. Elementary entomology. Entomology. Fig. 481. Showing method of pinning Orthoptera (After Washburn) although some entomologists spread the wings on both sides. The front margins of the hind pair of wings should be at right angles to the body, the front pair being brought forward until they just touch the hind pair. Platyptera. White ants are usually mounted in alcohol, or on microscope slides, although the winged forms may be pinned through the metathorax. The wings are seldom spread. Book- lice are mounted either on points or on microscope slides, while bird-lice are invariably mounted on mi
. Elementary entomology. Entomology. Fig. 481. Showing method of pinning Orthoptera (After Washburn) although some entomologists spread the wings on both sides. The front margins of the hind pair of wings should be at right angles to the body, the front pair being brought forward until they just touch the hind pair. Platyptera. White ants are usually mounted in alcohol, or on microscope slides, although the winged forms may be pinned through the metathorax. The wings are seldom spread. Book- lice are mounted either on points or on microscope slides, while bird-lice are invariably mounted on microscope slides. Earwigs are mounted on points, or, in the larger forms, the pin is inserted through the anterior portion of the right wing-cover. Orthoptera (Fig. 481). In the ordinary grasshopper, and in those forms having the prono- tum well developed, the pin is usually inserted through the posterior margin of the pronotum. In forms in which the pronotum is not well developed the pin is run through the metathorax. The wings may or may not be spread, but the usual method is to spread the wings on the right side of the body. Care should be taken to arrange the legs and antennae, the latter being laid back over the body, if possible. The legs may be held in position by running the pin through a square of stiff paper, which is brought up to the proper distance and the legs kept in a natural position until dry. Hemiptera (Fig. 482). All of the larger He- miptera are pinned through the metathorax ; the smaller forms, with the exception of the Aphididae and scale insects, are mounted on points. The two latter groups require special methods of mounting. The Aphididae are frequently mounted by plac- ing them on a glass slide and covering them with a drop of Canada balsam dissolved in xylol. They are allowed to stand for twenty- four hours, when a small amount of fresh balsam is applied, and. Fig. 482. Showing method of pinning Hemiptera (After Washburn). Please note that these image
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Keywords: ., bookcentury1900, bookdecade1, booksubjectentomology, bookyear1912
