A preliminary introduction to the study of entomologyTogether with a chapter on remedies, or methods that can be used in fighting injurious insects; insect enemies of the apple tree and its fruit, and the insect enemies of small grains . Fig. 153.—Caddis Fly: a. case; b, larva; c. pupa.—[a, 6, d. after Packard; c, after Hyattand Arms.] the cases are sufficiently permanent in form with these insects to per-mit of their being used as a means for classifying the larval forms. The Caddis Flies, as the perfect insects are called, resemble some ofthe moths in their general appearance. They have the
A preliminary introduction to the study of entomologyTogether with a chapter on remedies, or methods that can be used in fighting injurious insects; insect enemies of the apple tree and its fruit, and the insect enemies of small grains . Fig. 153.—Caddis Fly: a. case; b, larva; c. pupa.—[a, 6, d. after Packard; c, after Hyattand Arms.] the cases are sufficiently permanent in form with these insects to per-mit of their being used as a means for classifying the larval forms. The Caddis Flies, as the perfect insects are called, resemble some ofthe moths in their general appearance. They have the wings providedwith but few cross-veins, and more or less thickly covered with hairs,hence the name Trichoptera which signifies hair-wings, The headis small, with widely separated eyes; the three thoracic rings are distinct,the meso-thorax being largest in conformity with the greatest use of thefront wings in flight. The mouth-parts, although of the biting type, aresmall and weak, the insects probably taking but little, if any, food in thisstage. It has been observed that some of the more delicate white formsfound here in Nebraska show indications of having their abdomen moreor less filled with green vegetable matter. The ante
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectinsects, bookyear1894
