518 Mr. E. E. Austen on new 



verse band sometimes with lighter areas, e. y. in tliscal cell 

 and at base of fourth and fifth posterior cells ; portion of 

 fifth vein bounding second basal cell below more or less 

 suffused with brown ; no apical blotch. Halteres dark 

 brown. Legs : none of the tibiae incrassated. 



Angola (Ochilonda, Bihe) : three specimens, March 7th- 

 9th, 1905 {Dr. F. Creighton Wellmann). The donor's field- 

 note on this species is as follows : — '' Taken March 7th, 8th, 

 and 9th in the edges of bush bordering on small wet plains. 

 Natives call it the ' antelope fly/ and state that it bites 

 principally the duyker-bok [Cephalophus Grhmnii)." 



The slight resemblance between this species and the fore- 

 going as regards abdominal markings has already been noted ; 

 the wing-markings, however, at once distinguish it, and it 

 cannot possibly be confused with any other African Chrysops 

 as yet described. Since neither of the three specimens 

 available is in faultless condition, no special type has been 

 selected ; but the foregoing description has been drawn up 

 from all three, which are therefore co-types. 



Chrysops nigriflava, sp. n, 



'^ . — Length (3 specimens) 7^ to 8| mm. ; width of head 

 2| to 2j mm. ; width of front at vertex | mm. ; length of 

 wing 8 to 8^ mm. 



Cadmium-yellow , with conspicuous black longitudinal stripes ; 

 dorsum of thorax with three black stripes, middle one extending 

 on to scutellum ; dorsum of abdomen with two very broad 

 black stripes, enclosing a narrower median stripe of ground- 

 colour ; base, costal border, and distal half of wings, from 

 base of third vein, blackish broivn, an ill-defined lighter area 

 along posterior margin, commencing below upper branch of third 

 vein and terminating in fifth j)osterior cell ; anal cell [in all 

 three specimens available) closed before reaching margin of 

 wing ; legs black. 



Head cadmium-yellow pollinose; frontal callus shining 

 black, rather narrow in the antero-posterior direction, and 

 on each side ending on a level with outer margin of base of 

 antenna, upper edge somewhat curved, ends rounded off, 

 lower edge straighter ; vertex marked ivith a dark brown 

 nearly circular spot, which includes the ocelli ; median tumid 

 area of lower part of face with shining dark brown triangle 

 on each side, apices of triangle reaching margin of buccal 

 cavity ; no dark spot on jowls ; sides of face, jowls, and 

 under side of head clothed with cadmium-yellow hair; palpi 

 large, lanceolate in shape when viewed from outer side. 



