86 BRITISH OAK GALLS. 



Aphilothrix globuli, Hartig. 

 (Plate XXIII, div. C.) 



Cynips globuli, Hartig-, Sclienck., Kirch. ; Aphilothrix glohuli, 

 Mayr, Licht., Adler, Fitch; Andricus globuli, Mayr, Cameron, 

 Mosley. 



English name of gall. — " The Globular G-all." 



Position of gall. — In lateral and terminal buds. 



Manner of growth. — Sessile, solitary, g-labi-ous, globular, oblate. 



Colours. — Pale green, green, greenish-ljrown, bluish. 



Average dimensions of a mature specimen. — Griolmlar; 

 girth, 12 mm. 



May be sought during the months of September to November, 

 and occasionally in December. 



Growth is complete by the end of October. 



The typical condition of the gall is unilocular and unilarval. 



The larva pupates in the gall. The imago emerges during 

 April of the second year. 



Parasites, Nos. 14, 38, 44, 56, 113, 118. Inquilines, Nos. 1, 

 133, 138, 145. 



Alternate sexual generation : Andricus injlafor, Hartig. 



A favourite situation for these galls is on the long 

 and slender twigs which so often grow from the bole 

 of an old oak situated in a more or less open wood. I 

 have seen scores of such twigs with from one to eight 

 galls in terminal and axillary positions. 



Small l^ushes near the bole of the tree, or more 

 generally those just beyond the limits of the lower 

 branches, will also frequently yield numerous speci- 

 mens, wdiile the small twigs of the branches themselves 

 will often have galls. 



This is one of the late autumn galls, specimens fre- 

 quently being seen in situ during November and occa- 

 sionally in December. It is a pretty little gall, mostly 

 oblate in shape ; this, however, is not apparent until 

 it is mature and divested of the outer rind. Many 

 specimens are quite spherical. It is formed in a bud 

 and bursts through the leaf-scales during October. 

 For a short time only a small portion of the growing- 

 gall can be seen, l)ut ultimately about two thirds of 



