Diptei'd from Port Darwin, xiustralia. 227 



Scutum and scuteUum black dusted with grey, with curved 

 golden hairs. 



Legs reddish brown, tarsi dark brown. Spines on the 

 liind tibise small but conspicuous in a specimen cleared and 

 mounted in Canada balsam. Spurs on the middle tibiae long 

 and stout. 



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

 end of the first longitudinal vein, subcostal vein very pale 

 yellow ; other veins dark brown. Halteres 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 alcocJci, sp. n. 



Small species, length 9 mm. 



Two females. 



T'acegrey, with long grey hairs ; palps \ig\it brown, slender, 

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

 long, and slender. 



Ante7ince hhck ; third segment with a distinct Tahaaus~ 

 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 

 antennas and somewhat triangularly dilated higher up. 

 Ocelli distinct but not prominent. Eyes quite bare. 



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

 the median one is the broadest ; scutellum black. 



Legs black, the tibi^ and tarsi of the second pair perhaps 

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

 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, tiie anterioi' 

 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. 



