BY ARTHUR WHITE. 8^ 



10. Thorax with long bristles, which extend from 



the anterior to the posterior margin. 



T K I c H o I T A M u s, Geii. nov. 



Thorax with the bristles on the anterior half 

 much shorter thaai those on the posterior half 11 



11. Black or grey species with the ovipositor often 



greatly elongated, femora always entirely 

 black. Neoitamus, Ost-Sack. 



Brownish species, with the ovipositor usually 

 not so elongated, femora never entirely black, 

 and usually striped longitudinally, the 

 upper surface being black, the lower red, yel- 

 low, or light brown. 



R n A B D o T o 1 T A M u s, (Jen . nov. 



O M -M A T I u s, Wied. 



Of this genuM, distinguished by the feathered antennal 

 style, nine Australian sj)ecies have so far been described; 

 one additional species is now added. 



Ommativs oBSCuurs, Sp. nov. 



Face grey ; moustache black above white below ; 

 thorax, abdomen, and legs black, the tibite a little rusty 

 ai the knees; scutcllum with two black marginal bristles; 

 wings almost hyaline, but tinged faintly with brown along 

 the costal margin. 



Len(jth. Male, 8 mm. 



Hdh. Milson Is., N.S.W. 



Male. Face grey ; moustache composed of long black 

 bristles above, and a few white bristles below. Front 

 grey, with ocellar tubercle black. Antenna? black. Thorax 

 black, with a little grey tomentum on shoulders, at sides, 

 and along the posterior margin, the whole bearing short 

 anterior and long posterior bristles; scuteilum black, with 

 two long black marginal bristles. Abdomen black, the 

 hindmargins of segments very narrowly brown, almost 

 bare, but with a little white pubescence at base. Legs 

 black, the tibiae brown at the knees ; femora with white 

 pubescence ; tibife and tarsi with black bristles, the an- 

 terior tarsi bearing also a few white bristles, but the latter 

 character mav not be constant. Wings rilled, but not 

 inflated, almost hyaline, but with the costal margin tinged 

 with brown, especially towards the tips. Halteres dull 

 yellowish-white bordered with brown. 



The only othen small Australian species of Owmntiim 

 with black legs are 0. pilosus, from Tasmania and South 



