eggs of this 

 species loose in a quill, which were the more welcome 

 from the fact of my having obtained a batch the year 

 before, but with no satisfactory result beyond 

 learning something of the voracity of the larvae, for 

 whilst young they entirely killed a large pot of grass 

 before the following spring, and when I looked for 

 them had all escaped in quest of fresh pasture. 



In order to prevent a similar failure, I this time 

 provided several large pots of Aira flexuosa and A, 

 cxspitosa, among which the newly-hatched larvae were 

 distributed on the 12th, 13th and 14th of September, 

 and, beyond a little attention to the grass by occasional 

 watering, they were not disturbed until April, 1875, 

 when I began to search the remains of the grasses for 

 the larvae. Amongst the A. csespitosa none could be 

 found, only a number of quite small empty galleries, 

 which had been abandoned at an early period, with 

 but little damage to this grass — a proof of its unsuit- 

 ability. Two pots of A. flexuosa had been so ravaged 

 as to be destroyed; the lower parts of the dead grass 

 had a number of silken cases or galleries, both little 

 and big, spun amongst it and covered with frass, but 

 no larva remained, and although several vigorous 

 plants of Luzula multiflora were by chance still 

 growing amidst the dead A. flexuosa, they had not 

 kept the larvae from wandering away, nor had they 

 been eaten at all. 



The third and largest pot of A. flexuosa, though 

 greatly ravaged, still had a little of the grass alive, 



