174 



BRITISH GALLS 



Homop- 

 tera 



Leaf margin folded downwards, scarcely swollen. Aphis 

 oval, pale green or yellow, with very short green cornicles. 



Callipterus quercus Kalt. 282 

 Buckton, iii., p. 21. Houard, No. 1628. 



Minute swelling on the upper surface of the leaf; a 

 rounded depression below, about i mm. in diameter. 



Trioza remota Forster 285 

 Houard, No. 1312. 



In the bark of the twigs. Little circular pits, 2 mm. in 

 diameter, surrounded by an elevated circle of bark, single, 

 gregarious or coalescent. May to July. 



Asterodiaspis quercicola Bouch^ 284 



Syn. Asterolecaniutn variolosum Rtz., Coccus vario- 

 losum Rtz. 



Connold, Oak Galls, pi. 62 ; Plant Galls, fig. 173. 

 Houard, No. 1299. 



Rounded swellings in the bark, chiefly of saplings, 

 which attain the size of a hen's egg, and then crack and 

 become deeply fissured and cankered, sometimes attain- 

 ing large dimensions. 



Hymen- 

 optera 



Connold, Oak Galls, pis. 65, 66 ; Plant Galls, fig. 167 

 Attributed to the fungus Uichaena quercina, but prob- 

 ably resulting from the attacks of insects. 



Quercus cerris Linn. Turkey Oak. 



Oval gall, not exceeding 5 mm. in height, seated in the 

 centre of a bud, surface smooth and shining, yellowish- 

 brown or red. Sometimes gregarious, five to six in a bud. 

 Imago, March to May, I. According to Beyerinck, the 

 alternate generation of the marble gall-causer, Cynips 

 Kollari. (Text, Fig. 5.) 



Andricus circulans Mayr. 



Connold, Oak Galls, pi. 5. Houard, No. 1840. 



284a 



285 



Staminate catkin deformed. A flower is changed into 

 a hard urn-like structure, 15 mm. high, 10 mm. wide, with 

 a wide collar above, Plurilocular. Usually the axis of 

 the catkin is greatly swollen, the galls numerous, and 

 grouped into a mass attaining 40 mm. in diameter. 

 Imago, July, August, I. This gall has not been observed 

 in Britain. Cameron, however, captured a female insect 

 at Loch Lomond. 



Andricus aestivalis Giraud 286 



Connold, Oak Galls, pl. 5. Houard, No. 1811. 



