120 BRITISH OAK GALLS. 
its breadth, and there may be two or three incisions 
in the same gall. 
The centre of the gall is usually occupied by a small 
sharp-pointed cone, paler in colour than the surround- 
ing tissues with sometimes a few whitish vitreous hair- 
lets at its base. ; 
This gall never occurs in such profusion on a leaf as 
the other Newroterus species, but it more frequently 
develops on the upper surface of the leaf. In common 
with them, however, it is attached by ‘a delicate 
peduncle, and it is also deciduous. It is always 
glabrous, and sometimes highly glossy. 
Neuroterus lenticularis, Olivier. 
(Plate XLVIII.) 
Cynips lenticularis, Olivier; C. quercus-baccarum, Linn. ; Neuro- 
terus Malpighti, Hartig, Tasch., Thoms., Miller, Marshall; N. 
lenticularis, Adler, Mayr, Schenck, Fitch ; N.laeviusculus, Schenck ; 
N. pexizeformis, Schltdl.; N. fumipennis, Hartig; Spathegaster 
interruptor, Hartig; 8. varius, Schenck. 
English name of gall.— The Common Spangle Gall.” 
Position of gall.—On the under-surface of the leaf. 
Manner of growth. —Gregarious, pilose, separate, conglomerate, 
numerous. 
Colours.—Green, greenish-yellow, covered by orange-red, rose- 
red, crimson, and reddish-brown hairlets. 
Average dimensions of a mature specimen. — Height, 
15 mm.; diameter, 5 mm. 
May be sought during the months of July to October. 
Growth is complete by the end of August. ; 
The typical condition of the gall is unilocular and unilarval. 
The larva pupates in the gall. The imago emerges during 
March and April. 
Parasites, Nos. 19, 29, 47, 56, 76, 83, 108, 116, 123, 154, 163, 
165, 182. Inquiline, No. 142. 
Alternate sexual generation: Spathegaster baccarum, Linn. 
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This is the largest, and the most abundant of the 
cupulate, lenticular galls. It occurs throughout Britain. 
The first sign of gall growth, on the under-surtace 
