96 



Tabanus billingtoni, Newstead. 



Annals of Tropical Medicine and Parasitology, Series T. M., Vol. I., 

 No. I., p. 46, PI. III., fig. 1, and PI. IV., figs. 10-12 (1907). 



PLATE VII., PIG. 53. 



Although almost identical as regards the pattern of the wing- 

 markings, the present species can easily be distinguished from the 

 foregoing by the abdominal characters, including the yellow base, 

 narrow yellow bands, and absence of median dorsal triangles. Des- 

 cribed from specimens collected in the Congo Free State, during the 

 expedition of the Liverpool School of Tropical Medicine to the 

 Congo, 1903-05, the only other country from which Tabanus 

 billingtoni has yet been received is Southern Nigeria. The localities, 

 etc., of the eight females in the National Collection are as follows. 

 Congo Free State : Bolengi, Upper Congo, July, 1903 (Dr. E. A. 

 Laytori) ; Baptist Missionary Station, Tshumbiri, near Leopold- 

 ville, 1904 (Rev. and Mrs. Billingtori) ; Lopori River, Upper Congo, 

 October, 1907 (Rev. W. D. Armstrong}. Southern Nigeria : Ologbo, 

 May, 1906 (G. C. Dudgeon}. 



Tabanus secedens, Walker. 



List of the Specimens of Dipterous Insects in the Collection of the 

 British Museum, Part V., Supplement I., p. 224 (1854), for 

 Tabanus tibialis, Walker (nee Macquart), op. cit., Part I., p. 162 

 (1848) (nomen bis lectum}. 



PLATE VII., FIG. 54. 



This species, of which Tabanus gabonensis (garonensis}, Macq., 

 is a synonym,* is somewhat variable in appearance according as 



* 7'abanus blanchardi, Surcouf (Archives de Parasitologie, T. XI., p. 473, PL IX., 

 figs. 3, 4 (1907), and T. brunnescens, Ricardo (Annals and Magazine of Natural 

 History, Ser. 8, Vol. I., p. 322 (1908) ), are also synonyms of T. secedens, Walker. 



