SPATHEGASTER VESICATRIX. 185 
the gall formation” (‘ Alternating Generations,’ p. 70). 
The bud may be axillary on a twig, or of adventitious 
growth on the bole of a large tree. 
The bud galls are inconspicuous, bursting through 
the large outer leaf scales only when nearly mature ; 
a feature in which they resemble S. aprilinus and 
Aphilothrix albopunctata. 
Those on the leaf, although small, are not difficult 
to find. They are sessile. 
The shape of the gall varies. Some are fusiform, 
others oval, but the prevailing form is cylindrical, the 
distal end terminating in curved blunt conical pro- 
jection. 
The walls of the gall are very thin. The interior 
Fie. 17.—Galls caused by Spathegaster verrucosus. All nat. size. 
In part after Cameron and Adler. dele. E.C. 
constitutes a large larval cavity, without an inner gall. 
The exterior consists of a peculiar granular glossy 
rind, clothed with many minute soft pustules filled 
with a clear liquid. Adler conjectures this is a means 
of protection against parasites (l.c., p. 69). 
Spathegaster vesicatrix, Schlechtendal. 
ee ee a ade rear a 
(Plate LV.) 
Spathegaster vesicatriz, Mayr, Fitch, Ormerod (Miss) ; Newroterus 
vesicatriz, Mayr; N. numismatis, Cameron. 
English name of gall.—“ The Blister Gall.” 
Position of gall.—In the blade of the leaf. 
Manner of growth.—Single, solitary, glabrous, glossy, radiate. 
Colours.—Pale green, grey, pale brown. 
