ON THE COMMON OAK 



173 



Lepidop- Near the extremity of a bratich, a more or less incurved 

 tera swelling, two or three times the normal diameter of the 

 branch. Caterpillar in the pith. Exit below. 



Stenolechia gemmella Linn. 276 

 Houard, No. 1300. 



II On the leaf. The midrib swollen, j to 8 mm. long, colour 



yellowish, also on petiole, the affected part attaining three 

 times the normal diameter. Caterpillar white sprinkled 

 with brown hairs, head black. M. E., rarely M. G. 



Heliozela stanneella Fisch. v. R. 2Tf 

 Houard, No. 13 16. 



Diptera Terminal internodes not expanding, the leaves forming 

 loose tufts, crinkled along their swollen veins. Larvae 

 whitish, gregarious, leaping. 



CONTARINIA QUERCINA Rtib. 278 



Trail, Scottish Nat., iv., 1877. Houard, No. 1207. 



,1 One or more of the marginal lobes of the leaf thickened, 



folded downwards and flattened upon the lower surface, 

 forming a pouch which is reddish above and spotted with 

 red and yellow below. Larvae gregarious, two to six, 

 whitish. (Plate VIII. 9, 10.) 



Macrodiplosis dryobia F. Low 279 

 Syn. Diplosis dryobia F. Low. 

 Houard, No. 1306. 



, The edges of the leaf segments folded over on the 



upper surface ; within each fold are one to four pale ■ 

 orange-yellow larvae. There is no marked discoloration 

 of the affected parts. 



Macrodiplosis volvens Kieffer 280 

 Syn. Cecidomyia roboris Hardy. 



Connold, Oak Galls, pi. 63 ; Plant Galls, fig. 200, and 

 in both wrongly attributed to M. dryobia. Trail, in Wild 

 Fauna and Flora of Kew Gardens, igo6, p. 44. Houard, 

 No. 1307. 



Acari On the lower surface of the leaf, adjacent to the larger 



vein, a felt of abnormal hairs of two kinds : one hyaline, 

 very long and much contorted ; the other shorter and 

 cylindrical, scarcely bent, and often swollen into a club 

 at the top. Erineutn querdnum Persoon. 



Eriophyes quercinum Can. 281 

 Trail, in Wild Fauna and Flora of Kew Gardens, 1906, 

 p. 44. Houard, No. 1313. 



