62 Miss G. Ricardo on the 



is not so marked ; the end-segment of abdomen being 

 destroyed, it is not possible to determine the sex ; the first 

 posterior cell of: wing is very narrow, but not absolutely 

 closed. 



A SILINM. 



Dysmachis rudis, Walker, "List Dipt, vii., Slippl. 3, p. 737, 

 254 (1855) [Asilus] ; Ricardo, Ann. & Mag. Nat. Hist. 

 (8) xi. p. 422 (1911) ; White, R. S. Tasmania, p. 172 

 (1916). 



This has been placed in a new genus Trichoitamus by the 

 late Mr. A. White, who draws attention to the difference in 

 the ovipositor from Dysmachus, the lamella? being free, not 

 wedged in as in the last-named genus. Owing to the War, 

 Mr. White's paper has not yet been forwarded to this country, 

 but owing to his brother's kindness I have had the MS. to 

 study. 



Mr. Gibbons sent me males and females of this species 

 from Sydney. These differ somewhat from the type in the 

 colour of the legs, which are darker, the tibiae only dull red 

 at the base, not reddish yellow on the basal two-thirds, and 

 the first joint of tarsi is black, not yellow ; the whole insect 

 is darker than Walker's type. The female has a short 

 ovipositor, not including the seventh segment, though it is 

 much compressed laterally. 



In the Brit. Mus. Coil, a female from Mangalore, Tas- 

 mania, presented by A. White, has the legs very similar to 

 those of the type, and the moustache has white hairs below 

 the black ones ; in the specimens from Sydney the moustache 

 is wholly black. 



Cerdistus auslralis, £ ? , sp. n. 



Type (male) and two other males, type (female) ; all from 

 Sydney. In Mr. Gibbons's Coll. 



A small black species distinguished from Cerdistus maricus } 

 Wlk., and Cerdistus sydneyensis, Schiner, by the entirely 

 black legs in the males. Schiner's species has the wings 

 tinged with grey, which does not appear in this species. 



Length 13 mm. 



Male. — Face blackish brown, with a little white tomentum 

 at sides and below. Tubercle small, with moustache com- 

 posed of black bristles and some white ones below. Beard 



