XVI] VARIETIES 277 



Glossina morsitans Westw., var. pallida Shircore. 



" Thorax slate-grey, pattern indistinguishable ; scutellum with two dark tri- 

 angular areas which are contiguous at their upper inner angles. A bdomen with 

 the darker blotches on each side of the second segment very faint : on the other 

 segments the banding is not a prominent feature, as it is in the typical form ; 

 the bands olive-grey, their margins being distinct and denned from the ground- 

 colour, which is a few shades lighter. In the middle line the banding is cut 

 off square, leaving a very narrow straight line down the centre of the segments ; 

 the outer margins of the bands sloping away from below upwards and leaving 

 light areas on each side. Legs with all the joints of the front and middle tarsi 

 pale, except the distal end of the latter which has a faint darkish ring ; the 

 last two joints of the hind tarsi faintly dark, but nothing like so dark as in 

 G. morsitans. Wings tinged with light yellowish-brown. 



NYASAI.AND : i -f , Dowa district, 6. v. 1912. 



Type in the British Museum. 



This fly was picked out at a glance from more than a hundred G. morsitans, 

 and is distinctly and remarkably paler throughout." (Shircore.) 



Glossina morsitans Westw., var. paradoxa Shircore. 



" Superficially resembles G. morsitans in appearance and size, but the hind 

 tarsi are entirely dark, as in the palpalis group. The superior claspers of the 

 male genitalia resemble those of G. submorsitans, as figured by Prof. Newstead, 

 but are more deeply pigmented throughout, and especially along the lateral 

 and posterior borders. 



NYASALAND : i <? , Nyamsato, near Chunzi, Dowa district, 4. vi. 12. 



Type in the British Museum. 



If casually observed, this tsetse would probably be taken for an ordinary 

 G. morsitans ; but if the abdomen had become discoloured it might well be 

 mistaken for G. palpalis. The superior claspers have only been looked at with 

 a hand-lens ( x 12) ; they were prized open and examined in situ." (Shircore.) 



Distribution. G. morsitans is by far the most widely 

 distributed of all the tsetse-flies, occurring from Abyssinia and 

 Senegambia in the north to Zululand in the south. In all 

 cases the fly is restricted to very definite regions known as 

 " fly-belts " or " fly-areas," and does not occur spread over 

 large tracts of country. It is therefore difficult to give an 

 accurate idea of its distribution without going into great detail, 

 but the fly has been recorded from the following countries : 



Southern Abyssinia, Anglo-Egyptian Sudan, Bahr el Ghazal, 

 Uganda, British, German, and Portuguese East Africa, Zulu- 

 land, the North Eastern Transvaal, Bechuanaland, S., N. E. 

 and N. W. Rhodesia, Nyasaland, the Congo Free State, Upper 



