Forest entomology . orrugated. Itis fairly common in some parts of North-umberland. Dryophanta divisa (Adler). The galls are about the size of a smallpellet or buck-shot, and are found thicklystudded on the under side of the leaves,springing from the veins (fig. 152). Theymay be looked for from June to October, andat first they are of a bright-red colour, butthey gradually change to a light-brown to-wards maturity. The surface is smooth, witha slight depression in the centre. The struct-ure is hard and woody, with a comparativelythick wall and small single larval a dozen to twenty
Forest entomology . orrugated. Itis fairly common in some parts of North-umberland. Dryophanta divisa (Adler). The galls are about the size of a smallpellet or buck-shot, and are found thicklystudded on the under side of the leaves,springing from the veins (fig. 152). Theymay be looked for from June to October, andat first they are of a bright-red colour, butthey gradually change to a light-brown to-wards maturity. The surface is smooth, witha slight depression in the centre. The struct-ure is hard and woody, with a comparativelythick wall and small single larval a dozen to twenty may sometimes be found on one leaf. The flies hatch in October and November, and are about 4 to 5 mm. long. Antennas dark - brown ;head and thorax brown; ab-domen black, and legs of alighter brown than body; wingslonger than body. Biorhiza Group. The first to be considered inthis group is Biorhiza aptera(Fabr.) The galls of thisof the oak, sometimes on thesmallest tips, at other times on strong roots. The galls may. Fig. 150.—Gall of Dryophantascutellaris (cherry gall).
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