Guide to the study of insects and a treatise on those injurious and beneficial to crops, for the use of colleges, farm-schools, and agriculturists . ^ 6 rig. 521b. The Grape ILilloxeia. COCCIDJE. )25. lice, when the slit on the upper side of the leaf, through whichthe mother plant-louse built up the gall early in the spring,gapes open and allowsthe insects to escapeinto the open air.(American Entomolo-gist, p. 108.) The Editors of theAmerican Entomolo-gist describe and fig-ure the Apple rootplant-louse, Eriosoma(Pemphigus) pyri ofFitch (Fig. 526 ; a, thegall; h, larva; c, fe-male ; f?, leg ; c
Guide to the study of insects and a treatise on those injurious and beneficial to crops, for the use of colleges, farm-schools, and agriculturists . ^ 6 rig. 521b. The Grape ILilloxeia. COCCIDJE. )25. lice, when the slit on the upper side of the leaf, through whichthe mother plant-louse built up the gall early in the spring,gapes open and allowsthe insects to escapeinto the open air.(American Entomolo-gist, p. 108.) The Editors of theAmerican Entomolo-gist describe and fig-ure the Apple rootplant-louse, Eriosoma(Pemphigus) pyri ofFitch (Fig. 526 ; a, thegall; h, larva; c, fe-male ; f?, leg ; c, beak ;/, ^antenna of female ;g, of larva), which occurs sometimes in great abundance, form-ing, in October, galls like potatoes, and two to three inches indiameter, on the roots of apple trees, just beneath the surfaceof the ground. The EuropeanChermes (Pemphi-gus) abietis has twosorts of females,and is parthenogen-ous, according toLeuckart. CocciD^ Bark-lice havesix or more jointsto the antennae ; thetarsi are two-jointed, the beak wanting in the males, in whlcUthe hind wings are usually wanting, while the scales made bythe females are usually flattened, scale-like, or rounded he
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectinsects
