208 THE DIPTERA-BRACHYCERA OF TASMANIA, 



is a specimen in the collection of the British Museum. 

 It may be recognised by having the wings cut sharply 

 into a deep brown basal half and a hyaline apical half, the 

 dividing line running obliquely from a point on the costa 

 about two-tbirds the distance from the base of wing, to the 

 posterior margin about ore third che distance from the 

 ba&e. Macquart describes the abdomen as black with 

 apex silvery, and length as 7 mm. 



Anthrax alternans, Macq. 



Front brown; thorax and abdomen brov^ nish-black, the 

 latter with two white bands; wings with the base and 

 costal half suffused with dark brown, tips and posterior 

 margin clear. 



Lenofth. Male and female, 11-12 mm. 



Hab. Generally distributed. 



Male. Head much produced in front. Face black, 

 with a little yellow pubescence. Front dark brown, with 

 short, stiff, black hairs bordering the base of antennae out- 

 wardly. Antennse black. Thorax brownish-black, with a 

 collar of stiff brown hairs; scutellum testaceous, with black 

 marginal bristles. Abdomen brownish-black, the second 

 and fourth segments with a white band, the third with a 

 very narrow yellow band, apex with whits scaly pube- 

 scence ; sides of abdomen with soft white a,nd black 

 pubescence. Logs black. Wings strongly suffused with 

 dark brown, but tips and posterior margin hyaline. 



Female resembles the male very closely, but the' eyes 

 are rather more widely separated. 



This species may be readily recognised by its brownish 

 wings and abdomen with two white bands. It seems tO' be 

 generally common in Tasmania, and in the collection of 

 the British Museum are specimens, apparently identical, 

 from Western Australia, so the species is probably of very 

 wide distribution. 



A. aUernan!^ may commonly be met with settled on the 

 ground in warm sunny places, during the spring and early 

 summer. 



Anthrax minor, Macq. (Fig. 38.) 

 Syn. Arithrax vifrea, Walk. 



A small species with perfectly clear wings; thorax and 

 abdomen brownish-black; pubescence at sides of thorax 

 yellowish-white, at base of abdomen clear white. 

 Length. Male and female, 5-8 mm. 

 Hab. Bagdad Valley. (Probably generally distributed.) 



