84 G. TABANIFOEMIS : DISTINCTIVE CHAEACTEES. 



Affinities and Distinctive Characters. 



So far, at least, as regards external characters, Glossina 

 tahaniformis may be distinguished from G. nigrofusca, Newst. 

 (p. 77), G.fusca, Walk. (p. 69), and G. fuscipleuris, Austen (p. 75) 

 — the three other species of the Glossina fusca group at present 

 known, by the comparative shortness of its palpi ; the length of 

 the fringe of hair on the front border of the third joint of the 

 antennae will also serve to distinguish G. tahaniformis from 

 G. nigrofiisca on the one hand, and from G. fusca and fuscipleuris 

 on the other. The general resemblance of both G. nigrofiisca and 

 fusca to G. tabaniformis is certainly very strong, and it is possible 

 that either the first or last mentioned species may ultimately 

 prove to be a form of G. fusca, Walk. ; in order to decide this 

 question, however, a comparison of the male genital appendages is 

 essential, and for this purpose the material at present available 

 is insufficient in the case of G. tahaniformis. 



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