Hab. Auckland (Captain Broun); Christchurch and Otago (F. W. H.). There is no difference in size between the sexes. Length, 10–12 mm.; wing, 8–10 mm. The female wants the grey hairs on the sides of the thorax, and the green margin of the abdomen is not so broad. The black of the vertex ends anteriorly in a line which is convex, or sometimes slightly emarginate in the middle. Odontomyia chloris. Stratiomys chloris, Walker, Cat. Dipt. in Brit. Mus., part v., Supp., p. 57 (1854). O. chloris, Hutton, Cat. Dipt. N.Z., p. 37. O. hypochlora, Nowicki, Mem. Krakauer Akad. Wissen., ii., p. 15 (1875); Hutton, Cat. Dipt. N.Z., p. 38. In the female the black of the vertex has a deep central square-ended notch, which extends further back than the termination of the black at the eyes. The scutellum is green with a black base. The male has grey hairs on each side of the thorax. Length, 8–10 mm.; wing, 7–8 mm. Hab. Auckland (Colonel Bolton); Christchurch (F. W. H.). Odontomyia collina, sp. nov. Antennæ piceous; spines of scutellum well developed, tawny. Halteres pale-green. Wings hyaline, the stigma and veins tawny; three posterior cells. Abdomen black above, margined with green or tawny, which is broad in the male, narrow in the female. Male.—Thorax and scutellum black. Legs tawny, the femora fuscous. Length, 6 mm. Female.—Face yellow, the black of the vertex convex in front. Thorax piceous, with yellow hairs. Scutellum green, with a black spot at the base in the centre and one at each side. Legs tawny. Length, 8 mm. Hab. Lindis Pass, Otago (F. W. H.). Odontomyia chathamensis, sp nov. Head pale-tawny (green ?) on the face, the vertex black in the female. Antennæ and proboscis black. Thorax black, with scattered fulvous hairs in both sexes, while in the male those on the sides are abundant; scutellum black margined with tawny; the spines tawny, small but distinct. Abdomen above black margined on each side with pale-tawny, which is broader in the male than in the female; below very pale-tawny. Halteres nearly white. Legs tawny, the outer surfaces of the tibiæ sometimes brown. Wings hyaline, the stigma and the outer portion of the costal cell tawny; three posterior cells. Length, 9–11 mm.; wing, 7–10 mm. Hab. Chatham Islands (Fougère).