Forest entomology . Fig. 152.—Galls o/ Diyo-phanta Fig. 153.—Galls of Biorhiza aptera. 156 FOREST ENTOMOLOGY. Tbras terminalis (Fabr.) Tbe gall of this species (fig. 154) is the well-known oak-apple orKing Charles apple, which is worn by country boys in the south ofEngland on the 29th May. When first the oak-apple appears, it isof a very beautiful scarlet colour. On making a longitudinal ortransverse section, we find that the interior of the gall is many-chambered, and the outside soft, spongy, and rich in tannin. The gall matures in June, and the flies emerge in J uly. This being th
Forest entomology . Fig. 152.—Galls o/ Diyo-phanta Fig. 153.—Galls of Biorhiza aptera. 156 FOREST ENTOMOLOGY. Tbras terminalis (Fabr.) Tbe gall of this species (fig. 154) is the well-known oak-apple orKing Charles apple, which is worn by country boys in the south ofEngland on the 29th May. When first the oak-apple appears, it isof a very beautiful scarlet colour. On making a longitudinal ortransverse section, we find that the interior of the gall is many-chambered, and the outside soft, spongy, and rich in tannin. The gall matures in June, and the flies emerge in J uly. This being the case, and considering that thegall is abundant and common, itis very easily reared. With regard to the fly, I havemade from microscopical observa-tions the following notes :— Length of body 2 mm.; breadthor expanse of wings 5 mm.; wingsslightly pubescent, with shorthairs; head and thorax brownish ;abdomen considerably narrowerthan thorax, blackish, shining,egg - shaped, and pointed; eyesblack and shining; three ter-minal joints of antennae moreslende
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