. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. INSECT VISITORS T39 while the ' flasks' occur in various parts on the distal joints. Such ' flasks' are found in Apis, Bombus, Eucera, Xylocopa, and Anthophora. The olfactory pits and olfactory cones vary greatly in number. In honey-bees there are 14,000 to 15,000 pits, and some 200 cones on each antenna. Among Diptera there are chitinous pits containing sensory cones, and of very varied forms. The pits are sometimes simple, with only one cone; sometimes com
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. INSECT VISITORS T39 while the ' flasks' occur in various parts on the distal joints. Such ' flasks' are found in Apis, Bombus, Eucera, Xylocopa, and Anthophora. The olfactory pits and olfactory cones vary greatly in number. In honey-bees there are 14,000 to 15,000 pits, and some 200 cones on each antenna. Among Diptera there are chitinous pits containing sensory cones, and of very varied forms. The pits are sometimes simple, with only one cone; sometimes compound, with a larger number (up to 100) of cones. The Tipulidae possess isolated cones only, while both kinds are present in Tabanidae, Asilidae, Bomby- liidae, Leptidae, Dolichopodidae, and Stratiomyidae. In the other families there are only aggregated cones. In the flesh-flies and dung-flies there are 60 to 150 pits, in Trypeta and others only 2 to 5 on each antenna. A few of the Neuroptera, Orthoptera, and Hemiptera also possess pits or sensory cones on the antenna. The centre of the olfactory sense of insects is to be sought at the base of the antennary nerve. At its point of origin occur peculiar rounded masses, the olfactory bodies, which are so described. As there is a well-developed sense of taste in many insects, it may be deduced that they also possess special gtistalory organs, since in the case of odourless substances taste is only possible when these are touched by the mouth-parts of the insect, its seat must be in the region of the mouth. Sensory pits with nerve-endings are actually found (Kolbe, op. cit., pp. 442-5) both in the walls of the mouth-cavity as well as on the tongue and palps. These must at once come into contact with the food that is taken. On the proboscis of a fly, for example, organs of taste are found, together with tactile hairs. The interior of the tubular proboscis of a butterfly or moth is regularly beset with small chitinous cylinders, which
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