422 Mr. E. E. Austen on new 



annuli taken together. Thorax : on dorsum, in addition to 

 grey stripes, humeral calli, an area behind them, and poste- 

 rior border of transverse suture on each side are also grey ; 

 pleurse and pectus mouse-grey ; dorsum sparsely clothed with 

 minute yellowish hairs ; posterior border (sometimes distal 

 half) of scutellum smoke-grey. Abdomen : dorsum clothed 

 with minute yellowish hairs, extreme hind margins of seg- 

 ment except first usually smoke-grey, second, third, fourth, 

 and fifth segments sometimes with a pair of large, admedian, 

 basal, smoke-grey spots, and also with a median, basal, 

 smoke-grey spot, sometimes more or less triangular, and, 

 like the admedian spots, not extending to hind margin ; 

 venter dark brown, extreme hind margins of segments smoke- 

 grey. Wings : second submarginal cell usually with four 

 transverse light marks, apical mark, which is close to tip of 

 wing, sometimes large and conspicuous, sometimes indistinct 

 or obsolete; stigma dark brown, well defined, no conspicuous 

 light mark before it, light mark beyond it a thin semicircular 

 or oval curve ; a second light mark often present in marginal 

 cell in shape of a small fleck immediately above second 

 longitudinal vein, close to distal extremity of cell ; discal cell 

 usually with two transverse light marks (one or both some- 

 times broken up into two spots), and a curved mark close to 

 distal extremity of cell, but not in contact with veins forming 

 its distal boundary ; oblique marks across posterior cells 

 often more or less broken up into spots : markings in basal, 

 anal, and axillary cells of normal type, light mark in upper 

 proximal angle of axillary cell very distinct, sometimes a 

 complete circle. Halteres seal-brown, stalk ochraceous buff. 

 Legs : first joint of middle and hind tarsi (sometimes also 

 second and third joints) ochraceous buff at base (in some 

 cases ochraceous buff except distal extremity) ; front tibiae 

 incrassate. 



Northern Nigeria : type from Kefii, Nassarawa Province, 

 4. ix. 1907, "on horse ■'^ (Dr. R. F. Williams) ; other speci- 

 mens fromZungeru, Zaria Province, 12. vii. 1905 (Dr.Dalziel), 

 Zaria, Zaria Province, 15. vii. 1907 (/. Brand), Allowa, 

 Zaria Province, 19. vii. 1907 (/. Brand), and Kontagora, 

 Kontagora Province, 2. ix. 1903 {Dr. J. J. A. Raye, per 

 Sir Patrick Manson, K.C.M.G., F.R.S.). 



This species, which is said by Dr. Raye to swarm at Konta- 

 gora, would appear to be particularly bloodthirsty. Dr. R. F. 

 Williams writes that it is " a very aggressive biter both of 

 horse and man,^^ and the specimen from Kontagora bit 

 Dr. Raye and sucked his blood inside a mosquito-net. 



Hcematopota lacessens is not closely allied to any of the 



