DETEEMINATION OF SPECIES. 21 



11. 



Glossina morsitans Group. 



Last two joints of front and middle tarsi with 



sharply defined, clove-brown or black tips... 2 



Last two joints of front and middle tarsi with- 

 out sharply defined, clove-brown or black 



tips (front and middle tarsi either entirely 



pale or, at most, last two joints of front 



tarsi faintly brownish at the tips, and last 



joint and distal half of penultimate joint of 



middle tarsi light brown — never so dark as 



to form a sharp contrast with the remaining 



joints) pallidiiies, Austen. 



Third joint of antennae with a distinct fringe 



of fine hair on front margin ; dark brown 



or clove-brown bands on abdominal seg- 

 ments extending close to hind margins {i.e. 



pale ground colour, apart from the median 



interspace, confined to a very narrow hind 



border) longipalpis, Wied. 



Third joint of antennae without a distinct 



fringe of fine hair on front margin ; dark 



brown or clove-brown bands on abdominal 



segments not extending close to hind 



margins morsitans, Westw.* 



III. 



Glossina fusca Group. 



Third joint of antennae fringed with fine 

 hair on anterior and posterior margins ; 

 fringe on anterior margin conspicuous 

 under a hand-lens magnifying 15 dia- 

 meters (nominal), when head is viewed 

 in profile 2 



Third joint of antennae with fringe of fine 

 hair on anterior margin so short as to be 

 scarcely noticeable under a hand-lens 

 magnifying 15 diameters (nominal), when 

 head is viewed in profile (longest hairs in 

 fringe in length not exceeding one-sixth 

 of width of third joint) ; palpi long and 

 slender 3 



* The designation Glossina morsitans, as used in this book, includes 

 G. suhmorsitans, Newst. As explained on pp. 51-52, the author, provisionally 

 at any rate, is inclined to regard G. submorsitans, Newst., as a form or 

 race of G. morsitans, Westw., rather than as a distinct species. 



