186 CHIONASPIS SALICIS. 



a single puparium on apparently the most friendly 

 terms. Although the male has a head literally full of 

 eyes, they do not seem to enable it to distinguish the 

 puparium containing the virgin female from those of 

 the old adults of the previous years. Furthermore, a 

 male may often be seen actively engaged in probing its 

 stylus beneath some foreign body, to which it will 

 return several times to repeat its fruitless task. 



I have only once met with a colony of partheno- 

 genetic females, and this was in an exposed situation 

 on the limestone escarpment at the Loggerheads, near 

 Mold, Denbighshire, on the ground where Afjrotis 

 ashworthii has been taken for a number of years. 

 They occurred on a group of young ash plants, which 

 they had almost covered, but a male in any stage was 

 not to be seen ; and this is the more remarkable, since 

 they were abundant in other localities at the same 

 time. 



The American Ghionaspis fwfwrwt, Fitch, was re- 

 corded as British by Mr. C. F. Morgan (Ent. Mo. 

 Mag., S. S., vol. iii, p. 16). A careful examination of 

 specimens kindly supplied by the author convinces me 

 the specimens are referable to G. salicix. The small- 

 ness of the male puparia of C. ////;/'// n/x, which Mr. 

 Morgan takes as one of the special characters in the 

 separation of the two species, is unfortunately an 

 unreliable one. I frequently find the male puparia of 

 G. wilicis, especially those from birch and privet, to be 

 equally small as typical C. fwrfurus. 



EXPLANATION OF PLATES. 



PI. XIX, fig. 1. Insects natural size in situ on branch 

 of willow. 



Fig. 2. Puparium of adult female. X 15. 



Fig. 2 A. Puparia of adult female mixed with epi- 

 dermal layer of bark. X 15. 



