Natural history of animals; . Fig. 2S9. — Asilus Fly Fig. 290. — Horse Botfly. of the water, and breathe through two tubes on thethorax. In a few days the skin splits on the back, thewinged insect appears, and, after resting awhile on itsempty skin as it floats upon the water, spreads itswings, and, flies away in search of a victim. Hessian Fly and Wheat Fly. The Hessian Fly expands about one fourth of aninch, and has the head, antennae, and thorax black,the wings blackish and fringed with short hairs. Thehind body is tawny, with black on each ring; the legsare brownish, and feet black. Two br
Natural history of animals; . Fig. 2S9. — Asilus Fly Fig. 290. — Horse Botfly. of the water, and breathe through two tubes on thethorax. In a few days the skin splits on the back, thewinged insect appears, and, after resting awhile on itsempty skin as it floats upon the water, spreads itswings, and, flies away in search of a victim. Hessian Fly and Wheat Fly. The Hessian Fly expands about one fourth of aninch, and has the head, antennae, and thorax black,the wings blackish and fringed with short hairs. Thehind body is tawny, with black on each ring; the legsare brownish, and feet black. Two broods appear in a. 170 ARTHROPODS: INSECTS. year, — one in spring and one in autumn. The femaleslay their eggs on the young blades of wheat, both inspring and fall. The eggs are only about one fiftiethof an inch in length, pale red, andthey hatch in about four days, pro-ducing pale red maggots. Thelarvae immediately crawl down theleaf till they come to a they rest a little below thesurface of the ground till they haveundergone their transformations. They injure the plant by suckingFig. Fly. its sap> The jarvae reach their growth in five or six weeks, and are then covered with ahardening, brown or chestnut-colored skin, and the insectis then said to be in the flaxseed state, from its resem-blance to a flaxseed. In April and May they completetheir transformations, come forth in the winged state,and soon begin to lay their eggs upon the spring wheat,and upon that sown the autumn before. The maggotshatched from these eggs pass down the stem as beforestated, take the flaxseed for
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
