156 



BRITISH GALLS 



Diptera Fusiform elongated swelling, lo mm. long, on the mid- 



rib or on a lateral vein, green or violet, containing three 

 or four larvae, which are white at first, then bright red. 

 Metamorphosis takes place outside the gall on the dried- 

 up leaf. 



Massalongia rubra Kieff. 193 

 Connold, Plant Galls, fig. 62 (without name). Swanton, 

 Knowledge, June, 1910. Houard, No. 1075. 



,, Catkin deformed and dwarfed. 



(?) Oligotrophus betulae Winn. 194 

 Syn. Cecidomyia betulae Wtz. 



Connold, Veg. Galls, pi. 120; Plant Galls, fig. 64. 

 Binnie, 1877, p. 183. Houard, No. 1068 (without name). 



Acari On the under surface of the leaf, usually in the kxils of 



the nervures, in a depression corresponding with a more 

 or less circular swelling (2 mm. high) on the upper surface, 

 a mass of cylindrical contorted hairs. Reddish-brown 

 above, the pubescence reddish. Phyllerium tortulosum 

 GreviUe. 



Eriophyes lionotus Nalepa 195 

 Connold, Veg. Galls, pi. 5 S ; Plant Galls, fig. 60. Houard, 

 No. 1081. 



„ Bud swollen, up to 10 mm. in diameter, with more or 



less imbricated and recurved scales. The branch below 

 the terminal gall is always thickened, and often quite 

 arrested in development ; if its growth is continued the 

 internodes are usually shortened; ultimately a "witch's 

 broom " results. Axillary buds are also attacked. Felt- 

 like patches of white or reddish hairs on the leaf (usually 

 below) are caused by the same agency. (Plate XX.) 



Eriophyes rudis Canest. 

 Connold, Veg. Galls, pis. 16-20, 63 ; Plant Galls, fig. 59. 

 Houard, Nos. 1072, 1085. 



Irregular rounded swelling on the upper surface of the 

 leaf, usually between the veins, covered with a rough 

 yellow, brown, or red felt. The corresponding depression 

 below filled with a mass of white club-shaped hairs. 

 Solitary, gregarious, or coalescent. June to October. 



Eriophyes rudis Can., var. longisetosa Nal. 



Connold, Plant Galls, fig. 61. Houard, No. 1083. 



Numerous buds, slightly hairy, massed together on a 

 more or less circular woody boss of variable size on the 

 stem and larger branches. 



Eriophyes sp. 



Connold, Plant Galls^ fig. 57. Houard, No. 1073. 



196 

 197 



199 



