1 54 



BRITISH GALLS 



Acari 



Fungi 



Coleop- 

 tera 



Lepidop- 

 tera 



Homop- 

 tera 



opens by a slit on the inferior surface. Larva solitary, 

 yellowish. M. E. 



Harmandia tremulae Winn. 175 

 Cohnold, Plant Galls, fig. 41. Swanton, Knowledge, 

 June, 1910. Houard, No. 506. 



Leaves very small, crinkled and thickened, yellow or 

 red, often rolled upwards on one or both margins. 



Eriophyes dispar Nalepa 176 

 Houard, No. 486. 



Small, irregularly rounded, red pustules on the glands 

 at the base of the leaf near the petiole. 



Eriophyes diversipunctatus Nal. 177 

 Connold, Plant Galls, p. 244. Houard, No. 499. 



A swelling on the upper surface (usually) of the leaf, 

 with a corresponding concavity below, the latter lined with 

 numerous projections. Whitish at first, then brown. 



PHYLLOCOPTES POPULI Nalepa 178 



Erineum popuUminp Persoon. 



Greville, 1827, pi. 250. Houard, No. 514. 



Convex golden-yellow blisters on the leaf. See No. 164. 



Taphrina aurea Fries. 179 

 Connold, Plant Galls, p. 200. 



, Carpels becoming much swollen, and assuming a bright 

 golden colour. 



Taphrina jOHANSONiiSadebeck 180 

 Massee, Textbook Plant Diseases, p. 92. 



Populus nigra Linn. Black Poplar. 

 Fusiform or rounded swellings on the young branches. 

 See No. i6i. 



Saperda populnea Linn. 181 

 Houard, No. 526. 



Young branches swollen above. See No. 163. 



Gypsonoma aceriana Dup. 182 

 Houard, No. 530. 



Knotty swellings on branches of the first and second 

 years' growth. 



SCIAPTERON TABANIFORME Rott. 183 



Houard, No. 527* 



Leaf margins bent downwards, with blisters on the 

 under side and black patches on the upper. Aphis pale 

 brownish-green, very hairy; eyes bright red. Larvae 

 various shades of green. 



Chaitophorus leucomelas Koch 184 



Buckton, ii., 136; Houard, No. 541a. 



