MUSCID^: THE BLOOD-SUCKING MUSCIDiE 169 



Last 2 segments of tarsus of front and middle legs either 

 entirely pale, or at most faintly brownish — never dark 

 or black — distally G. pallidipes. 



'Third antennal segment with a distinct fringe of fine 

 hair on front margin. Abdominal cross-bands 

 extending close to the hind margins of the seg- 

 j ments G. longipalpis. 



Third antennal segment without a distinct anterior 

 fringe of hair. Abdominal cross-bands not extend- 

 ' ing close to the hind margins of the segments 



G. morsitans. 



In the males of the G. morsitans group, as Newstead has 

 demonstrated, the large claspers are spatulate, and are con- 

 nected with one another, not only by a membranous curtain 

 but also by a phalange-like extension of their inner border. 



(c) Synopsis of the Species of the Glossina fusca Group : 

 after Austen. 



I. Third segment of antenna fringed with iine hair on 

 anterior and posterior margins ; fringe on anterior 

 margin conspicuous under a hand-lens magnifying 15 

 diam. (nominal) when head is viewed in profile = 2. 



Third segment of antennas with the fringe of fine hair on the 

 anterior margin so short as to be scarcely noticeable 

 under a hand-lens magnifying 15 diam. (nominal) when 

 head is viewed in profile — the length of the longest 

 hairs of the fringe not exceeding one-sixth the width of 

 the segment. Palpi long and slender = 3. 



'Length of the longest hairs of the fringe in question 

 equal to from one-fourth to one-third the width of 

 the segment specified. Palpi of moderate length 



G. tabaniformis. 



Length of the longest hairs of the fringe equal to from 



one-half to three-fourths the width of the segment. 



Palpi noticeably long and slender G. nigrofusca. 



'Pleura drab-grey or Isabella-coloured. Hind coxae 



buflf or greyish buff G. fusca. 



Pleura dark grey. Hind coxae mouse-grey 



G. fuscipleu ris. 



