i66 BRITISH GALLS 



catkin to resemble a bunch of red currants. Imago emerges 

 in May or June. This gall also appears on the leaf ; it is 

 then greenish-yellow, rarely tinged red. On the upper 

 surface of the leaf there is a slight rounded swelling with 

 a central scar ; the bulk of the gall is below. It becomes 

 dry and rapidly shrivels at maturity. Imago, June, I. 

 (Plate V. I.) 244 



Neuroterus baccarum Linn. 245 



Syn. Sfiathegasier baccarum Linn. 



Connold, Oak Galls, pi. 53 ; Plant Galls, figs. 215, 227, 

 Houard, Nos. 1196, 1355. ^dlerand Straton, Alternating 

 Generations, pi. i, fig, \a. 



Hymen- On the lower surface of the leaf, a button-like gall, 

 cptera 4 to 5 mm. in diameter, below almost plane, glabrous and 

 whitish, attached to the leaf by a short and slender stalk. 

 The upper surface of the gall is conical, yellowish-white, 

 and closely covered with purplish or brown hairs, often 

 densely gregarious. Imago, March, II. (Plate V. 4, a.) 



Neuroterus baccarum, form lenticularis 246 

 Syn. Neuroterus lenticularis Oliv. 

 Connbld, Oak Galls, pi. 48 ; Plant Galls, figs. 210, 352. 

 Houard, No. 1336. Adler and Straton, Alternating 

 Generations, pi. i, fig. i. 



„ On the under surface of the leaf, a small spherical gall, 



not exceeding 6 mm. in diameter, white or yellowish, 

 covered with white or brownish hairs, which fall away at 

 maturity ; often densely gregarious and deforming the 

 leaves. Imago, July, I. (Plate V. 14.) 



Neuroterus tricolor Hartig 247 



Syn. SpathegOster tricolor Hartig. 



Connold, Oak Galls, pi. 54 ; Plant Galls, fig. 2i6. 

 Houard, No. 1356. Adler and Straton, Alternating 

 Generations, pi. i, fig. 4a. 



,, On the under surface of the leaf, a butlon-like gall, 



from 2-3 mm. in diameter, not exceeding 1*5 mm. in 

 height. Its lower surface is plane or slightly convex, 

 with a central short stalk ; the upper surface of the gall is 

 yellowish, with a prominent central papilla. The edges 

 of the gall are not adpressed to the leaf, and both sides 

 of it are sparsely covered with stellate reddish or brown 

 hairs. Often densely gregarious. Imago, April or May, II. 

 (Plate V. 4, b.) 



Neuroterus tricolor, form fumipennis 248 



Syn. Neuroterus fumipennis Hartig. 



Connold, Oak Galls, pi. 46; Plant Galls, fig. 207. 

 Houard, No. 1338. Adler and Straton, Alternating 

 Generations, pi. i, fig. 4. 



