. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. 486 OTHER BLOOD-SUCKING FLIES. Fig. 225. Mouthparts of a tabanid; hyp., hypopharynx; lab., labium; label., labellum; labr, ep., labrum-epipharynx; mand., mandible; max., maxilla; max. p., maxillary palpus. deliberate and persistent in their feeding and are not easily dis- turbed when they have begun to suck blood. The thorax is relatively long, and the wings are large and expansive and usually held at a broad angle to the body, as shown in Fig. 227. The markings of the wings usually give the easiest mea
. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. 486 OTHER BLOOD-SUCKING FLIES. Fig. 225. Mouthparts of a tabanid; hyp., hypopharynx; lab., labium; label., labellum; labr, ep., labrum-epipharynx; mand., mandible; max., maxilla; max. p., maxillary palpus. deliberate and persistent in their feeding and are not easily dis- turbed when they have begun to suck blood. The thorax is relatively long, and the wings are large and expansive and usually held at a broad angle to the body, as shown in Fig. 227. The markings of the wings usually give the easiest means of identi- fication of the genera. Of the four most important genera as human pests, Tabanus (Fig. 224) is of large size and has clear or smoky wings, with no spots or a few small scat- tered ones; Pangonia (Fig. 226) also has clear or smoky wings but can be distinguished by the long proboscis; Hcematopota is of moderate size and has wings with profuse scroll-like markings; and Chrysops, the species of which are often small, even smaller than a housefly, has a con- spicuous black band on the wing (Fig. 227). Life History.—All the tabanids breed in water or in damp places. The eggs (Fig. 224C), several hundred in number, are laid in definitely shaped masses on the leaves of marsh or water plants, on the leaves or twigs of trees overhanging water, or in crevices of Fig. 226. A long-beaked tabanid, Pmigonia rocks along the sides of ''"PP^"**i oi eastern Africa. X 2. (After Castel- , _-, lani and Chalmers.) streams, ine eggs are white when laid, but soon turn dark. They are deposited during the summer and under favorable circumstances hatch in from five to seven days. The newly hatched larvae fall into the water or to wet ground or decaying vegetation such as occurs around the edges of marshes, in sphagnum bogs, in decaying logs, etc. The larvae (Fig. 224D) are cylindrical legless creatures, pointed at. Please note that these images are extracted from scanned page im
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