RESEARCH IN BRITISH WEST AFRICA. 349 
Congolese specimens, and the morsitans type only in the Hast 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, p. 297), I have decided to regard the Nigerian formas submorsitans, 
and as such they are recorded in this report and shown on the accompanying map. 
It may be, and probably is, the case that (G. submorsitans is the western form 
of the eastern G. morsitans, just as G. longipalpis is the western form of the 
eastern G. pallidipes. 
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: Gbheliko, Oso, Akumbu, Ipesi, Obuni, 
Otun, Oshi R, Poinia, Ife, between Isua and Ifera, between Ibillo and Ate, 
Kkon, between Opepe and Edoka,’ between Opepe and Imiakebu; Bebua, 
Bade R., Bauchi Province, N. Nigeria 2000 ft.; Zugabutu, Nassarawa 
Province ; Epa, Nupe Province; Glendenne ; Zuguleba, Jega ? District. 
G. tachinoides.—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.; Shari R. delta, 
Lake Chad; Goulfei on Shari R.; Shodu R.; Sokwa; Alo R., W. Marghi 
District, Bornu. 
G. submorsitans.—Gwayo, Lorin Province ; half-mile §8.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. longipalpis.—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 chapters 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. 
(a) 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. tachinoides 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. tachinoides than with G. palpalis. 
(d) G. longipatpis is essentially a Southern Nigerian form, and is found only in 
the provinces bordering that Colony. 
