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 . 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. 10«.) The Editors of the•vAmerican Entomolo-gist describe and fig-ure the Apple rootplant-louse. Eriownini(Pemphigus) pyri ofFitch (Fig. f»-_>r, ; : /;, larva : c, fe-male ; rf, leg ; , beak ; /, antenna of female

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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 . 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. 10«.) The Editors of the•vAmerican Entomolo-gist describe and fig-ure the Apple rootplant-louse. Eriownini(Pemphigus) pyri ofFitch (Fig. f»-_>r, ; : /;, larva : c, fe-male ; rf, leg ; , beak ; /, antenna of female ; Fig. :>-2i. r/, 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 EuropeanChennes (Pemphi-gus) abietis has twosorts of females,and is parthenogen-ous, according

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Keywords: ., bookcentury1800, bookdecade1870, bookpublishe, booksubjectinsects