350 JAS. J. SIMPSON— ENTOMOLOGICAL 



(e) G.fusca is also a Southern Nigerian species, and so far has beeu seen only 

 in the Kabba Province. 



(/) In the various species of Glossina, as also in nearly all other species of 

 insects, there is a gradual diminution in size and a gradual tendency to become 

 paler in the northern parts of the Protectorate, where the country is more open, 

 the dry season is of greater duration, and the influence of the dry hot harmattan 

 is more intensive. 



I hope to deal at greater length with the question of the distribution of the 

 various species of Glossina as shown in this Protectorate, after my report on 

 Southern Nigeria, when both Colonies may be regarded as one geographical 

 unit. The same applies to the bionomics of tsetse and the other blood-sucking 

 flies mentioned in this report. 



I have added the following extracts from reports by medical officers in the 

 Protectorate as these extend our knowledge of the distribution of Glossina in 

 regions I was unable to visit. 



Dr. J. M. Dalziel, reporting on a trip made in December, 1910, in the Sokoto 

 Province with a view to " making inquiries in regard to the distribution and 

 prevalence of tsetse in that neighbourhood," draws the following conclusions* : — 



(1) On the main road between Anka and Banaga tsetse-flies are found at the 



following localities : — («) Byassa, 15 miles south of Anka and 2 from 

 Bajega — G. morsitans ; (6) In the three-mile belt of high woods 

 beginning at 6 miles south of Bajega and ending at 3 miles north of 

 Banaga — G. morsitans ; (c) Fassa, a tributary of the Banaga River, 

 'J:h miles north of Banaga — G. morsitans and G. tachinoides ; 

 (d) Matakwri ravine near Daraga — G. morsitans. 



(2) They are found in streams or in the bush away from the main road at : — 



(«) Korammar Beji, near Bajega — G. morsitans and G. tacliinoides ; 



{b) Korammar Karawai, near Bajega — G. morsitans ; (c) west of 



Banaga, from the stream Fulani through the bush to Kainkenni, 



4 miles from the town — G. morsitans, and in places G. tachinoides. 



He adds, "No native admits that tsetse-flies are found north of Anka, 



75 miles by road from Sokoto, and I think they are right " but some of the 



smaller Tabanidae are found as far north as Sokoto. 



Dr. C. W. McLeay, writing to the Principal Medical Officer (18.1.10), says 

 with regard to the Ilorin Province : — 



"(t. tachinoides are plentiful on the Niger between Ogudu and Jebba — at Jebba 

 itself G. morsitans is found. Morsitans occurs also at Ilorin and Pategi and a 

 main belt crosses the Iloriii-Pategi road at Zambagu. At Orimope, Omu, Awtun 

 and Osi G. tachinoides were caught by Asst. Resident Bryant. I think this 

 fly must be very generally distributed over the southern portion of the Province 

 and towards the Kabba country." 



Capt. F. E. Bissell, R.A.M.C, writing from Bauchi on Dec. 7th, 1910, 

 reports that he visited Bebua, altitude 2,200 ft., two days' march from Bauchi, 



* Where possible, these records have bean iu'jluded on the accompanying map. 



