OF EPPING FOREST. I59 



Gall. 



Situated in the axils of the leaves. Shape : Cylindrical, 

 pointed at the apex, furnished with conspicuous longitudinal ribs. 

 It grows on a long thin stalk. Colony : Green ; ribs red. 



Imago. 



Colour : Reddish yellow. Antennae : Dark. Abdomen : Dorsal surface dark 

 brown. J^e^s : Brownish yellow, posterior tibiae dark, vexy like A. quadrilineatiis \ 

 some specimens are practically identical, though both are very variable. 



(16.) Sexual Generation. VIa. Andricus cirratus (Adler.) 



Gall. 



Appears on the stalk of the male catkin. Green when 

 young, becoming yellow and brown with age, furnished with 

 long white hairs, especially at the apex. I have found specimens 

 covered with long straggling white hairs, which are not dense, 

 the galls being yellowish, small and rounded. Three or four galls 

 may be found together, forming a more or less woolly mass. 



Imago. 



Colour : Black. Antennae : Testaceous, apices dark. Thorax : Tegulae 

 entirely, and pronotum partially yellow. Abdomen dark above, sides reddish 

 yellow, ventral surface reddish brown. Legs : Yellow ; posterior trochanters and 

 bases of coxae dark. Wings: Hyaline. 



Account of Generation Cycle. 



When the larvae are mature, the A. callidonia galls lose their 

 colour and become a uniform dull brown. The insects emerge in 

 April, and lay their eggs on or between the anthers. The 

 resulting gall, A. civvatits, appears in May, the flies emerging 

 about the middle of June. 



After copulation they proceed to oviposit in the axillary 

 buds. About the middle of July the galls of A. callidonia appear 

 from the buds, though in many cases they do not appear until 

 August. 



When mature these galls fall to the ground, the flies appear- 

 ing either in the following spring or not until April of the second 

 year. 



OCCURRENCE IN EPPING FOREST. 



Andricus callidonia. Fairly plentiful. This gall, when 

 parasitised, may remain on the tree for some time before 

 falling to the ground ; brown and dry galls may often be found 

 still attached quite late in the year. First appearance noted, 

 August 2 1 St. 



