. Bulletin - United States National Museum. Science. 96 BULLETIN 67, UNITED STATES NATIONAL Fig. 149.—A scale insect, Chionaspis furfuruk: a, Female scales; 6, male scales; c, female enlarged; d, male enlarged. margin of the scales so that they will lie flat upon the slides. Great care must be exercised to secure a good mount of such soft-bodied scales as the mealy-bugs, it be- ing necessary to float the speci- mens onto the slide and handle them with extreme care to pre- vent them from curling and fold- ing. Canada balsam having been placed on the insect and the cover glass applied,
. Bulletin - United States National Museum. Science. 96 BULLETIN 67, UNITED STATES NATIONAL Fig. 149.—A scale insect, Chionaspis furfuruk: a, Female scales; 6, male scales; c, female enlarged; d, male enlarged. margin of the scales so that they will lie flat upon the slides. Great care must be exercised to secure a good mount of such soft-bodied scales as the mealy-bugs, it be- ing necessary to float the speci- mens onto the slide and handle them with extreme care to pre- vent them from curling and fold- ing. Canada balsam having been placed on the insect and the cover glass applied, the slide is heated as in mounting the dia- spine scales. Sometimes it is desirable to stain the specimens. This should be done while the insect is im- mersed in alcohol, or at least before xylol or clove oil is ap- plied. One of the very best stains which has been used for this purpose is ordinary carmine ink, which can be used in conjunction with weak alcohol. Another method of mounting the insects in situ for superficial examination was originated by Prof. Herbert Osborn, of the Ohio State University. Diaspine scales or any flat scale insects when perfectly dry can be readily mounted between two strips of mica of the same dimensions as the ordinary microscope slide with the passe-partout method—i. e., the edges of the mica are sealed by means of gummed strips. Specimens mounted in this way are available for eas}r examination, and can be filed along with the ordinary slide mounts. The Anoplura, or lice, may be collected on the domestic and wild animals and should always be mounted in balsam on slides. ORTHOPTERA. A large number of Orthoptera can be obtained by sweeping meadows and herbage. Many of the crickets occur on the ground; others are to be found on shrubbery. Roaches (fig. 11) are found under loose bark of trees, among rotten logs and fallen leaves. Most of them found are young, but by looking at different times one will find the winged ones, usually in May or Jun
Size: 1601px × 1560px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
