BY CHARLES P. ALEXANDER. 109 



tergite subquadrate, with a small U-shaped median notch* 

 the lateral lobes broadlj^ subtruncate. Pleural appendages 

 at the end of the rather shoi't fused sterno-pleurite. Eighth 

 sternite unarmed. 



Habitat. — North Queensland. 



Holotype, ,$, Gordonvale, December, 1917 (J. F. 

 Illingworth). 



The type specimen was taken at light. 



This species must be considered as being an aberrant 

 member of the genus Ctenacroscelis. The structure of the 

 male hy|3opygium and the ctenidium are quite character- 

 istic of this genus but the course of vein E^ differs from 

 that of other species of Ctenacroscelis and very nearly 

 approximates the normal condition in the genus Tijjula. 



Genus Nephrotoma Meigen. 

 1803, Nephrotoma Meigen, Illiger's Magazin, vol. 2, p. 262. 



Nephrotoma australasioi (Skuse). 

 1890, Pachyrrhirui Australasioe Skuse, Proceedings of the 

 Linnean Society of New South Wales, vol. .") (ser. 2), 



p. 126, pi. 5, fig. 20. 



(J $, Cairns, September, 1917 (J. F. Illingworth). 

 (J $, Mossman, May, 1919 (J. F. Illingworth). 



