G68 Mr. J. E. Malloch on Exotic Muscaiid^. 



brownisli-grey pruinescent on thorax and abdomen, tlie latter 

 lacking the dorso-central vitta ; the legs are normal, the 

 liind tibia has one antero-dorsal and two antero- ventral 

 bristles, and the outer cross-vein is not as long as penulti- 

 mate section of fourth vein. 



Length 3-4 mm. 



Ty2^e, male, allotype, and three paratypes. South Queens- 

 land {T. L. Bancroft). Paratypes, two males and four 

 females, Kendall, New South Wales ; one male and six 

 females without locality but labelled " about cows,^^ sent by 

 Department of Public Health, Sydney, New South Wales. 



Like occulta, Meigen, of Europe and North America, 

 which it greatly resembles in the female sex, this species 

 will probably be found in the larval and pupal stages in cow- 

 dung. 



Tlie only Australian species of this genus previously de- 

 scribed is fuscocalyptrata^ Macquart. This differs in being 

 over 6 mm. in length, and in colour, as well as in the 

 venation and the armature of the fore femur, judging from 

 the original description. I have not seen the species. 



Hydrotma nuhilicosta, sp. n. 



Female. — Black, distinctly shining. Ocellar triangle, 

 orbits, and parafacials glossy black, interfrontalia brown 

 when viewed from in front. Thorax with slight grey 

 pruinescence and very faintly vittate. Abdomen unmarked. 

 Legs black. Wings very noticeably browned on front half, 

 most conspicuously so from apex of costal cell to apex of 

 wing. Calyptrse white. Knobs of halteres black. 



Eyes bare ; frons normal, the triangle short, not extending 

 to the cruciate bristles ; arista with very short pubescence. 

 Thorax with numerous fine hairs on the presutural acro- 

 stichal area, one or two pairs of the hairs near margins 

 posteriorly stronger but not conspicuously so. Fore tibia 

 without a posterior median bristle ; mid-tibia with two pos- 

 terior bristles ; hind femur with a long fine hair near base 

 on ventral surface and a series of fine bristles on antero- 

 ventral surface, the longest one about one-fourth from apex ; 

 hind tibia with one postero-dorsal, one antero-dorsal, and 

 one or two antero-ventral bristles. Outer cross-vein almost 

 straight; first posterior cell slightly narrowed apically. 



Length 6 '5 mm. 



Type, Villavicencio, Quatiquia lliver, Columbia, 400 feet, 

 xi.-xii. 1914 {Dr. A. Balfour). 



