Asilida3 of Australia. 63 



white. Antenna blackish, the first two joints with black 

 hairs. Forehead with black hairs. Thorax brownish, with 

 grey tomentum and with black stripes, the median one broad, 

 the side ones shorter; dorsum covered with short black hairs 

 and long black bristles posteriorly, one or two are white. 

 Scutellum with two white bristles on its outer border. Abdo- 

 men black, with erey segmentations, those on the second and 



7 O J O ' . 1111" 



third segments broadest; pubescence on dorsum black, hairs 

 at sides white and black with white and black bristles; geni- 

 talia black, with black hairs and long black bristles. Legs 

 black, the fore femora with long white pubescence and bristly 

 white hairs, the middle and hind pair with shorter white 

 pubescence and bristles ; fore tibiae with two long black bristles 

 on outer side and other black and white shorter bristles; 

 pubescence white, rufous on the inside, middle and hind pair 

 with white and black bristles; tarsi with black bristles only. 

 Wings clear, small vein beyond the middle of discal cell. 



Female is identical, but the fore and middle tibiae are 

 obscurely reddish, and the white bristles of the moustache are 

 rather more numerous ; ovipositor nearly as long as the last 

 two segments together. 



Cerdistus sydneyensis, Schiner, ' Novara ' Reise, Dipt. p. 187 

 (1868). 



One male and one female from Sydney, in Mr. Gibbons/s 

 Coll. 



One male from Hornsby, in Mr. Gibbons's Coll. 



This is a small species distinguished by the reddish-yellow 

 bases of tibire and femora ; the bristles on the legs are largely 

 white, most numerous on the underside of the hind femora ; 

 the two bristles on margin of scutellum are black, the bristles 

 on sides of abdomen black. 



The type was described as from Sydney. 



Cerdistus maricus, Walker, Insecta Saunders, Dipt. i. p. Ill 

 (1851) ; id. List Dipt. Brit. Mus. vii., Suppl. 3, p. 735 

 (1855); Ricardo, Ann. & Mag. Nat. Hist. (8) xi. p. 136 

 (1913). 



In my description of the above the two weak yellow long 

 bristles on scutellum are, present on the specimen from 

 Queensland (a female) ; in the type (a male) they arc black. 

 Another female in Mr. Gibbons's Coll. from Sydney has them 

 yellow. 



