3 6 Observations on Cynipidae. 



Inquiline. Synergus tncrassatus. 



Parasites. Torymus nobilis, Eurytoma rosae and Olinx tnlineata. 

 These galls are attacked frequently by Tits and have the larvae 

 picked out.] 



6*. Andricus testaceipes. Htg.^ 



Gall. In many cases the galls are only recognizable 

 by a round or tumid thickening of the stalks and veins 

 of the leaf. (See illustration, Fig. 6^.) Within this 

 thickening lies the gall, a hollow chamber scarcely 

 2 mm. long, separated by a thin membrane from the 

 surrounding tissue : but this gall also occurs inside the 

 wood of the shoot, and it is then impossible to distinguish 

 it from the gall o( Andricus noduli. The flies emerge, 

 like Andricus noduli, at the beginning of August. 



Ply. Size about 2 mm. Female, thorax black and 

 dull, abdomen orange, back of the abdomen and ventral 

 sheath dark, legs orange. Male. Entirely black, abdo- 

 men shining, legs pale yellow. This species cannot be 

 distinguished with certainty from Andricus nodtdi. 



Experimental breeding. If the number of flies be 

 sufficiently large it is not difficult to observe them 

 ovipositing. The fecundated females betake themselves 

 for this purpose to the slender shoots or stems, and 

 pierce the bark close to the ground. As a rule the eggs 

 are laid in a ring within the bark of the selected shoot. 

 Gall formation begins in the course of September. 

 The bark at the pricked spots becomes thickened, and 

 soon rises above that of the uninjured parts. If thin 

 tranverse sections are made through the thickened 

 portions, spherical masses of cells are seen in the 

 [' Andricus Sieboldi, sexual form, Cameron.] 



