BY ARTHUR WHITE. 155 



4. Fourth posterior cell closed at some distance above 

 the wing margin; wings very short. 



Bathypogox, Loew. 

 Fouilh posterior cell open ; wings long. 



S T E N o p o G o N, Loew. 



28. Cab AS A, Walk. 



Small, humpbacked species, with red thorax, and wingg 

 partly or altogether black. 



Antennse a little longer than the head, the first joint 

 rather longer than the second, the third strap-shaped, 

 about twice the length of the first two joints together, and 

 terminating bluntly without any style or arista. Thorax 

 extremely gibbous. Abdomen a little constricted at the 

 base. Legs rather slender, with a few thin bristles. Wings 

 large, the four posterior cells all wide open. 



Tab/e of the Tasinaniaii Species of Caha-sa. 



1. Thorax red; abdomen violet-black or greenish- 



black. 2 



2. Wings entirely black. Pulchella, Macq. 

 Wings with basal half black, apical half hyaline. 



RUBRITHORAX, Macq. 



Cabasa pulchella, Macq. 

 Syn. Cabasa rufithorax, Walk. 



Thorax red: abdomen violet-black or greenish-black; 

 wings eniirely brownish-black. 



Length. Male and female, 6-9 mm. 



Hab. Generally distributed. (Also in Victoria and 

 Queensland.) 



Male and Female. Face black, with white tomentum at 

 sides. Moustache, antennae and front black. Thorax red, 

 with a black anterior dorsal stripe, and small black spots 

 on shoulders and at base of wings; scutellum black. 

 Abdomen violet-black or greenish-black, with segmentations 

 marked at the sides with white. Legs black. Wings en- 

 tirely brov/nish-black. 



This species may be easily recognised by its hump- 

 backed shape, red thorax, and wholly black wings. It 

 is not common, but seems to b3 widely distributed in the 

 Tasmanian bush. My dates range from January 11 to 

 February 15. 



Cabasa rubrithorax, Macq. 

 Syn. Dasyidogon venno, Walk. 



Thorax red ; abdomen violet-black or greenish-black ; 

 wings with basal half black, ap;"cal half hyaline. 



Length. Male, 6 mm. 



Hab. Bagdad. 



