2 J. W. SCOTT MACFIE — THE DISTRIBUTION OF GLOSSINA 



eastern or Patigi, and the southern or Offa divisions. These are known respectively 

 as divisions 1, 2 and 3, and each in its turn is sub-divided into a number of 

 districts. 



Dr. J. D. Falconer in his " Geology and Geography of Northern Nigeria" thus 

 describes the orographical features of the province : — " The primary watershed 

 of the Niger basin which runs from Kabba to Aiedi and thence westward a few 

 miles south of the Ilorin frontier, is not defined by any range of hills or mountains, 

 but by the crest line of a lofty plain which, like a low, extended arch, slopes 

 gently northwards towards the Niger."" Across this plain six rivers — the Weru, 

 Anwa, Oshin, Oyi, Oro and Kampe — run in an approximately parallel direction 

 northward to flow into the Niger. The ultimate courses of the first two are 

 doubtful and it is probable that before reaching the Niger they join in the manner 

 indicated on the map. 



" To the west, Ogga [in Kabba] and Eri are set within a cluster of rocky hills, 

 while to the north there is a comparatively rapid fall to the plains of the Kampi. 

 Between the Kampi and the Niger a steep-sided range of sandstone hills, capped 

 by the pinnacle peaks of Egbom, runs out westward in a succession of rounded 

 ridges two hundred feet above the level of the river, and not until near Share is 

 the river belt of sandstones again bounded by a low escarpment. The Shappa 

 and Orissa Hills form the only prominent range in central Ilorin. The Shappa 

 Hills are of granite, and many of the peaks are gracefully rounded and most 

 picturesque, while the quartzites and gneisses of the Orissa Hills give more rugged 

 and irregular contours. West of the Orissa Hills lies the great plain of Ilorin, 

 thickly populated and well cultivated, in broad undulations trending generally 

 north and south, with scattered inselberge and many kopjes of granite boulders, 

 but with no conspicuous ranges or groups of hills. The Jebba Hills, which extend 

 southward for some distance towards Ilorin, pass westward into an extensive tract 

 of hilly country, high-lying, little known and largely uninhabited, which forms a 

 natural boundary between Ilorin and Borgu."f 



The types of scenery are fairly represented by the photographs reproduced in 

 this article to illustrate the haunts of various species of tsetse-flies. Dr. Falconer 

 summarises their characteristics as follows : — " In Kabba, Ilorin, and Borgu, 

 where crystalline rocks of a granitic or gneissic character cover by far the larger 

 part of the surface, the prevailing and most characteristic type of scenery is that 

 of rolling sandy plains with isolated hills or groups of hills rising abruptly above 

 the general level. On the other hand, where sedimentary rocks, such as sandstones 

 and ironstones, cover the surface, as in the river belt of sandstones in Kabba and 

 Ilorin, the characteristic type of scenery is that of steep-sided and flat-topped 

 ranges and plateaux, with detached tabular and conical hills rising from the lower 

 plains."^ 



Throughout the greater part of the province the vegetation is open bush, 

 scattered with hardy trees that are able to withstand the annual bush-fires. The 

 country occupying the whole of the central part of Ilorin may be described 

 generally as undulating park-like land, well-farmed and dotted with trees, with 



* Geology and Geography of Northern Nigeria, 1911, p. 1G. 



f J D. Falconer, Geology and Geography of Northern Nigeria, p. 18-19. $ Op. cit. p. 20-21, 



