Ferguson — List of TABANinAE 369 



SILVIUS MARGINATUS? Walk. X.T,, Danvin. I am indebted hir the 

 two ahdve prnx'isional identifications to Mr. G. F. Hill, of the 

 Australian Institute of Tropical Medicine, Townsville. 



SILVIUS IMITATOR sp. nov. 



A small black species resenililing; T. ncocirms and others of the hairy-eyed 

 group of Tabanus. 



9 Black. Face yellowish, grey above ; densely clothed with light .grey 

 tomentinn and with scanty creamv pubescence ; beard creamy ; palpi brown- 

 ish, second joint nearly as long as proboscis, strongly curved at base, rather 

 thick throughout, ending in a blunt pnuit, shallowly grooved on outer surface, 

 densely clothed with grev tonientniu ; antennae black, the two basal joints 

 with some black hairs, the third joint strongly dilatate. upper border strongly 

 convex but hardly angulate. annuli rather shorter, together about equal to 

 basal portion; subcallus clutlieil with grev trimentimi, not markedly tumid nor 

 shining. Forehead very broad, slightly though distinctly narrowed to vertex, 

 hardly twice as long as broad anteriorly : clothed with grey tomentum, with 

 scanty black pubescence; callus nitid. reddish brown, black in places, irregu- 

 larly shaped, occu]i}-ing the \\dio1e of breadth anteriorly and reaching nearly 

 to middle with an o1)Scure extension to near ocelli; ocelli distinct; eyes with 

 rather sparse long wdiite pubescence. Thorax black, reddish brown at sides, 

 with a sub-median .grev stri]ie on each side of median area, most distinct 

 anteriorly, clothed with erect black hairs ("partly abraded): shoulders with 

 dark brown hairs ; sides with long grey puliescent tufts ; scutellum similar to 

 dorsum, posterior border with fringe of scanty grey hairs, .\bdomen black, 

 segmentations narrowly greyish, somewhat wider near lateral margins, with 

 a median row of triangular spots, clothing abraded, but traces of gre\ 

 ]")ubescence jjresent on lateral borders and on median spots ; venter brown with 

 grey segmentations, clothed with erect brownish hairs and decumbent creamv 

 pubescence most marked on segmentations. Legs with femora black, tibiae 

 reddish l)rown : aj^iex of anterior pair darker, tarsi dusky, pubescence grev on 

 femora, black elsewhere ; posterior tibiae distinctly spurred. Wings hyaline, 

 the Ixasal portions of the longitudinal veins and the cross veins narrowlv 

 shaded light brown ; costal cell and extreme base light I^rown ; stigma brown, 

 consj)icuous ; no appendix present. Long; 10 mm. 



Hah. W.A., Bunbury (\Y. R. Mack, Jan., 1S98). Type in South Australian 

 Museum. 



Described froni a single female, not in very good condition, but so distinct 



