Forest entomology . Fig. 150.—Gall of Dryophantascutellaris (cherry gall).. Fig. 151.—Gulls of Dryophanta longiventris. species are found on the roots HYMENOPTERA—OAK GALLS. 155 very often be found by workmen when trenching or uprooting trees inwinter. They are of a coffee-brown colour, and vary in size, but theaverage is about the bulk of a common pea(fig. 153). They are generally procured inclusters, which very much resemble the honey-combs of the moss-bee, Bornbus says that, after many observations, hefound that the flies issue in December andJanuary, but adds that other obse
Forest entomology . Fig. 150.—Gall of Dryophantascutellaris (cherry gall).. Fig. 151.—Gulls of Dryophanta longiventris. species are found on the roots HYMENOPTERA—OAK GALLS. 155 very often be found by workmen when trenching or uprooting trees inwinter. They are of a coffee-brown colour, and vary in size, but theaverage is about the bulk of a common pea(fig. 153). They are generally procured inclusters, which very much resemble the honey-combs of the moss-bee, Bornbus says that, after many observations, hefound that the flies issue in December andJanuary, but adds that other observers foundthe time of their appearance rather last remark I can quite endorse, 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 reg
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