166 ERNEST E. AUSTEN—THREE NEW AFRICAN SPECIES 
close agreement with it in the wing-markings, is distinguishable by its larger size, 
by the coloration of the median portion of the dorsum of the thorax being 
mummy-brown instead of greyish-olivaceous or blackish, and by the dark stripes 
on the abdomen being less deep in colour and not extending beyond the middle 
of the third segment. In comparison with C. silacea the distinctive characters 
of the new species are :—the browner coloration of the dorsum of the thorax, 
the incompleteness of the admedian, ochraceous, thoracic stripes, the ground colour 
of the dorsum of the.abdomen, which is much less vivid, the greater breadth and 
faintness of the abdominal markings, the greater breadth and darker hue of the 
oblique transverse mark in the centre of the wing below the stigma, and the 
darker coloration of the legs, especially the hind femora and tibiz. 
Chrysops cana, sp. n. (fig. 3). 
6 .—Length (2 specimens) 7°5 mm. ; width of head 2°5 mm.; width of front 
in centre 0°25 mm. ; length of wing 7°6 mm. 
Small, partly grey, partly white species, with face and body thickly clothed with 
white hair, with black antenne and legs, and with semi-hyaline wings conspicuously 
marked with clove-brown, as shown in fig. 3. 
Head: face and jowls dull white, no shining tubercle or tubercles on former, 
occiput grey, hairy covering of face also extending on to jowls and lower surface ; 
upper two-thirds of front blackish slate-coloured, space between base of antennz 
Fig. 3.—Chrysops cana, Austen. ¢. x 6. 
and eyes pearl-grey ; ocelligerous tubercle occupying vertex clothed with erect 
whitish hair in centre of posterior margin, and with erect blackish hair on 
posterior angles and in front ; eyes noticeably flattened in an antero-posterior 
direction, narrowly separated in centre of front* ; palpi slate-grey, relatively 
* Tn a note attached to one of the two specimens of this species taken by him, the collector, 
Mr. S. A. Neave, describes the eyes in the living insect as :—‘‘ Deep blue-green, with three small 
white spots near the outer margin.” =. 
