164 



EENEST E. AUSTEN— THREE NEW AFRICAN SPECIEo 



Chrysops centurionis, sp. n. (fig. 2). 



Q. — Length (2 specimens) 9-5 to 10'6 mm.; width of head 3 to 3*25 mm.; 

 width of front at vertex 1-2 mm. ; length of wing 9"75 to 10-25 mm. 



Large-sized, long-winged species : dorsum of thorax and distal extremity oj 

 ahdomen mummy-hrown, proximal portion of abdomen raiv-sienna-coloured, with a 

 pair of broad but semi-indistinct, blackish, longitudinal stripes; antenncB dark brown 

 (second joint clove-broiim), Jirst joint, except distal extremity, russet-broion or 

 cinnamon • wings marked as shoion in fig. 2, without a broad and conspicuous 

 blackish or dark brown transverse band across centre ; legs burnt-umber or rato- 

 umber-cohured, front and hind tibia and first joint of front tarsi broion, last four 

 joints of front tarsi and distal extremities of middle and hind tarsi dark brown. 



Fig. 2. — Chryso2}s centurionis, Austen. $. x 5. 



Head ochre-yellow polliuose, a transverse band on vertex, including ocelli and 

 extending from eye to eye, dark sepia-coloured ; frontal callus raw-umber- 

 coloured, dark brown on sides and upper margin, wider than deep, upper margin 

 curved and produced in centre into a small upwardly directed angle, lower 

 margin straight ; face with a single, median, shining mummy-brown, elongate 

 cordate _/«£■!«/ tubercle; jowls with a small, shining, clove-brown transverse mark, 

 somewhat triangular in outline, below each eye ; front, above frontal callus, 

 clothed with short dark brown hair, under surface of head and sides of lower part 

 of face clothed with chrome-yellow hair ; jxdpi tawny-ochraceous, terminal joint 

 lanceolate, narrower than in foregoing species ; first joint of antennae not at all 

 swollen, clothed like second joint with short black hair, third joint at end of 

 proximal third with a burnt-umber-coloured band. Thorax : dorsum with a 

 narrow, dark brown, longitudinal median stripe, and also with a pair of more 

 or less faint and indistinct chrome-yellow or buff-yellow, admedian pollinose 



