SOME BLOOD-SUCKING AND OTHER DIPTERA FROM THE ANGLO-EGYPTIAN SUDAN 63 



of discal cell, and dying away on fore border of fifth posterior cell, before reaching hind 

 margin ; discal cell with a more or less conspicuous longitudinal pale streak ; alula and 

 squamiB dusky, margin of latter sometimes green. 



Hfdteres : knob pale green, stalk yellow. 



Described from a specimen from the Anglo-Egyptian Sudan, 1905 (received from 

 Dr. Andrew Balfour). Type of subspecies in British Museum (Natural History). 



Ta/ianiis fasciatus }iiloticu.'< seems to be common on parts of the White Nile and of the 

 Bahr-El-Jebel. It was taken at Kodok in December 1900, by the late Captain H. E. 

 Haymes, R.A.M.C., and, in the early part of the same year, also by Major R. H. Penton, 

 D.S.O., RA.M.C. Colonel G. D. Hunter, D.S.O., met with it on a boat at Abu Chok (between 

 Gondokoro and Tautikia), on May 29, 1905, and Major Penton also took it in numbers in 

 the Bahr-El-Ghazal in February of last year. Owing to its characteristic colouration and 

 wing-marking it is easily recognised, and cannot be mistaken for any other species. 



The new subspecies differs from the typical form of Tahanus fasclatnx, Fabr., Systema 

 Entomologite, p. 788 (1775), a common West African species found from Sierra Leone to 

 the Congo Free State, in the colouration and hairy covering of the front tibiae (which in the 

 typical form are entirely black and clothed exclusively with black hair), in the colouration of 

 the middle and hind tibiae (yellow or greenish-yellow instead of black or dark brown), and in 

 the hind tibiae on the outside having a golden instead of a black fringe. The front tibiae in 

 T. fattciatitu inloticus appear to be slightly more slender than in the typical form, the anterior 

 curve being less abrupt. The wings in the typical form usually show no clear space in the 

 discal cell. 



The range of T. fascia fit -t nilofirK.'i extends at least as far south as Uganda, whence the 

 Museum possesses a series of specimens from the Botanic Gardens, Entebbe, September 18, 1904 

 [Captaiit E. D. W. Grng, /.jI/'.«S'.), Bugaya Island, Lake Victoria, and Ankole, August, 1903 

 (Colonel D. Bruce, C.B., R.A.M.C). A specimen from Ankole, May 16, 1903, belongs to a 

 form intermediate between the subspecies niloticns and the typical T. fa.iciafiiti, Fabr., since 

 although the front tibiae are pale at the base, the fringes on the hind tibise are on the distal 

 half mainly composed of black hairs. A transitional form (as well as the typical one) is 

 also found in the Congo Free State, where specimens are met with showing no golden hairs 

 on the basal half of the front tibiae, but with golden hairs, interspersed with the black or 

 more or less predominant, in the fringe on the inner and outer side of the basal half of the 

 hind tibiae. A specimen of this form was also taken at Fajao, Uganda, in November, 1904, 

 by Captain E. D. W. Greig. 



Tahanus africanus, G. .R. Gray 

 ■ (Fig. 28) 



Tahanus africauus, G. R. Gray, Griffith's "Animal Kingdom" (Cuvier), Vol. 15, p. 794, 1^^^^^^^ 

 Plate 114, Fig. 5 (1832). 



Tahanus latipes, Loew {nee Macq.), Die Dipteren-Fauna Siidafrika's, p. [108] 36 (1860). 



The identification of this species rests upon Gray's coloured figure, which is 

 fortunately recognisable, for the original description consists of the single word '' Fulvous." 

 It therefore seems advisable to re-describe the species, more especially since the careful 

 description of the $ by Loew (loc. cit.), besides being in German and published by its 

 author under the name of the closely allied Tabanus latipes, Macq., can scarcely be 

 accessible to the majority of those interested in the Blood-Sucking Flies of the Sudan. 



