XVI] CLASSIFICATION 249 



II. GLOSSINA MORSITANS group. 



1. Last two joints of front and middle tarsi with sharply denned, clove- 

 brown or black tips .. .. .. .. .. .. .. = 2. 



Last two joints of front and middle tarsi either entirely pale or, at most, 

 faintly brownish at the tips, never so dark as to form a sharp contrast with the 

 remaining joints .. .. .. .. =pallidipes, Austen (p. 271). 



2. Third joint of antennae fringed with fine hairs on front margin. The 

 dark brown transverse abdominal bands extending close to the hind margins 

 of the segments . . . . . . . . . . =longipalpis, Wied. (p. 274) 



Third joint of antennae not fringed with fine hairs on front margin. Trans- 

 verse abdominal bands not extending close to the hind margins of the segments. 



= morsitans, Westw. (p. 276). 



(a) Markedly paler than typical morsitans, but more or less agreeing in 

 its general characters . . . . . . . . morsitans var. pallida, Shircore. 



(b) Resembling morsitans but distinguished by having all the joints of 

 hind tarsi dark as in palpalis group . . morsitans var. paradoxa, Shircore. 



III. GLOSSINA FUSCA group. 



Third joint of antennae fringed with fine hairs on anterior and posterior 

 margins. Fringe on anterior margin conspicuous under a hand lens 

 ( x 15) when fly is examined in profile . . . . . . = 2 



Third joint of antennae with fringe of hairs on anterior margin so short as to 

 be scarcely noticeable under a hand lens, the longest hairs not exceed- 

 ing one-sixth the width of the third j oint. Palpi long and slender = 3 

 f Length of longest hairs on anterior margin of third joint of antennae equal 

 <( to from one-fourth to one-third of the width of joint. Palpi of moderate 



length. Number of hairs on arista 18 to 23 =tabaniformis, Westw. 

 f Pleurae drab-grey or isabella-coloured ; hind coxae buff or greyish-buff 

 { =fusca, Walk. 



^ Pleurae dark grey ; hind coxae mouse-grey . . = fuscipleuris, Austen. 



IV. GLOSSINA BREVIPALPIS group. 



f Dorsum of thorax with four sharply defined, dark brown, more or less oval 

 or elongate spots, arranged in a parallelogram, two in front of and two 

 behind the transverse suture. Proboscis bulb with a sharply defined 

 brown or dark brown tip . . . . =longipennis, Corti (p. 286). 

 Dorsum of thorax without such spots. Proboscis bulb not dark or brown 

 at tip . . .V?- . . . . . . . . . . . . =2 



f Wings with upper, thickened portion of anterior transverse vein much 

 darker in colour than adjacent veins and thus standing out conspicu- 

 ously against the rest of the wing =brevipalpis, Newstead (p. 288). 



| Wings with the part in question not darker than the adjacent veins, the 

 wings being practically unicolourous .. =medicorum, Austen. 



