. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. Fig. 54. Olfactory organs of Insects, fl, Transverse section through the wall of the antenna of the Cockchafer. N^ nerve; Ch^ chitinous membrane; <?, ganglion-cell of the sensory cone {Sk) sunk in a pit. b. Section through the antenna of Cetonia aurata. References as in a. (After O. vom Rath.) such cones. The sensory hairs are large, pale, chitinous tubes, which are generally somewhat curved, and more or less tapering. The simple pits present a great vari
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. Fig. 54. Olfactory organs of Insects, fl, Transverse section through the wall of the antenna of the Cockchafer. N^ nerve; Ch^ chitinous membrane; <?, ganglion-cell of the sensory cone {Sk) sunk in a pit. b. Section through the antenna of Cetonia aurata. References as in a. (After O. vom Rath.) such cones. The sensory hairs are large, pale, chitinous tubes, which are generally somewhat curved, and more or less tapering. The simple pits present a great variety in structure and are generally distributed, while the pits with many sensory cones are found only in certain genera. Hawk-moths possess the most specialized olfactory organs, and Kerner (cf. p. 125) has made observations with regard to the delicate sense of smell possessed by these insects. Upon the antennae of Beetles are to be found superficial sensory cones and sensory bristles, together with membranous canals and chitinous pits (Fig. 54). The number of these little sensory pits is par- ticularly large in carrion-loving beetles (Silpha, Necrophorous, Staphylinus, &c.). In the cock- chafer there are 39,000 such pits on the antennae of the male, and 35,000 on those of the female. No pits have hitherto been found in the Carabidae, Cerambycidae, Chr\'somelidac, Curculionidae, and Cantharidac. Hymenoptera possess membranous canals, various forms of cone, and pointed sensory hairs (Fig. 55). Besides these structures, Forel has found ' flasks '' and ' champagne-cork organs ' in the skin of Anis, Humble-bees, and Bees. These also are of sensory nature. The ' cham- pagne-cork organs' of humble-bees and bees are confined to the terminal 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 Knuth, Paul, 18
Size: 1537px × 1626px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisheroxfor, bookyear1906
