558 



Mr. C. L. Withycombe's Notes on 



In all stages larvae of C. tenella may be found carrying 

 debris on their backs. In some examples a considerable 

 coat is carried, in others little or none. 



A very small cocoon, 3 mm. long, is spun for pupation. 

 The pupal stage is of from two to three weeks' duration. 

 Winter is passed as a larva within the cocoon. 



In the table, the first and second each give a fairly typical 

 life-history, showing variation in length of stages in larvae 

 from one batch of eggs. The third case gives the time 

 taken by the only example I have known to emerge the 

 same' year. 



Chrysopa tenella has been found as a larva feeding upon 

 aphids on low plants, as dock, also on trees. Frequently 

 eggs are laid upon apple, the larvae ]3reying easily upon 

 woolly aphis, since their long setae ward off the woolly 

 wax, which would otherwise clog the spiracles. Larvae 

 have been found feeding on the following, which are selected 

 from a far larger list. 



Dock, Aphis rumicis L. 



Grape vine, Pulvinaria betiilae L. 



Apple, Eriosoma lanigernm, Haiism. 



Pear, Brijobia praetiosa K., and Euthrips pyri Dan. 



The pear mentioned was one on which Conwentzia 

 psociformis had been successfully introduced, and almost 

 the entire colony was wiped out by Chrysopa tenella, which 

 preyed upon both larvae and pupae of the Coniopterygid. 



Chrysopa alba L. 



Wing expanse 22-30 mm. 



C. alba is well named, being generally of a pale whitish- 

 green colour, though sometimes of a richer green in life. 

 The eyes are darker than those of other species of Chrysopa, 

 and though also relatively smaller, are very conspicuous. 



