. Entomology for medical officers. Insect pests; Insects as carriers of disease. 238 ENTOMOLOGY FOR MEDICAL OFFICERS less and have rudimentary elytra; others {CantharincB) are winged and are commonly found on flowers. Cantharis vesicatoria is the blister-beetle of the , but many other species of the family have vesicant properties. (b) TenebrionidcB. A large family of dull-coloured beetles, several of which are known all the world over as extremely destructive to stored grain and meal. The commonest species is Tenebrio molitor, whose larva is the well-known meal-worm. Both larva and adult
. Entomology for medical officers. Insect pests; Insects as carriers of disease. 238 ENTOMOLOGY FOR MEDICAL OFFICERS less and have rudimentary elytra; others {CantharincB) are winged and are commonly found on flowers. Cantharis vesicatoria is the blister-beetle of the , but many other species of the family have vesicant properties. (b) TenebrionidcB. A large family of dull-coloured beetles, several of which are known all the world over as extremely destructive to stored grain and meal. The commonest species is Tenebrio molitor, whose larva is the well-known meal-worm. Both larva and adult work havoc among the stores of millers, corn-chandlers, and bakers. The larva looks very much like a wire-worm, having the same long, stiff, cylindrical body, and the same yellowish-brown colour;. FiQ. 106,—Tniolinm ferrugineum, from damaged grain. it is composed of a head with the usual appendages, and of 12 body-segments, each of the first 3 of which has a pair of very short legs; when full grown it is more than an inch long. The adult, which is a little more than half an inch long, is shaped very much like Tribolium (Fig. 106), but is almost black in colour. Another species which has been spread widely in cargoes of grain is Tribolium ferru- gineum (Fig. 106), the adult of which is reddish-brown in colour, and less than a quarter of an inch long. Gnathocerus cornutus, another grain-pest, is much like Tribolium, but the male has enormous curved mandibles, which project like horns. Of the Phytophaga also two families require notice:—. 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 Alcock, A. (Alfred), 1859-1933. London, Gurney & Jackson
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Keywords: ., bookcentury1900, bookdecade1910, bookpubl, booksubjectinsectpests
