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, oehraceous, 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 tibife. 



Chrysops cana, sp. n. (fig. 3). 



(3 • — -Length (2 specimens) 7"5 mm. ; width of head 2'5 ram. ; width of front 

 in centre 0"25 mm. ; length of wing 7'6 mm. 



Small, partli/ grey, partly white species, loith face and body thickly clothed ivith 

 tchite hair, ivith black antennce and leys, and with semi-hyaline loings conspicuously 

 marked with clove-brown, as shown in Jig. 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 antennaj 



Fig. 3. — Chryao^^s cana, Austen 



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* ; imlpi slate-grey, relatively 



* In a note attached to one of the two specimens of this species taken by him, the collector, 

 Mv. S. A. Neave, describes the eyes in the living insect as : — " Deep blue-green, with three sma,ll 

 white spots near the outer margin." 



