AUSTRALIAN BLOOD SUCKING FLIES. 237 



specimens. S. clelandi and S. longicornis differ from the 

 other species in always having the third veinlet present, 

 extending nearly or quite half way to the wing margin; the 

 angulation below is also variable in these species. 



In S. tabaniformis, White figures the anal cell as closed 

 in the wing margin; in all the species before me, the anal 

 cell is closed just before the margin to which it is united 

 by a short stem. 



In one particular all the new species differ from White's 

 description of the genus. The tibiae are described as not 

 having distinct spurs, although in White's description of 

 the family Lepticlse the posterior 1 tibiae are stated to be 

 spurred. In all the species herein described the middle 

 tibiae possess two distinct spurs, one of them slightly larger 

 than the other. 



The following table should enable the known species to 

 be readily differentiated. 



Table of Species. 



a. Legs yellow, venter yellowish. 

 b. Wings hyaline. 



c. Large species (5 mm,) = S. tabaniformis White. 

 cc. Small species (3 mm.) = S. vexans, n.sp. 

 bb. Wings with anterior margin infuscate in outer half 



= S. marginipennis, n.sp. 

 aa. Legs bicolorus; venter dark grey. 



d. Size medium (4 mm.), arista of moderate length (4 mm.) 



= S. clelandi, n.sp. 

 dd Size large (5*5 mm.), arista long (-8 mm.) 



= S. longicornis n.sp. 



The types of the new species are in the collection of the 

 Microbiological Laboratory, Department of Public Health. 



1 It is possible that "posterior" is here a misprint for "middle," as 

 WilHston places spurred middle tibiae among the characters of the family. 



