BY ARTHUR WHITE. 203 



the brown colour being curved up in a half circle above 

 the base of the cubital fork, in the middle of which hyaline 

 half-circle is a brown spot, and there are also brown spots 

 at each lower corner of the discal cell, and at the apex of 

 the second basal cell ; number of submarginal cells two ; 

 the four posterior and anal cells all open ; the radial vein 

 strongly recurrent before reaching the costa. 



Female resemblesi the male very closely, but has the eyes 

 more widely separated. 



Variation. This species varies greatly in size, extremely 

 small specimens being sometimes met with. 



C. geometrica is a commo^n species. It first appears to- 

 wards the end of September, and may be found settled on 

 the ground in warm sunny places throughout the early 

 summer. 



COMPTOSIA CORCULUM, Walk. 

 Syn. Anthrax corculiun, Walk. 

 Comj^tosia tricellata, Macq. 

 Judging from Macquart's description, I think that there 

 is little doubt that his C. tricellata, described from Tas- 

 mania, is the same as C. corculum, a^ well-known mainland 

 species. This species resembles C. geometrica very closely, 

 but is distinguished by possessing three instead of two sub- 

 marginal cells. I have not met with it in Tasmania per- 

 sonally. 



47. D c I D M Y I A, Gen. nov. (Fig. 37.) 



Antennje much shorter than the head, the first and 

 second ioints rounded, the third bulb-shaped, without a 

 style ; abdomen very narrow and cylindrical, both thorax 

 and abdomen practically bare ; legs short, without bristles ; 

 wings with the radial vein strongly looped and slightly re- 

 current ; first posterior and anal cells wide open ; number 

 of submarginal cells two. 



Fig. 37. Wing of Docidomyia puellaris. 



Head large, broader than the thorax. Proboscis con- 

 cealed within the oral aperture. Eyes in male narrowly 



