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



on tour in their divisions, thus enabling me to obtain insects even from the most 

 remote corners of the province. 



The specimens include representatives from practically every district, excluding 

 only the great uninhabited tracts. Altogether 612 collections were obtained 

 from more than 500 different localities, and so far as is possible these are indicated 

 on the accompanying map by means of the conventional signs suggested by Dr. J. 

 J. Simpson.* As, however, the incompleteness of the geographical survey renders 

 it impossible to mark down all the places accurately, an alphabetical list of them 

 is appended. The list has, of course, a positive value only ; and no doubt in many 

 places the flies were overlooked, either because they were present in small numbers, 

 or because the conditions were unfavourable — the day may have been wet or cloudy, 

 or the locality may have been visited in the early morning before the flies were 

 abroad. My own rule, and the instructions I gave to my collectors, was to stop 

 at every stream or closely wooded spot for half an hour. If in this time no tsetse- 

 flies were seen, it was concluded either that they were not present, or that they 

 were present in such small numbers that, for all practical purposes, they were 

 not a menace to cattle or transport animals. 



The species of Ghssina noted were G. palpalis, G. tachinoides, G. submorsitans, 

 and G. longipalpis. Speaking generally, it may be said that G. palpalis and 

 G. tachinoides occurred in all districts of the province. G. submorsitans, however, 

 was restricted to the eastern division in a somewhat curious manner. f No flies 

 of this species were taken to the west of a line corresponding roughly with the 

 fifth degree of longitude, and none were found further south than Egbe and 

 Ofa Ora. 



The Main Rivers. 



Several collections have been obtained from different parts of each of the six 

 main rivers which traverse the province. The actual courses of these streams 

 are largely conjectural ; but as, in the case of each river, collections are included 

 which were obtained at widely separated points extending from the vicinity of 

 its source to the neighbourhood of its confluence with the Niger, I do not 

 think that it is an unreasonable assumption to suppose that the intermediate 

 reaches are similarly tsetse-haunted. To substantiate this belief, a short stretch 

 of the Oyun River was examined in greater detail, namely, the six or seven 

 miles which run between the point where the river is crossed by the main road 

 from Ilorin to Balogun and the railway bridge close to the confluence of the 

 Oyun River with the Aza (PI. I., fig. 2). The accompanying sketch-map shows 

 the tsetse-flies taken at the fourteen points at which the river was examined. 



On each of the six rivers G. palpalis and G. tachinoides occurred, and, in 

 addition, G. submorsitans was found to frequent the River Kampe, as well as the 

 northern portions of the Oro and the Oyi. 



* Bull. Ent. Research, ii, Jan. 1912, p. 297. 



f In this paper Zumbufu has been included in the eastern division in consideration of its 

 geographical position, although for administrative purposes it is assigned to the western 

 division. 



