. Entomology for medical officers. Insect pests; Insects as carriers of disease. 202 ENTOMOLOGY FOR MEDICAL OFFICERS or burred near the tipâare long, pointed bristles, and it is with these that the bug usually sucks. The mandibles are longitudinally grooved along their opposed surfacesâthe groove being " double-barrelled"âso that when they are apposed two tubes are formed, down one of which the saliva runs while the desired juice is sucked along the other. The maxillae embrace and support the mandibles. The labrum is present, but is quite short. All 3 thoracic segments are distinct,
. Entomology for medical officers. Insect pests; Insects as carriers of disease. 202 ENTOMOLOGY FOR MEDICAL OFFICERS or burred near the tipâare long, pointed bristles, and it is with these that the bug usually sucks. The mandibles are longitudinally grooved along their opposed surfacesâthe groove being " double-barrelled"âso that when they are apposed two tubes are formed, down one of which the saliva runs while the desired juice is sucked along the other. The maxillae embrace and support the mandibles. The labrum is present, but is quite short. All 3 thoracic segments are distinct, though the posterior segments are often more or less hidden by the hardened bases of the front wings. The prothorax is free, and the mesothorax is commonly produced behind to form a scutellum. The abdomen is commonly flat, and its lateral margins are often produced to form a sort of thin shelf or Fm. 85.âMouth-parts of Bed-bug, dissociated. The odour emitted by many bugs comes from the secretion of certain glands which, in the adult, open on the sternum of the last thoracic segment. There are two distinct suborders of Rhynchota, namely, the Heteroptera (ere/oo? = diverse, and â 7rTep6u = a. wing), in which the front wings, when present, are hardened at base to form wing-covers or elytra, and the beak is merely reflexed; and the Homoptera { = one and the same, and TTTepov), in which the wings, when present, are of one consistence, and the beak is so much bent under that it appears to spring from the posterior border of the head. Rhynchota Heteroptera. This suborder includes the true bugs. The hardened basal part of the front wing is known as the elytrum. 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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