. Nature study and life. Nature study. 250 NATURE STUDY AND LIFE The smaller ichneumons (of course there are distinc- tions other than size) are now called "braconids," and the smallest, many of them not more than one one-hundredth of an inch in length, have been set apart by themselves as the Chalcis flies. The Braconids. — One of the commonest braconids is parasitic on the tomato sphinx. Others are found on the grape sphinx and the cabbage worms. Little bunches of white or yellow cocoons, often found attached to grasses and weeds, if preserved in a bottle covered with gauze, will b
. Nature study and life. Nature study. 250 NATURE STUDY AND LIFE The smaller ichneumons (of course there are distinc- tions other than size) are now called "braconids," and the smallest, many of them not more than one one-hundredth of an inch in length, have been set apart by themselves as the Chalcis flies. The Braconids. — One of the commonest braconids is parasitic on the tomato sphinx. Others are found on the grape sphinx and the cabbage worms. Little bunches of white or yellow cocoons, often found attached to grasses and weeds, if preserved in a bottle covered with gauze, will be found to contain insects of this family. One of the most interesting of these little parasites for the children to study belongs to the genus Aphidius, so named from its work with the plant lice. If colonies of aphids are examined late in the season, from July to October, many will be found lighter colored than the rest and much swollen. Often an artichoke leaf or a spray of yellow dock will have a dozen or more such specimens. Iveep a number in a glass covered with gauze, and within a few days you will find neat little trapdoors cut in the backs of the aphids and the minute parasites flying about in the Let them have golden-rod or asters and a fresh supply of plant lice in a window or large gauze cage and see who can observe them laying their eggs. Another similar parasite of the aphids emerges from the plant louse when it reaches maturity and spins a flat cocoon, using the shell of its. 104. P.^ Plant Lice (Photograph by the author). 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 Hodge, Clifton Fremont, 1859-. Boston and London, Ginn & Co.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectnatures, bookyear1902
