14 E. W. Ferguson ; 



tufts of long pubescence, mostly creamy, brown in centre ; 

 scutellum reddish brown. 



Abdomen, narrower than in female, dark brown, segmentations 

 lighter, clothing abraded. 



Legs and wings as in female. 



Hab. : — South Australia, Denial Bay, Murray River. 



SlLVIUS SULCIFRONS, 11. Sp. 



A black medium sized species ; forehead with median line de- 

 pressed, sulcif orm ; wings clouded on veins. 



? Long: — 12 mm., width of head 4 mm., wing 11 mm. 



Face and cheeks clothed with grey tomentum and rather 

 sparse black pubescence, a few white hairs in groove between 

 lace and cheeks ; beard white ; palpi dark reddish, clothed with 

 short black pubescence, second joint long, nearly equal to pro- 

 boscis, slightly curved; moderately stout at base, apex truncated; 

 antennae with first joint rather long, black, clothed with grey 

 .tomentum and black pubescence, second joint much shorter, red- 

 dish, with circlets of black hairs, third joint reddish, annuli black, 

 base broad with a very strong tooth projecting forwards; sub- 

 callus not strongly tumid nor shiny, densely clothed with grey 

 tomentum and with short black pubescence. Forehead com- 

 paratively narrow, subparallel, densely clothed with brownish 

 tomentum, with scattered black pubescence; a short linear callus 

 anteriorly followed by a depressed sulciform line extending to 

 ocellary triangle ; ocelli present ; eyes hairy. 



Thorax black, tomentum dusky, with faint traces of a sub- 

 median grey line on each side anteriorly; pubescence black, a few 

 grey hairs posteriorly and at sides; shoulders dark, with reddish 

 tinge, clothed with long black pubescence, sides black with grey 

 tomentum and tufts of long hair mixed with black and hoary 

 grey. Scutellum black with scanty grey hairs along posterior 

 margin. 



Abdomen black, segmentations reddish brown; with decumbent 

 black pubescence and apical triangular white flecks on second, 

 third and fourth segments, first four segments also with posterior 

 margin fringed near sides with white pubescence. 



Legs dark, femora black with yellow knees, tibiae- and tarsi 

 reddish brown ; posterior tibial spurs rather long and distinct. 

 Wings with veins faintly margined with brown ; most distinct 

 .along anterior border and on cross veins. 



Hab.:— West Australia, Perth (G. H. Hardy). 



