Forest entomology . dorse, inas-much as galls found by workmen in Februarydid not hatch until well on in spring. Inthis case there is no mistaking the species orconfounding with parasites, inasmuch as thespecimens are all apterous. The fly varies in size from 4 to 7mm. long, wingless, with a rather slenderthorax. The form is somewhat spider-like,and the whole body of a uniform brownishcolour. With regard to the alternate form, Adlermade many observations, and found that theeggs deposited by Biorhiza aptera result in the formation of thewell-known oak-apple. Adler watched the egg-laying process
Forest entomology . dorse, inas-much as galls found by workmen in Februarydid not hatch until well on in spring. Inthis case there is no mistaking the species orconfounding with parasites, inasmuch as thespecimens are all apterous. The fly varies in size from 4 to 7mm. long, wingless, with a rather slenderthorax. The form is somewhat spider-like,and the whole body of a uniform brownishcolour. With regard to the alternate form, Adlermade many observations, and found that theeggs deposited by Biorhiza aptera result in the formation of thewell-known oak-apple. Adler watched the egg-laying process very closely, and found thatthe insect did not de-posit the egg immed-iately after making theincision, but acted onthe principle of onething at a time, inas-much as she carefullypricked the buds andthen returned to depositthe eggs in previouslyprepared channels. Inthis way he found thaton January 27, 1878, the fly deposited 582 eggs during 87 the end of May these galls were fully developed Fig. 152.—Galls o/ Diyo-phanta rtivisa.
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