Knowledge; A Monthly Record of Science Volume 14

Knowledge; A Monthly Record of Science Volume 14

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1891 edition. Excerpt: ...which those of the male naturally exhibit is unfortunately destroyed because the insects have been preserved in balsam, and it is impossible then to ensure that appendages so delicate should be spread out with all the hairs in proper position; no conception, therefore, of their great beauty can be formed from a specimen so preserved. The greatest interest, of course, attaches to the proboscis, for herein are contained the weapons of attack. In this, again, the sexes differ greatly, and it is against the female tnly that the charge of blood-sucking can bo substantiated. The male is an inoffensive creature, and usually remains in his native haunts, not invading our apartments; for it must be remembered that these flies, like those treated of before, pass their early stages out of doors and enter our houses only when fully grown. The straight, cylindrical spike projecting from the head, though itself no thicker than a hair, is a tube, or rather trough, terminated by two small fleshy lips, the dwarfed representatives of the two large folding leaves which terminate the proboscis of the blow-fly. This tube represents the labium of the normal insect's mouth, and concealed within it lie the much finer piercing organs; for the socalled " bite," like that of the bed-bug, consists really of a boring and sucking operation. Along by the upper slit of the trough lies a long bristle-shaped organ, which represents the labrum, or upper lip, and of course all the rest of the mouth organs, except the palpi, lie between this and the labium, i.e., in the trough of the latter. The mandibles and maxilla?, which in insects that feed on solid food are efficient biting weapons, are here, as in the bed-bug, replaced by four fine-pointed, needle-like...show more

Product details

  • Paperback | 238 pages
  • 189 x 246 x 13mm | 431g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236958888
  • 9781236958884