OF EPPING FOREST. I49 



■eggs in the adventitious buds near the base of the tree. 

 Dvyophanta similis galls are formed at the end of April or the 

 beginning of May ; from these the flies emerge usually about the 

 middle of the month, earlier as a rule than D. taschenbergi. 



This sexual generation oviposits on the undersurface of the 

 oak leaf, the resulting gall, D, longivcntris, appearing at the end 

 of July or beginning of August. 



OCCURRENCE IN EPPING FOREST. 

 Dvyophanta longiveniris. Very plentiful, but less so than 

 D. folii. When these galls are kept in a room the flies may 

 emerge in October, and I have taken mature flies from the galls 

 in September. First appearance noted July 19th. I met with 

 only a few specimens of Dvyophanta similis^ mostly on twigs 

 growing adventitiously from the trunks of the trees, especially 

 near the base. First appearance noted May loth. 



(9). — Agamic Generation. III. Dryophanta divisa (Htg.) 



Inquilines. Synevgus pallicornis (Htg.), S. tscheki (Mayr), and 

 ^. alhipes (Htg.) 



Gall. 



The galls in this instance are more numerous on the leaf than is 

 the case with the corresponding generations of preceding species 

 of this genus. They are found on the under-surfaceof the leaves. 

 Shape '. Roundish, with a depression at the top. The larval 

 cavity is small and the walls are thick. It is hardy and woody. 

 Colonv : Red when young, becoming brown with age. 



Imago. 



Colour : Brown, may be slightly reddish. Antennae : Black. Thorax : 

 !Mesonotum pubescent, with two black stripes, punctured anteriorly. Sutures 

 black. Abdomen : Black. L^gs : Brown with base of coxae infuscated ; 

 trochanters, and more or less of the tarsi, black. 



(9). — Sexual Generation. IIIa. Dryophanta verrucosus 

 (Schltdl). 



Gall. 



I have not found this gall in Epping Forest. Elongated with 

 rounded extremities, it may appear on the leaves or buds. 

 Colouv: Varies from green and greenish yellow to red. 



The gall secretes a fluid in its vesicles, which covers it as a 

 protection against parasites, giving it a glossy appearance. 



Imago. 



Identical with preceding sexual forms. 



