XVl] CLASSIFICATION 249 



II. Glossina morsitans group. 



1. 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 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. 2 ji). 



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. 



(h) 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. 



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

 I margins. Fringe on anterior margin conspicuous under a hand lens 



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



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

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



l ing one-sixth the width of the third joint. 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 



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



C Pleurae drab-grey or Isabella-coloured ; hind coxae buff or greyish-bufif 



■{ =fusca, Walk. 



L Pleurae dark grey ; hind coxae mouse-grey . . =fnscipleuris, Austen. 



IV. Glossina brevipalpis group. 



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

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



J behind the transverse suture. Proboscis bulb with a sharply defined 



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



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

 L at tip . . . . . . . . . . . . . . . . —2 



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

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



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



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

 L wings being practically unicolourous .. =medicorum, Austen, 



