Genus Berismyia Giglio-Tos. I have placed the following species, Exaireta alpina of Hutton, in this genus on account of the position of the antennae below the middle line of head and the presence of only three posterior veins in the wing. I have no specimens of this species at my disposal beyond Hutton's type species, which is a female. B. alpina. Exaireta alpina Hutton, Trans N.Z. Inst., vol. 33, p. 5 (1901). ♀. A moderately large fly with bluish-green thorax and the abdomen dark tawny, the sides of which and the posterior margin of each segment dark green; legs tawny and wings yellowish. At first sight this species resembles in colour the female of A. opposita, but its much larger size and margined abdomen, as well as the position of the antennae and number of posterior veins, at once place it as a distinct species. Eyes dichoptic, bare, occupying side of head in profile, a faint depression a little above the antennae. Ocellar triangle and front blue-black and shiny, the former more or less prominent and the latter with a patch of silvery-grey tomentum above the antennae, which are elongate, being longer than width of head, and situated below the middle line (fig. 11); black in colour but for base and underside of 1st segment of the 3rd joint, which is dark tawny; 1st and 2nd joints bristly, the latter half as long as the former; 3rd joint composed of 8 segments, densely pubescent, and terminating in several short and delicate hairs. Face shorter than front and strongly receding, covered by a silvery-white tomentum (black in certain lights), along which is a dark medio-longitudinal and narrow stripe. Proboscis pale tawny palpi large and projecting in front of proboscis; penultimate joint elongate and narrow, longer than the ultimate, and pale tawny with delicate hairs; ultimate joint fusiform, about two-thirds length of preceding, tawny at base and on inner side, otherwise black. Occiput shiny black, more or less rounded, with some scattered silvery tomentum above but hairy below, and produced backward at the oral margin. Thorax brilliant bluish-green, especially the pleurae, the sterno-pleurae a darker green; the dorsum with a scattered greyish tomentum, the pleurae with silvery hairs. Humeral and post-alar calli dark tawny, the latter golden in certain lights. Scutellum brilliant bluish-green margined with tawny, the 4 spines short and dark tawny. Wings tinged with yellow, deeper at the base and in costal and marginal cells, veins yellow; costal cell broadened slightly; 1st submarginal cell proximally obtuse, the 1st section of 3rd vein not quite as long as anterior cross-vein, which is slightly oblique anteriorly (fig. 12); 3rd vein slightly sinuated, the anterior branch arising at right angles from the middle and strongly bent to the costa; only 3 posterior veins, there being no sign of a 4th; vein between discal and 4th poster or cells not quite twice length of anterior cross-vein. Distance from the margin of the confluence of the 5th and 6th veins not twice the length of anterior cross-vein. Anal angle strongly rounded. Halteres yellow. Legs tawny, the femora and tibiae stout, the posterior femora thickened; anterior tarsi fuscous, especially the protarsi. Abdomen with 7 visible segments about as wide as thorax, oval or almost rectangular excluding the 6th and 7th segments (fig. 13). The whole tawny, but segments 1 to 5 bordered along the sides by deep shiny-green which is continued across the middle of the 1st segment; the 2nd to 5th