Ill 



(Dr. E. A. Layton} ; Bonginda, Lulanga River, Upper Congo, 

 November 5th, 1907 (Rev. W. D. Armstrong}. Portuguese Congo : 

 San Salvador, 1909 (Dr. M. Gamble}. 



Dr. J. L. Todd, writing of Tdbanus canus as met with in the Congo 

 Free State during the Expedition of the Liverpool School of Tropical 

 Medicine to the Congo, 1903-05, remarks : " This fly was only 

 taken by persons travelling in canoes. It is reported to fly very 

 rapidly, and its bite is said to be very severe." * According to the 

 Rev. W. D. Armstrong, in the Congo Free State the species is " never 

 found inland, is not very numerous, and only comes out in the 

 twilight." The latter statement is supported by the mention by 

 Surcouf and Roubaud of three specimens of T. canus as having been 

 taken at 6.0 p.m. on the Lower Alima, in French Congo, where it is 

 stated to attack human beings. f 



Tabanus quadrisignatus, Ricardo. 

 Annals and Magazine of Natural History, Ser. 8, Vol. I., p. 320 (1908). 



PLATE IX., FIG. 69. 



Three females, from Ruwe, Lualaba River, and the valley of the 

 Lualaba, Katanga District, Congo Free State (between 9 and 11 

 S., and about 26 E.), February, 1906 (Dr. A. Yale Massey}, are the 

 present representatives of this species in the National Collection. 

 Tabanus distinctus, Ricardo, which occurs in North-Eastern 

 Rhodesia and Benguella, Angola, may be distinguished from T. 

 quadrisignatus, which it closely resembles as regards the abdominal 

 markings, by the presence of a narrow median light stripe on the 

 front portion of the thorax. 



* Annals of Tropical Medicine and Parasitology, Series T.M.. Vol. L, No I p 44 

 (February 1, 1907). 



t Gf. Surcouf and Roubaud, Bulletin du Museum National d'Histoire Naturelle, 

 Annee 1908, No. 5 (Paris, 1908). 



