Diptera from Port Dartot'n, Australia. 227 



Scutum nnd seutellum black dusted with grey, with curved 

 golden hairs. 



Legs reddish browti, tarsi dark brown. Spines on the 

 hind tibioe small but conspicuous in a specimen cleared and 

 mounted in Canada balsam. Spurs on the middle tibiaj long 

 and stout. 



Wings hyaline, with a long pale yellow spot at the distal 

 end of the first longitudinal vein, subcostal vein very pale 

 yellow ; other veins dark brown. Ilalteres reddish brown. 



Abdomen reddish brown, with black and golden hairs ; the 

 last two or three segments dark brown or black. 



I have much pleasure in naming this species after 

 Sir Patrick Manson, G.C.M.G., F.R.S., &c. 



Silvius alcocki, sp. n. 



Small species, length 9 mm. 



Two females. 



^ace grey, with long grey hairs ; palps \ig\it brown, slender, 

 about two-thirds the length of the proboscis, which is black, 

 long, and slender. 



Antennce black ; third segment with a distinct Tabanus- 

 like basal angle. 



Front uniformly wide, about one-sixth the breadth of the 

 head, grey. Frontal callus a rather narrow stripe, neither 

 prominent nor shiny, squarely dilated above the root of the 

 antennse and somewhat triangularly dilated higher up. 

 Ocelli distinct but not prominent. Ei/es quite bare. 



Scutum (denuded) with three dark brown stripes, of which 

 the median one is the broadest ; seutellum black. 



Legs black, the tibiae and tarsi of the second pair perhaps 

 not quite so dark as other parts ; spurs on the hind tibitB 

 strong and conspicuous, reddish brown. 



Wings hyaline, with a very dark brown, almost black, 

 spot at the distal end of the first longitudinal vein. Halteres 

 very dark brown. 



Abdomen reddish brown to warm sepia, the anterior 

 segments lighter than the others. The extreme hind margin 

 of every segment is lighter and is clad with whitish hairs, so 

 that the whole abdomen appears narrowly cross-banded. 



Silvius strangmani, sp. n. 



Small species, length 9 mm. 



Two females. 



Face dark grey, with dark grey hairs. Palps very slender, 

 about two-thirds the length of the proboscis, truncate tips, 

 reddish brown. Proboscis black, long and slender. 



