Mr. Tl. E. Turner on Fossorial Hymenoptera. 445 

 Other closely allied species in this group are : — 



Bembex lit (oralis, Turn. 

 Bembex liftoralis, Turn, Proc. Zool. Soc. London, p. 502 (1908). S ■ 



Hab. Port Darwin, N.T. 



This species has the tubercle of the second ventral segment 

 curved and acute as in B. musca. A form from Perth, 

 apparently a variety, has the markings strongly developed 

 and the clypeus yellow. 



Bembex mackayensis, Turn. 

 Bembex mackayensis, Turn. Proc. Zool. Soc. Loudon, p. 351 (1910). 



Hab. Mackay and Cairns^ Q. {Turner). 



Bembex tuberculiventris, Turn. 



Bembex tubereulkentris, Turn. Proc. Zool. Soc. London, p. 503 (1908). 



6. 



Hab. Cooktown, Q. 



The two last species have the tubercle on the second 

 ventral segment truncate at the apex, not acute as in musca ; 

 tubercuUventris also has eight spines on the basal joint of the 

 anterior tarsi, not six as in the. other species of the group. 

 The ventral abdominal segments are nearly entirely yellow 

 in tubercuUventris, black in mackayensis. In the shape of the 

 tubercle these two species somewhat resemble flavipes, Sm.^ 

 but the clypeus and antennse are very different. 



The number of females of the musca group available is 

 very small, and the colour and markings vary much in the 

 same species. Except in the case of mackayensis I do not 

 feel sufficiently certain as to the correct association of tJie 

 sexes to venture to describe them. A form of which I 

 possess both sexes from Perth and Kalamunda, W.A., and 

 which I take to be a highly coloured variety of littoralis. 

 Turn., has the markings on the disc of the mesonotum and 

 on the five basal dorsal segments of the female well deve- 

 loped, also on the six basal segments of the male, the clypeus 

 in both sexes being yellow with a small black mark on each 

 side near the base, and the fore tarsi in both sexes are without 

 the black marginal line which is present in specimens of 

 littoralis taken in the same locality. I have referred to this 

 form in my key as a variety of littoralis, but it is quite 

 possible that it may prove to be distinct when specimens are 

 available for the dissection of the male genitalia. 



Ann. d& Mag. JS. Hist. Ser. 8. Vol. xvi. 31 



