78 REVISION OF THE STRATI05IYID.E OF AUSTRALIA, 



sinuated than in A. incisuralis, and with a smaller stigma. 

 Length, (J 6, 9 4*5 mm. 



Hab. — Tasmania. 



This species frequents pools in the beds of mountain-streams; 

 it seems to occur very sparingly. 



5.NE0EXAIRETA Ost.-Sack. 

 {Exaireta Schin.) 

 Slender flies, with thorax non-metallic; eyes bare, separated 

 in both sexes; scutellum with four spines; wings banded. 

 This genus contains only one Australian representative. 



Neoexaireta spinigera Walk. 



Syn., Beris Servillei Macq. 



Thorax black; scutellar spines brown, with the base black; 

 abdomen purple; posterior femora black, with the base white; 

 wings with basal half hyaline, apical half dark brown, with a 

 hyaline spot on the costal margin towards the tips. Length, 

 10 mm. 



Hab. —New South Wales, Victoria, and Queensland. 



This is a common species. It may be easily recognised by its 

 banded wings. 



Subfamily ANTISSIN.E. 

 This subfamily is nearly allied to the Berince, but is distin- 

 guished by possessing only five or six, instead of seven, visible, 

 abdominal segments; the abdomen is always short and broad, 

 and of bright metallic colouring; the wings have frequently the 

 basal half of the costal margin inflated; the scutellar spines, if 

 present, are four or more in number. 



Four Australian genera are at present known. 



Tahh of the Australian Genera of Antissina'. 



1 . Abdomen very broad ; metallic blue in colour 2. 



Abdomen not very broad; not metallic blue in colour 3. 



2. Scutellum with spines: costa of wings in male greatly inflated. 



LECOGASTEK White. 



Scutellum without spines anacanthella Macq. 



3. Scutellum with rudimentary spines 4. 



4. Antennse much shorter than head antissa Walk. 



Antennffi about twice the length of head antissella White. 



