BY ARTHUR WHITE. 57 



• differs so much in appearance from the male that it might 

 be easily mistaken for a distinct species. One of these 

 bands crosses the three basal cells, the other crosses the 

 -outer parts of the discal and fourth posterior cells ; the 

 wing-tips are also clouded with black. The colouring of 

 the body and legs resembles that of the male, but the 

 eyes are widely separated, the front broad, black, and 

 shining, and the two basal segments of the abdomen are 

 often brown ; on the under surface of the abdomen the 

 first segment is transparent yellow, the second amber, and 

 remaining segments black. 



This species may be easily distinguished from P. elegans 

 by the smaller antenna?, the black instead of pale orange 

 femora, and, in the female, by the wings being crossed 

 by two black bands, instead of being altogether hyaline. 

 In a nearly allied, undescribed, Victorian species the wings 

 of the female are crossed by three black bands. 



P. bifasciata occurs both settled on the ground, and 

 amongst long grass. My dates range from October 1 to 

 January 12. 



Doubtful Species. 



The following five species have also been described from 

 Tasmania: — Thereva hebes, Walk., T. hyalipennis, Macq., 

 T. quinquevittata, Macq., T. varians, Walk., and T. varices, 

 Macq. Thereva is a genus that does not occur in the 

 Australasian Region, and the species are probably unrec- 

 ognizable. 



