48 THE DIPTERA-BRACHYCERA OF TASMANIA, 



row, conical in the male, but greatly lengthened in the 

 female; genitalia of the male extended and conspicuous. 

 Legs slender, of medium length, the tibia? bearing short 

 bristles. Wings either without markings or spotted or 

 banded ; the fourth posterior cell — in Australian species — 

 always open. 



This genus is distinguished from Anabarrhynchus in 

 both sexes by the much more slender shape and the bare 

 front, and, in the male, by the joined eyes and extended 

 genitalia, 



The species that I have placed here are not altogether 

 a homogeneous group, but a9 they all agree with the char- 

 acterisation of the genus given above, it seems unnecessary 

 to divide them. The most aberrant species — P. saxatilis — 

 which is distinguished by the furrowed eyes, might pos- 

 sibly be made the type of a new genus. The venation of 

 von Krciber's genus Belonalys is very similar to that of 

 Psilocephala lutea and P. occulta, and the genus may 

 belong here. 



TahJc of the Tasmanian Species of Psilocephala. 



1. Eyes without furrows. 2 

 Eyes with furrows. 5 



2. Wings absolutely without markings. 3 



3. Antennae black ; thoracic stripes black ; a large 



grey and black species. Nudifemorata, Macq. 



Antennae orange ; thoracic stripes light, brown ; a 



large orange-brown species. Lutea, Sp. nov. 



Antennas orange; thoracic stripes grey; very small 



species, with silvery tomentum in the male. 



Nitens, Sp. nov. 

 Wings with black markings. 4 



4. Abdomen black-brown, with seventh and eighth 



segments orange ; legs yellow. 



Venusta, Erichs. 

 Abdomen entirely black-brown ; legs black and 

 brown. Occulta, Sp. nov. 



5. Thorax covered with small brown spots; wings 



spotted. Saxatilis, Sp. nov. 



Of the above species /'. nudifemorata and P. venusta 

 are unknown to me, and for their distinguishing charac- 

 ters I rely on the published descriptions. 



Psilocephala nudifemorata, Macq. 

 Syn. Therera nudifemorata, Macq. 

 This species is described by Macquart as having the 



