the Asilldtv of Australasia. 479 



15. Face fairly broati, with tubercle nearly 

 reachiug- the anteniue. Fourth posterior 

 cell closed, in a parallel line or nearly so 

 with the vein closing discal cell Bathypogon, Loew. 



Face very narrow, and narrower at au- 

 tennse, with a \eel-shaped tubercle 

 reaching nearly to the antennse. Fourth 

 posterior cell closed or narrow, not 

 parallel with discal cell Sterwpogon, Loew. 



16. Blue-black shining species. Fore and 



middle tibiae fringed with hairs Psilozona, g. n. 



Cabasa, Walk. 



Dipt. Saund. i. p. 100 (1851) ; id., List Dipt. pt. vi. Suppl. 2, p. 499 

 (1854) ; Schiner, Verb, zool.-bot. Ges. VVien, xvi. pp. t)o2, 653, 703 

 (1866). 



This genus was formed by Walker for one species from 

 Tasmania, Cabasa rufithorax, which he later stated was a 

 variety of Dasypogon pulchellus, Macq. ; the second species 

 1 rom the same locality, which he named Dasypogon venno, 

 had likewise been described previously by Macquart under 

 Oasypogon. 



Tlie genus is allied to Brachyrrhopola, but easily distin- 

 guished by the humpbacked thorax. Schiner did not include 

 it in his table. Walker omitted any mention of the presence 

 of the curved spine on fore tibiae, which is very distinct in 

 the known species, which are small, the thorax bright- 

 coloured, the abdomen blackish, the wings brownish. The 

 antenuae long, the third joint nearly twice as long as the 

 tirst two together. 



The species as yet recorded in the genus are four, only 

 the first two being from Tasmania, the others from Batchian 

 and Aru Island. 



jL'abasa pulchella, Macq., Dipt. Exot. Suppl. i. p. 190, pi. vii. fig. 9 [Z)«>7/- 



eu I ■po(jon\ (1844). Cabasa rufithorax, Walker, Dipt. Saund. i. p. 100 



S (1851). 



/Cabasa rubrithorax, Macq., Dipt. Exot. Suppl. 4, p. 370 [^Dasypoguii] 



j^^S^^J?) (1849). Dasypogon venno, Wallcer, List Dipt. ii. p. 359 (1849'), et 



,, ,, '.--^ vi. Suppl. 2, p. 500 (1854). 



Cabasa honesta, Walker, Proc. Linn. Soc. London, iii. p. 83 [Dam/pogunl 



(1859), et v. p. 277 [Z)«sy/3o</o?2] (1861). 

 (Jabasa glabrata, Walker, Proc. Linn. Soc. London, v. p. 277 [Uam/pogo/i] 

 (1861). 



Cabasa jmlchella, Macq. 

 Cabasa rufithorax, Walker. 



Macquart^s type is in the Paris Museum, seen by me, 

 12. 4. 11, apparently a female. 



Walker's type is identical, a female from Tasmania ; 

 others in Brit. Mus. Coll. from Hobart {J. J. PValker), a 



