196 THE DlPTEllA-BRACHYCERA OF TASMANIA, 



This species; may usually be recognised by its small size, 

 but may occasionally be confused with unusually small 

 specimens of B. fuscdnui^- ; from such specimens, however, 

 it may be distinguished by the complete absence of any 

 Vilack abdominal hairs, by the grcund-colour of the thorax 

 being velvet-black instea^ of drab, and by the depressed 

 golden pubescence of the thorax and abdomen. 



This species bears a considerable resemblance to B. 

 nanui<, Walk, from Western Australia. It is probably 

 distinct, but the type being in bad condition, the question 

 cannot be satisfactorily settled until more specimens from 

 Western Australia are available for com.parison. 



B. c/trij.sendefus is not a common species. It frequents 

 teatree blossom durino- the month of December. 



44. S Y s T (E c H u s, Lw. (Fig. 34). 



Thorax and abdomen very broad, and bearing long 

 furry pubescence; proboscis long, moderately slender; 

 wings with the first posterior cell closed ; anal cell open ; 

 first and second basal cells of almost equal length. 



Head small, set rather low in front of the broader and 

 considerably arched thorax. Proboscis long, moderately 

 slender. Antennae about the same length as, or rather 

 longer than, the head, the first joint considerably longer 

 than the second, the third usually longer than the first two 

 together, and terminated by a small style. Thorax and 

 abdomen broad, the latter clothed with very dense, furry 

 pubescence, which, in Australian species, is usually banded 

 and produced into tufts on either side of the apex. Legs 

 long, moderately slender; posterior femora with bristles 

 beneath ; all tibiae with short bristles. Wings frequently 

 spotted ; first posterior cell closed at a considerable dis- 

 tance above the wing-margin ; anal cell open ; first a,nd 

 second basal cells of almost eoual length. 



-1. o 



This genus has so far only been recorded from the Aus- 

 tialian region by Bigot, who placed in it a species, S. eula- 

 hiatus, which I have removed to Sisyromyia ; several of the 

 species described under Bomhylius, however, should be 

 placed liere. One of these occurs in Tasmania. 



SYSTOiCHUs CRASSus, Walk. (Fig. 34). 



Syn. Bomhylius crassus, Walk. 



Bon'hyl'ni^ plafyurus, Walk. 

 Thorax fuscous ; abdomen clothed in dense, very pale 

 brown pubescence, banded across the middle with rich, 



