l62 THE OAK GALLS AND GALL INSECTS 



the sexual generation appearing from them at about the 

 beginning of June. These insects oviposit in the axillary buds. 

 In September, or not until October in some cases, the A. malpighii 

 galls are formed. The full grown larva, however, does not 

 pupate until the following autumn, emerging in April of the 

 second year. That is to say, the larva iu an ^. malpigJiii gall 

 formed in the autumn of 1898 would not emerge as a perfect insect 

 until April, 1900. 



OCCURRENCE IN EPPING FOREST, 



Andricns malpighii. Not common. I found some of these 

 galls appearing from buds of twigs growing adventitiously on the 

 trunk of the tree. They appear much later than is the case with 

 the A. callidouia galls. First appearance noted, September 19th. 



I was not able to obtain any Andricns nndiis galls in Epping 

 Forest. 



(19). Agamic Generation. IX. Andricus autumnalis 

 (Htg.) 



Inquilines. Synevgus neyvosns (Htg.), S. apicalis (Htg.) 

 S. viificornis (Htg.) 



Gall. 



Like A. globiili, this gall is formed from the bud its base 

 being surrounded with bud scales. 



The real gall is covered with a brownish green sappy rind 

 which subsequently falls off. If the gall is not removed, the 

 rind falls off, but otherwise it remains on the gall, becoming 

 longitudinally ridged. Shape : Oval, apex pointed. Colony : 

 Brownish green. 

 Imago. 



Colour: Black. Antennae'. Brownish, basal two joints yellowish red. 

 Thorax: Black, wrinkled and dull. Abdomen: Shining black above, reddish 

 brown below. Legs : Dark yellowish red, trochanters and bases of coxae 

 darker. 



(19). Sexual Generation. IXa. Andricus ramuli 

 (Linn.) 



Inquilines. Synevgus facialis (Htg.) and 5. radiatus (Mayr). 



GalL 



Develops either from a male flower bud or from a leaf 

 bud. The gall itself is brownish yellow in colour, covered 

 thickly with white matted hairs giving it the appearance of 



