120 BRITISH OAK GALLS. 



its breadth, and there may be two or three incisions 

 in the same galh 



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 Avhitish vitreous hair- 

 lets at its base. 



This gall never occurs in such profusion on a leaf as 

 the other Neuroterus 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 XLYIII.) 



Cyni]}s leiitinilaris, Olixiev \ C. quevcus-haccanim, Jjhni. ; Neuro- 

 terus Maljnghii, Hartig, Tascli., Thorns., Miiller. Marshall; N. 

 lenticularis, Adler, Mayr, Scheuck, Fitch ; JV^. Innnuscuh(S, Scheuck ; 

 N. pezizieformis, Schltdl. ; N. fumipennis, Hartig ; Spathegaster 

 interrvptor, Hartig ; 8. varins, Schenck. 



English name of gall. — "The Common Spaugie Gall."' 



Position of gall. — On the imder-surface of the leaf. 



Manner of growth. — Gi-regarious, pilose, separate, conglomerate, 

 numerous. 



Colours. — Green, greenish-velloAv, covered h\ orange-red, rose- 

 red, criiiison, and reddish-brown hairlets. 



Average dimensions of a mature specimen. — Height, 

 1'5 mm. : diameter, 5 mm. 



May be sought during the months of July to October. 



Growth is complete l)y the end of August 



The typical condition of the gall is unilocular and unilarval. 



The larva jjupates in the gall. The imago emerges dm-ing 

 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 haccarvm, Linn. 



This is the largest, and the most abundant of the 



cupulate, lenticular galls. It occurs throughout Britain. 



The first sio-n of o'all o-rowth, on the under-surface 



