Page:Transactions NZ Institute Volume 33.djvu/32

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Exaireta spiniger.

Xylophagus spiniger, Weidemann, Ausser-Europ. Zweif. Ins., ii., p. 618 (1830); Hutton, Cat. Dipt. N.Z., p. 35; Hudson, Man. N.Z. Ent., p. 56, pi. vi., fig. 5. Beris servillei, Macquart, Dipt. Exot., i., p. 176, pi. 21, fig. 1 (1838).

General colour black, the abdomen with violet reflections. Eases of the femora white, the tarsi yellowish. Wings with the outer half blackish, except a clear spot near the base of the submarginal cell. Length, ♂ 9-10 mm., ♀ 13-15 mm.; of the wing, ♂ 7-8 mm., ♀ 11-12 mm.

Hab. Auckland (Colonel Bolton); Whangarei and Wellington (F. W.H.).

Weidemann gives Australia as the habitat of this species, while Macquart says that the habitat is unknown. In the "Voyage of the 'Novara'" both Sydney and Auckland are given. Schiner made it the type of his genus Exaireta.

Exaireta apicalis.

Beris apicalis, White, Voy. "Erebus" and "Terror," pi. 7, fig. 17; Cat. Dipt, in Brit. Mus., p. 126. Diphysa apicalis, Walker, Cat. Dipt. Brit. Mus., p. 1151 (1849); Hutton, Cat. Dipt. N.Z., p. 34. Exaireta analis, Nowicki, Mem. d. Krakauer k.-k. Akad. d. Wisseu., band ii., p. 11 (1875); Hutton, Cat. Dipt. N.Z., p. 36.

Thorax dark reddish-brown, sometimes slightly aeneous, and with short golden hairs; the humeral callus tawny or rufous; scutellum tawny, abdomen tawny, the tip purplish-black. Wings ochraceous, with a transverse brown band from the costa to the discal cell; branch of the third longitudinal vein margined with dusky. The intercalary vein from the discal cell does not reach the margin. Length, 7-8 mm.; wing, 6-7 mm.

Hab. Bay of Islands (Sir J. Hooker); Auckland (Captain Broun); Wellington (Hudson); Otago (E. W. H.).

There are five distinct joints in the flagellum of the antennae, of which the first and fourth are much longer than the others. Probably the fourth is made up of several.

Exaireta straznitzkii.

E. straznitzkii, Nowicki, Mem. Krakauer Akad. Wissen., ii., p. 14 (1875); Hutton, Cat. Dipt. N.Z., p. 36.

Thorax dark-red, with black lines (not very distinct); the humeral callus tawny. Abdomen purplish, the tip not darker than the rest. Wings ochraceous, with an oblique brown mark from the submarginal cell to the discal; the

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