. Economic entomology for the farmer and fruit-grower . Ideal section through an insect.—a, alimentary canal; h, heart; n, nerve-cord ; s, stig- mata ; t, tracheal tubes ; /, legs ; w, wings. depending considerably upon the kind of insect in hand. Just below the dorsal surface is a small tubular structure, at once the heart and only blood-vessel, while just above the ventral surface is a white, knotted cord,—the nervous system. Laterally, there is an opening on each side, from which a ringed tube leads into the body, dividing and subdividing almost immediately into innumerable branches, and th
. Economic entomology for the farmer and fruit-grower . Ideal section through an insect.—a, alimentary canal; h, heart; n, nerve-cord ; s, stig- mata ; t, tracheal tubes ; /, legs ; w, wings. depending considerably upon the kind of insect in hand. Just below the dorsal surface is a small tubular structure, at once the heart and only blood-vessel, while just above the ventral surface is a white, knotted cord,—the nervous system. Laterally, there is an opening on each side, from which a ringed tube leads into the body, dividing and subdividing almost immediately into innumerable branches, and this is the respiratory or breathing system. Frequently we find around the alimentary canal a con- siderable fatty mass, while everywhere through the insect body
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbenefic, bookyear1906
