Forest entomology . Fig. 135.—Galls of Neuroterusfumipennis. Fig. 136.— Galls o/Spathegaster tricolor.(Drawn by P. J. Brown.) the outer edge lying flat on the leaf, whereas the species in questionhas the outer edge of the gall raised and slightly depressed in thecentre. Thus the individual galls somewhat resemble a saucer. According to Adler, larval development does not begin until March(by the time Neuroterus lenticularis has hatched), and the flies appearabout the end of May. The same authority says this fly is easilydistinguished from all the other species of ISTeuroterus. Size 2
Forest entomology . Fig. 135.—Galls of Neuroterusfumipennis. Fig. 136.— Galls o/Spathegaster tricolor.(Drawn by P. J. Brown.) the outer edge lying flat on the leaf, whereas the species in questionhas the outer edge of the gall raised and slightly depressed in thecentre. Thus the individual galls somewhat resemble a saucer. According to Adler, larval development does not begin until March(by the time Neuroterus lenticularis has hatched), and the flies appearabout the end of May. The same authority says this fly is easilydistinguished from all the other species of ISTeuroterus. Size 2 dull black; base of abdomen orange ; legs, including thefemora, orange ; wings, especially at the tips, May 27, 1895, in Cheshire. HYMENOPTERA OAK GALLS. 14i. Galls o/Neuroterus lieviusculus. 2ft, Spathegaster tricolor (Htg.) The sexual species forms a pea-shaped hairy gall of light-yellowish-green colour (fig. 136), appearing about the end of June or beginning ofJuly. They are found in clusterson the under side of the hairs fall off when thegall matures, and then it maybe mistaken for Spathegasterbaccarum, which, however, isover by this time. The fly is a very slenderinsect, the wings when spreadout being comparatively longin proportion to the body is about 2 mm. long, and the expanse of wings 8 body is black throughout, legs all yellow, and the wingsrather cloudy. Males and females very muchalike. 3. Neuroterus LiEViuscuLUS (Schenck.) This gall (fig. 137) is very much like thetwo previous species in general appearance,but not so common or so numerous on theleaf. The form is similar, but in thisspecies the gall is nearly smooth except ona well-defined knob in the centre, which iscovered with hairs. I have not rea
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