RESEARCH IN BRITISH WEST AFRICA. 349 



Congolese specimens, and the morsitans type only in the East African specimens. 

 It is quite possible that if a larger number be examined intermediate forms 

 may be found, but in default of this, and for the reason given in a previous 

 paper (supra,]). 297), I have decided to regard the ^[gevia,n lovm as submositans, 

 and as such they are recorded in this report and shown on the accompanying map. 

 It may be, and probably is, the case that (i. submorsitayis is the western form 

 of the eastern G. morsitans, just as G. lonc/ipalpis is the western form of the 

 eastern G. palUdipes. 



As already stated, all authentic records, including those in the National 

 Collection, have been incorporated in the accompanying map, but several locali- 

 ties given on the labels attached to some of the specimens are so vague as to 

 defy localisation by means of the published maps, and these are now added in 

 the hope that those better acquainted with the districts mentioned may be able 

 to furnish fuller information with regard to their precise position. 



G. palpalis. — Kabba Province : Gbeliko, Oso, Akumbu, Ipesi, Obuni, 

 Otun, Oshi li , Poinia, Ife, between Isua and Ifcra, between Ibillo and Ate, 

 Ekon, between Opepe and Edoka, between Opepe and Imiakebu ; Bebua, 

 Bade E., Bauchi Province, N. Nigeria 2000 ft. ; Zugabutu, Nassarawa 

 Province ; Epa, Nupe Province ; Glendenne ; Zuguleba, Jega ? District. 



G. tacliinoides. — Adiale, Bassa Province ; Niger River between Yantalah and 

 Borgu ; Bebua, Bade River, Bauchi Province ; Wolu R., near Siram ; Ebuni, 

 Kabba Province ; half-mile S.E. of Alanjo, Hadeija ; in swamp W. of Kugeru ; 

 Marama ; Kabuk ; Kontagora R., between Mudangi and Adala ; Adala, 

 Kontagora R. ; Pakim, Kilenge R. ; Nairanewa, Benue R. ; Sliari R. delta. 

 Lake Chad ; Goalf ei on Shari R. ; Shodu R. ; Sokwa ; Alo R., W. Marghi 

 District, Bornu. 



G. submorsitans. — Gwayo, Ilorin Province ; half-mile S.E. of Alanjo, Haideija ; 

 swamp W. of Kugeru ; Marama ; Kabuk ; Kontagora River, between Mudangi 

 and Adala ; Adala on the Kontagora River ; near Daraja, Kontagora Pro- 

 vince. 



G. hngipalpis. — Dokaro, Kabba Province. 



I do not propose, in the present paper, to discuss the distribution of the various 

 species of Glossina as I have already dealt, in chapiters I and II, with the 

 factors which influence such distribution ; and further, because our knowledge 

 of this subject is not yet complete enough for any generalisations. At the same 

 time, I should like to point out a few of the outstanding deductions to be drawn 

 from the present study. 



(«) G. palpalis is confined to the Niger-Benue River system, and has not 

 yet been found in the region of the Lake Chad system. This species also 

 diminishes in numbers in the drier regions. 



(b) G. tacliinoides is found all over the Protectorate, but is more especially the 

 predominant species in the north. 



(c) G. submorsitans is also scattered all over the Protectorate, but is more 

 intimately associated with G. tacliinoides than with G. palpalis. 



(d) G. hngipalpis is essentially a Southern Nigerian form, and is found only in 

 the provinces bordering that Colony. 



