i6o BRITISH GALLS 



covered with minute wart-like projections, amongst which 

 the mites swarm in summer. 



Eriophyes avellanae Nal. 218 



Syn. Phytoptus coryli Pets. 



Connold, Veg. Galls, pi. 47; Plant Galls, fig. 133. 

 Houard, No. 1056. 



Quercus Robur Linn. 105. British Oak. 



I. Cynipidae with Alternating Generations 



Hymen- Oil the male catkin. Gall ovOid, about 2 mm. hi^h, 

 optera taking the place of a stamen, green at first, begging 

 brown. It is covered at the apex with a closely crowded 

 mass of white hairs, 6 to 8 mm. long. It appears at the end 

 of April. Sometimes all the stamens of a catkin are 

 attacked ; the axis of the latter does not develop, and the 

 gall then appears as a mass of cottony threads surrounded 

 by the bud scales. Imago, June, I. 



Andricus CIRRATUS Adler 219 

 Connold, Oak Galls, pi. 14 ; Plant Galls, fig. 220. 

 Houard, No. 1185. AtUer and Straton, Alternating 

 Generations, pi. 2, figi i la. 



„ In an axillary bud. Gall fusiform, with a long stalk; 



total length 20 mm.; yellowish-green, becoming brown, 

 marked with more or less pronounced longitudinal ribs. 

 First appearing in May. Imago, spring. III. 



Andricus cirratus, form callidoma 220 

 Syn. Andricus callidoma Giraud; ApMlothrix calli- 

 doma Hartig. 



Connold, Oak Galls, pi. 18; Plant Galls, fig. 184. 

 Houard, No. 1254. Adler and Straton, Alternating 

 Generations, pi. 2, fig. 11. 

 „ On the leaf; the colour, shape, and size of a pea, 



glabrous above, slightly hairy below, provided with a 

 large cavity containing an internal gall. Sometimes on 

 the terminal twig. Always causing distortion and bend- 

 ing of the part attacked. Spring and summer. Imago, 

 May and June, I. 22' 



Andricus curvator Hartig 222 

 Connold, Oak Galls, pis. 6, 7 ; Plant Galls, figs. 169, 195- 

 Houard, No. 1351. Adler and Straton, Alternating 

 Generations, pi. i, fig. 9a. 

 , In an axillary bud. Gall minute, fusiform, 3 to 4 mm. 



long ; its basal part, together with a small peduncle which 

 supports it, is hidden by the bud scales. The apex is 

 pomted ; just below the point there is a circular depres- 



