. Annual report, including a report of the insects of New Jersey, 1909. Fig. 321.—The sheep-bot, CEstrus ovis: T, flies, wings closed and open; j, pupa; 4, 5, full grown larvae; 6, young larva. Family TACHINID.^. The Tachina flies are almost all parasitic and of the very highest use- fulness, since they form the chief control of many caterpillars. They resemble house-flies, flesh-flies, and blue-bottles in appearance, but are much more bristly; sometimes formidable-looking from the array of sharp points projecting in every direction. The bristle on the third antennal joint is always bare, and
. Annual report, including a report of the insects of New Jersey, 1909. Fig. 321.—The sheep-bot, CEstrus ovis: T, flies, wings closed and open; j, pupa; 4, 5, full grown larvae; 6, young larva. Family TACHINID.^. The Tachina flies are almost all parasitic and of the very highest use- fulness, since they form the chief control of many caterpillars. They resemble house-flies, flesh-flies, and blue-bottles in appearance, but are much more bristly; sometimes formidable-looking from the array of sharp points projecting in every direction. The bristle on the third antennal joint is always bare, and this is the best char- acter for the recognition of the family. These flies often lay their eggs on the outside of the caterpillar, usually just back of the head, where the larvas cannot easily get at them. They are white in color and quite large enough to be easily seen. Cut-worms are a common prey of these flies; sometimes of hundreds of such larva gathered not two per cent, will be free of these white eggs. In an army worm year sometimes scarcely one per cent, of the last brood is free. Anywhere from one to 100 grubs may infest a single caterpillar, depending upon the size of the host. GYMNOCLYTIA B. & B. (CISTOGASTER.) G. immacuiata Macq. Westville VI, 26 (Jn); Glassboro VII, 8 (CG); Clementon V, 30, IX, 5 (Hk). G. occidua Walk. Dover VI, 17, Chester VII, 25, Westville, Atco VII, 12 (Jn); Middlesex Co. VII, 7, Jamesburg VII, 4 (Sm).. Fig. 422.—Tachinid parasite on cut-worms showing larva, pnpa and adult, as well as the eggs on the anterior segments of a caterpillar. GYMNOSOMA Meig. G. fuliginosa Desv. Caldwell (Cr); WoodbuiT VI, 7, Clementon VIII, 8, Buena Vista VI, 11, Anglesea VII, 19 (Jn).. 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 New Jersey state museum. [from old catalog].
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Keywords: ., bookcentury1900, bookcontributorthe, bookdecade1910, bookyear1910
