NEUROTERUS LZVIUSCULUS. 119 
Colours.—Pale yellow, yellowish-green, green, pink, red. 
Average dimensions of a mature specimen. — Height, 
1 mm.; length, 4 mm.; breadth, 3 mm. 
May be sought during the months of July to September. 
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 the 
spring. 
Parasites, Nos. 165,182. Inquiline, No. 142. 
Alternate sexual generation: Spathegaster albipes, Schenck. 
This gall appears to have been first noticed in 
Britain by Miss EH. A. Ormerod, LL.D., who found 
specimens on oak trees in Kew Gardens in 1870. 
Fie. 14.—Galls caused by Neuroterus leviusculus. a. On upper sur- 
face of leaf. 3B. 1-6, variations in outlines. co. 1-3, bowl shape, on 
under-surface of leaf. bp. 1-4, diagrammatic sections. All x 2, 
dele. ad nat. E.C. 
In both shape and colour this gall is subject to 
greater variations than those of its congeners. 
The gall may resemble a beautiful miniature cream- 
coloured waxen cup, with a tiny cone, standing up like 
a spike, from the base of the concavity. It may bea 
delicate shade of yellowish-green, and shaped like an 
elegantly formed saucer, the centre having a minute 
papilla. Yet another form, is that of a tiny plate, 
rose-red or purple in colour, with hardly a trace of a 
central elevation. Many cupulate examples are pale 
in colour, except the rim which may show quite a con- 
trast in a bright red, or a reddish-brown. 
The outline of the gall is mostly rather longer than 
broad, or even half as long again as broad. Many 
specimens are circular. 
The margin may be entire, or incised to nearly half 
