. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. THE BUrXEKFLY 59 and the same leaf, the gaUs wiU be uiihke. Hence the char- acteristic form of the gall is determined both by the species of plant and l)y the species of insect which lives in it. It is interesting to collect galls, watch for the emerg- ing wasps, determine their species, and thus get their entire life history. The gall-wasps are, on the whole, injurious to agriculture. The plant-eating Hymen- optera are extremely de- structive pests. The young are known as " slugs," from their res
. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. THE BUrXEKFLY 59 and the same leaf, the gaUs wiU be uiihke. Hence the char- acteristic form of the gall is determined both by the species of plant and l)y the species of insect which lives in it. It is interesting to collect galls, watch for the emerg- ing wasps, determine their species, and thus get their entire life history. The gall-wasps are, on the whole, injurious to agriculture. The plant-eating Hymen- optera are extremely de- structive pests. The young are known as " slugs," from their resemblance to the true slugs, which are snail- hke animals. They infest pear trees and rose bushes, leaving scorched, dried leaves behind them.' Here also belong the currant-worm and the sawflies (Figs. 64 and ), which eat leaves like caterpillars, but differ from them in having twelve or sixteen prolegs instead of ten. 1 See " The Pear Slug," in Circular No. 26, 2d Series, U. S. Department of Agriculture, Division of Fig. 65. — Egga of Nematus, a sawfiy on a gooseberry leaf. Photo, by V. H. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Davenport, Charles Benedict, 1866-1944; Davenport, Gertrude Anna Crotty, 1866- joint author. New York, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1911
