Forest entomology . pecies of the Aphilothrix group are notassociated by Adler as connected with the alternation of generations,but are nevertheless more or less common. Aphilothrix quadrilineata (Htg.) The gall of this species, fig. 146, is found on the flowering catkinsabout the end of May or beginning of June. It is very small in size, 152 FOREST ENTOMOLOGY. and may not inaptly be compared to a miniature rifle-bullet withlongitudinal ridges added on. I have not succeeded in rearing the fly, which Adler says is verydifficult, and does not appear until the following April. It is verycommon in
Forest entomology . pecies of the Aphilothrix group are notassociated by Adler as connected with the alternation of generations,but are nevertheless more or less common. Aphilothrix quadrilineata (Htg.) The gall of this species, fig. 146, is found on the flowering catkinsabout the end of May or beginning of June. It is very small in size, 152 FOREST ENTOMOLOGY. and may not inaptly be compared to a miniature rifle-bullet withlongitudinal ridges added on. I have not succeeded in rearing the fly, which Adler says is verydifficult, and does not appear until the following April. It is verycommon in Alnwick parks. Aphilothrix albopunctata (Schltdl.) The gall of this species is a very pretty little object, and isformed in the bud (fig. 147). It somewhat resembles a smallacorn. It is green, spotted with red, andis about 5 to 6 mm. long. The larvae aregregarious, and tbe gall is not galls were very common in HighLegli, Cheshire, and were found in flies hatched out about June of thesame Andricus ramuli (Linn.) This gall is known as the cotton gall, as itoccurs on the flower and resembles a ball ofcotton-wool (fig. 148). The hairs are inter-woven so as to form a sort of felt. The gallsare many-chambered, or polythalamous. Thisis by no means a very common gall. I havefound it twice, — once in Wales, in June 1901, and again in the Alnwick parks, July 1898. The flies hatch out in July. Fig. 147.—Galls of Aphil-othrix albopunctata. Aphilothrix fecundatrix, Htg. (Adler).Andricus feeundatrix, Mayr (Cameron). This gall is known as the artichoke gall. It very much resemblesa hop-flower, with imbricated scale. At first it is of a green colour,but becomes brown with age. In collecting those galls when maturemuch care is necessary to obtain the imagines. The real gall is asmall acorn-shaped body within these scales, but so very loosely HYMENOPTERA—OAK GALLS. 153 attached that, if not careful, our hop-like galls may be nothing elsebut empty husks (fig. 1
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