198 THE DIPTERA-BRACHYCERA OF TASMANIA, 



panded. Eyes bare, joined in male, separated in female. 

 Antenn?e apj^roximated at the base^, the first joint slender 

 and much longer than the second, the third as long as, or 

 considerably longer than, the first two together, varying- 

 ill form in the different species. Thorax slightl}^ arched. 

 Abdomeai short, about equal in breadth to, or a little 

 broader than, the thorax ; both thorax and abdomen cloth- 

 ed with dense, furry pubescence. Legs of medium length ; 

 posterior femora spinose beneath; tibice with conspicuous 

 bristles. Wings with both the first posterior and the anal 

 cell open ; the first and second basal cells of almost equal 

 length , radial vein varying much in the different species, 

 sometimes nearly straight, at others boldly curved up to- 

 wards the costal margin. 



This genus may be easily recognised by the open first 

 posterior ceil in conjunction with the fi.rst and second 

 basal cells of almost equal length. It is one of the most 

 characteristic Australian genera,, and contains a consider- 

 able number of species, which, though resembling those of 

 Bomhylius, have yet a cnaracteristic appearance of their 

 own. Two species have been recorded from Tasmania, 

 whilst a third species, Bomhylius alhicinctus, Macq, pro- 

 bably belongs here. The last named species is described 

 as being red-haired ; abdomen with a white stripe ; femora 

 black; tibiae red; wings hyaline with foremargin fuscous:; 

 length, female, 6mm. 



Table of the Tasmanian Species of Sisyromyia. 



1. Abdomen with a bright yellow centre stripe; 



wings dark grey with the base ferruginous ; large 

 species. Aurata, Walk. 



2. Abdomen unstriped, clothed in uniform long yel- 



low pubescencei; wings hyaline with foremargin 

 brownish ; small species. Brevirostris, Macq. 



Sisyromyia aurata, Walk (Fig. 35). 

 Syn. Bomhylius auratus, Walk. 



Bomhylius crassirostris, Macq. 



Thorax and abdomen black, covered with dense, but 

 rather short, golden pubescence ; abdomen with a broad, 

 bright yellow, median stripe ; femora and tibiae pale red ; 

 wings dark grey with the base ferruginous. 



Length. Female, 12 mm. 



Hab. "Tasmania and Western Australia" (Walker); 

 also in South Australia. 



