28 CLADIUS PECTINICORNIS. 



and the larger nervures rarely, if ever. Two genera- 

 tions are met with in the year, the first in May and 

 the early part of June, the second in August and 

 September. From the summer brood the flies appear 

 two or three weeks after pupation. The autumnal 

 Iarva3 remain unchanged till the spring. The cocoon 

 is double, the outer covering transparent and thin, 

 and is separated by a small space from the inner 

 cocoon, the texture of which is closer, finer, and more 

 compact. Both coverings are of a dull grey colour. 



The larva is flat, moderately narrow at the second 

 segment ; thence it increases in thickness to a little 

 past the middle, from where it decreases again slightly 

 towards the tail. The head is small, shining, covered 

 sparsely with longish hairs ; the ground colour is green, 

 but obscured with numerous small brown dots, closely 

 packed together ; across the face is a semicircular 

 brown mark of a deeper colour than the dots on the 

 vertex ; eyes deep black ; mouth brown. The body 

 is entirely deep green, sometimes having a yellowish 

 tinge. On each segment are three rows of tubercles, 

 from each of which projects a long brown hair ; the 

 legs are glassy green with brown claws. The colour 

 of the head varies ; when the larva is young it is 

 browner than when full fed, at which time the whole 

 body assumes a much brighter, more shining green 

 colour. Acrotomus lucidulus, Gr., and Mesochorus 

 cimbicis, Rtz., are parasites. 



The pupa I have not noticed when very young ; 

 when I did see one it was of a grey colour. 



This species is tolerably common in Scotland and 

 England, especially in gardens. 



Continental distribution : General. 



SECTION II. 



with the antennae as long as the body, covered with longish 

 pile ; third joint at the base produced into a knob; remaining 

 joints simple. Cerci short. Trichio campus. 



