. Handbook of medical entomology. Insect pests; Insects as carriers of disease; Medical parasitology. The Bed-bugs 87 The Bed-bugs—The bed-bugs are characterized by a much flat- tened oval body, with the short, broad head unconstricted behind, and fitting into the strongly excavated anterior margin of the thorax. The compound eyes are prominent, simple eyes lacking. Antennas four-jointed, the first segihent short, the second long and thick, and the third and fourth slender. The tarsi are short and three seg- mented. It is often assimied in the literature of the subject that there is but a sing
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. Handbook of medical entomology. Insect pests; Insects as carriers of disease; Medical parasitology. The Bed-bugs 87 The Bed-bugs—The bed-bugs are characterized by a much flat- tened oval body, with the short, broad head unconstricted behind, and fitting into the strongly excavated anterior margin of the thorax. The compound eyes are prominent, simple eyes lacking. Antennas four-jointed, the first segihent short, the second long and thick, and the third and fourth slender. The tarsi are short and three seg- mented. It is often assimied in the literature of the subject that there is but a single species of Cimex attacking man, but several such species are to be recognized. These are distinguishable by the characters given in Chapter XII. We shall con- sider especially Cimex lectularius, the most common and widespread species. Cimex lectularius (= Acanthia lectularia, Clinocoris lectularius), is one of the most cosmopolitan of human parasites but, like the lice, it has been comparatively little studied until recent years, when the possibility that it may be concerned with the transmission of various diseases has awakened interest in the details of its life-history and habits. The adult insect (fig. 70) is 4-5 mm. long by 3 mm. broad, reddish brown in color, with the beak and body appendages lighter in color. The short, broad and somewhat rectangular head has no neck-like constriction but fits into the broadly semilunar prothorax. The four segmented labium or proboscis encloses the lancet-like maxillse and mandibles. The distal of the four antennal segments is slightly club-shaped. The prothorax is characteristic of the species, being deeply incised anteriorly and with its thin lateral margins somewhat turned up. The mesothorax is triangular, with the apex posteriorly, and bears the greatly atrophied first pair of wings. There is no trace of the metathoracic pair. The greatly flattened abdomen has eight visible segments, though in reality the first is greatly reduce