Forest entomology . nd basal half of thefemora blackish. Males and females similar in colouring. Genus Aphilothrix. The second group, according to Adler, having alternate generations,is the Aphilothrix-Andricus Group. The genus Aphilothrix includesa large number of gall-flies foundonly in the female sex. The genusAndricus yields the sexual form. 6. Aphilothrix radicis (Fabr.) This gall (fig. 140) is found onthe lower part of the trunk, or jUSt 011 the horizontal portion of FiS- ^.-GaU of Aphilothrix radicis. In ° L section to show chambers. the root above ground. At first it appears as a large
Forest entomology . nd basal half of thefemora blackish. Males and females similar in colouring. Genus Aphilothrix. The second group, according to Adler, having alternate generations,is the Aphilothrix-Andricus Group. The genus Aphilothrix includesa large number of gall-flies foundonly in the female sex. The genusAndricus yields the sexual form. 6. Aphilothrix radicis (Fabr.) This gall (fig. 140) is found onthe lower part of the trunk, or jUSt 011 the horizontal portion of FiS- ^.-GaU of Aphilothrix radicis. In ° L section to show chambers. the root above ground. At first it appears as a large softish mass, but ultimately it becomes quite hardin the centre, and a section made in mid-winter will reveal a many-chambered gall with a fully developed fly in each chamber. Theyhatch out about the latter end of April. The fly is reddish-brown, with longitudinal stripes on the abdomen is somewhat dark, and the thorax is covered with a finesilky pubescence. The antennae are dark-brown. Length from 5 to. 148 ENTOMOLOGY. 6 mm. The alternating species is 6a Andricus noduli (Htg.), whichmakes galls in the woody portions of young shoots. 7. Aphilothrix corticis (Linn.) The galls of this species are found inserted in the young barkwhich is formed where the stem has been injured, or in the tenderbark which forms in the healing over process after a branch .hasbeen sawn off (fig. 141). Sometimes they may be found in clusters,
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