Forest entomology . year. BlOEHIZA RENUM (Htg.) This is a kidney-shaped gall, as the name implies (fig. 155). It isnot very common, but when found is generally abundant on the under side of the leaves, andarranged in rows attachedto the veins. It is foundin September and October,but though I found it sev-eral consecutive years in aCheshire lane, I yet failedto rear a single fly, —which is described as wing-less, and of a brownish-redcolour. By experimental breed-ing Adler found the flyalternated with Trigox- ASPIS MEGAPTERA (aUSt- alis), which is found onadventitious buds on oldoak stems near
Forest entomology . year. BlOEHIZA RENUM (Htg.) This is a kidney-shaped gall, as the name implies (fig. 155). It isnot very common, but when found is generally abundant on the under side of the leaves, andarranged in rows attachedto the veins. It is foundin September and October,but though I found it sev-eral consecutive years in aCheshire lane, I yet failedto rear a single fly, —which is described as wing-less, and of a brownish-redcolour. By experimental breed-ing Adler found the flyalternated with Trigox- ASPIS MEGAPTERA (aUSt- alis), which is found onadventitious buds on oldoak stems near the gall is about the sizeof a large pea, of a beauti-ful pink colour, soft andsucculent. This gall may be first observed towards the latter end ofApril, and by the middle of May Ave find it fully matured, and theinsects hatching out. It is very generally distributed throughout thecountry, but is not always equally abundant every year. Thus in1893 it was very common, but comparatively rare in 1894 and in. Fig. 155.—Galls o/Biorhiza renum (kidney gall). 158 FOREST ENTOMOLOGY. 1895, and again fairly abundant in 1896. In 1897 I found one aslate as May 23 in Cheshire, and it hatched out next day. It may befound either singly or in masses, and each gall is single-chambered. The perfect insect is one of the prettiest of the gall-flies. The headand thorax are black, and abdomen of a bright shining wings are considerably longer than the body, and the generalappearance handsome and slender. Having observed that the fly fromB. renurn on the leaves was apterous, contrasted with long-winged flies from Trigonaspis megaptera,it may be observed in passingthat the apterous flies deposittheir eggs on adventitious budson the stem from one to threefeet from the ground. There is another curiouspoint worthy of gives Trigonaspismegaptera as the agamic form,and Biorhiza renurn as thesexual. Adler, on the otherhand, gives Trigonaspis meg-aptera as the sexual
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