The Theory And Practice of Hygiene (Notter And Firth)
The Theory And Practice of Hygiene (Notter And Firth)
James Lane Notter
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The head and thorax are black, with a dull olive- grey abdomen. Each segment has a black median blotch on the dorsum, not reaching to the hind margin of each segment, except the last. The legs are oc&aceous, with brown tarsi, also black coxab and trochanters. The wings are marked by a brown transverse band ; the halteres are dark brown. The average len^h of these flies is 9 millimetres (Plate XV.). Tabanus bovinus or the common gadfly of oxen is a familiar specimen of the genus in this country.... It is a free blood-sucker, but at * Second Report of the Wellcome Research Laboratories at Khartoam, 1906. This Report contains a valuable account of the biting flies of the Sudan by £. G. Austen, and should be consulted for det-ails. 622 THEORY AND PRACTICE OF HYGIENE present not known to be associated with the dissemination of any specific disease (Fig. 143). Tabanus dit8Biiiatus is a greyish yellow fly some 12 millimetres long, common in Central Africa from Natal to the 6ahr-el-Ghazal, and having a pair of conspicuous black dots on the front of the head.
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