OF EPPING FOREST. l6l 



begin to form in July, at the beginning of the month. These are 

 A. fecnndatvix galls, and they do not as a rule give up the 

 perfect insects until April of the second or third year. In 

 August of the first year, and before it is mature, the inner gall is 

 often thrust out by the scales and falls to the ground. 

 OCCURRENCE IN EPPING FOREST. 

 Andvicus fccundatfix. Fairly abundant. In some instances 

 twigs of some length may have galls appearing from every bud. 

 I have often found the inner galls to be parasitised and 

 polythalamous. The scales which form a covering for the inner 

 gall may remain upon the tree for a considerable period; they 

 often contmue on the tree during the following summer. First 

 appearance noted, July 12th. 



I was unable to find any A . pilosus galls in Epping Forest. 



(18.) Agamic Generation. VIII. Andricus malpighii 

 (Adler). 



Gall. 



Very like A. callidoma, and found also in the axils of the 



leaves. It can be told, however, by the absence of the long 



thin stalk, which gives the gall a plumper appearance, the stalk,. 



if present, being very short and thick. Parasitised A. callidoma 



galls often resemble A. vialpigliil, but as the latter appear at a 



much later date they can usually be distinguished. 



Imago. 



Can scarcely be told from A. calliJoma, but it is usually darker in colour ; the 

 femora and upper half of the tibiae are dark. 



,18.) Sexual Generation. VIIIa. Andricus nudus. 

 (Adler). 



Gall. 



Found on the male catkins between the anthers. Glabrous^ 

 but with sometimes a few hairs at the apex. Colouv : Green 

 when young, becoming yellow at maturity. Shape : Elongated 

 oval. 



Imago. 



Colon/ : Black. Antennae-. Dark, basal 4-5 joints yellow. Thorax: SHghtly 

 shining. Abdomefi : Paler than the thorax, ventral surface usually testaceous. 

 Legs : Yellow, the base of the anterior coxae may be daric. 



Account of the Generation Cycle. 



The flies from the A. malpighii galls emerge in April and 



oviposit in the male catkin. A. nudus galls are formed in May^ 



