672 Mr. J. E,. Malloch on Exotic Mascarldae. 



the basal abdominal sternite hairy, bare in whitei ; hind 

 femur with more widely-spaced antero-ventral bristles, which 

 are comparatively longer apically than in whitei, the postero- 

 ventral surface with more distinct setulose hairs apically 

 and less noticeable hairs basally ; and the hind tibia with an 

 antero-ventral bristle, which is absent in whitei. The facial 

 ridges are aUo not haired so far up as in that species. 



Female. — This I erroneously listed as the allotype of 

 tvhitei in Part VI. of this series of papers. Similar to the 

 male, except in having a wide frons. 



Length 8-9 mm. 



1'ype, male, allotj^pe, and one male paratype, Barrington 

 Top, New South Wales, 13-17. xii. 1921 (G. Goldfinch). 

 Paratype female, Mangalore, Tasmania, 22. ii. 1913 (A. 

 White). 



I have also before me two females from Sydney, N.S.W., 

 and two from Gisborne, Victoria, that apparently belong to 

 this species, though they are a little smaller. 



A peculiar fact is that all the females have some hairs on 

 the hypopleura below the spiracle, while the males have the 

 hypopleura bare, or with one or two hairs near the posterior 

 lower angle. 



lluns to whitei in the key already referred to, but is dis- 

 tinguished by the hairy basal abdominal sternite in both 

 sexes and the narrower frons in the male. 



Type returned to Department of Public Health, Sydney ; 

 paratype in British Museum. 



Helina vandiemeni, sp. n. 



Female. — Very similar to antarctica, Macquart. Differs 

 from it in having the second antennal segment, base of third, 

 and the palpi rufous-yellow instead of black. Fore coxae 

 rufous-yellow, with a fuscous spot at base in front, not black 

 as in antarctica. 



Structurally and in chsetotaxy similar to antarctica. The 

 arista is plumose in both, there are no well-developed pre- 

 sutural acrostichals, the prealar is of moderate length, and 

 there are four pairs of postsutural dorso-centrals. The hind 

 femur in the new species has fevver and shorter bristles on 

 antero-ventral surface, and they do not extend over more 

 than the apical half. The halteres in antarctica are 

 brownish, while in the new species they are pale yellow. 

 The eyes are slightly hairy in both sexes. 



Length 8 mm. 



Type, and two paratypes, Hobart, Tasmania {A. M. Lea). 



