CERURA FURCULA. 141 



instead of a spike, has a little pit in the middle ; the 

 pectinated antenna-cases distinct, though not promi- 

 nent, the skin dull except at the tail, which is quite 

 glossy; the colour deep red-brown, the wing-cases 

 having a tinge of green. (J. EL, 10, 12, 86.) 



Cerura bifida. 

 Plate XXXII, fig. 3. 



This larva was figured by Mr. Buckler August 

 20th, 1868, on aspen, and the imago bred June 

 12th,1869. In 1858, I had two full-grown larvae, 

 August 7th, and bred the moths June 2nd and 4th, 

 1859. In 1868, I had a small larva on aspen, June 

 30th. In 1870, I bred moths on May 12th and 

 14th. Several times I found cocoons on the bark of 

 poplar trees ; though exactly of the tint of the bark, 

 they could be detected by their filling up a crack; 

 they were hard to be removed from the trees without 

 injury to the enclosed pupae. 



In 1886, I received some larvae on poplar from Mr. 

 G. T. Porritt, August 11th; these began to spin 

 August 17th. Mr. W. H. Harwood sent me some 

 larvae August 28th, which began to spin on the 30th. 



The full-grown larva is nearly 35 mm. in length, 

 stouter than furcula, the face flat, head retractile, the 

 front of 2 squared, with a rough spot on either side, 

 and the back of 2 somewhat horny, the body from 10 

 tapering backwards to a point, the tails rather rough, 

 6 or 7 mm. long; the dorsal mark begins broad on 

 the front of 2, narrows to the dorsal hump on 3, 

 where in some examples it stops bluntly, (leaving the 

 front of 4, and sometimes all 4 and front of 5, of the 

 green ground colour), and beginning again very acutely 

 on 4 or 5, and widening till at 7 it either reaches the 

 spiracle level, or else encloses the spiracle, and then 

 narrows again, always widens and encloses the spiracle 



