Miller. — The Dipt era Fauna of New Zealand. 187 



B. substituta Walker. 

 B. substituta Walker, Cat. Dipt. B.M., Supp., 5, p. 12 (1851) ; Hutton, 

 ib., p. 6. Actina substituta Hutton, Cat. Dipt. N.Z., p. 34. 

 " Dull green or aeneous green. Antennae black. Palpi testaceous. 

 Scutellum with 4 tawny spines. Abdomen purplish-cupreous. Legs tawny, 

 femora and tibiae with brown bands. Wings greyish, the stigma and veins 

 black. 



"This species has 3 externo-medial veins, and the 1st branch of. the 

 cubital vein is very short, proceeds almost directly to the border, and thus 

 forms an unusually large angle with the second branch. 

 " Length, 2 lines ; wings, 3| lines. 

 ''Auckland (Colonel Bolton)." — Walker, I.e. 



B. violacea Hutton. 



B. violacea Hutton, Trans. N.Z. Inst., vol. 33, p. 6 (1901). 



$. Eyes broadly dichoptic with minute and scattered hairs ; front 

 broad, shiny blackish-brown with short scattered greyish hairs, and, above 

 the antennae, a patch of greyish pubescence dead-black in certain lights 

 and notched on the posterior margin. Antennae below middle line of 

 head, long but not as long as width of head ; 1st joint shiny black, the 

 2nd light brown, and both bristly (fig. 14) ; flagellum linear, covered by a 

 dense stifE and black pubescence giving a tawny reflection in certain lights, 

 composed of 7 almost equal segments except the ultimate which is about 

 twice the length of the penultimate, both of which having terminal hairs. 

 Face broad, shiny black with a few scattered silvery hairs ; proboscis tawny 

 and thinly hairy, palpi (fig. 15) 2-jointed, both of about equal length and 

 projecting beyond the proboscis ; 1st joint blackish and hairy, the 2nd 

 brown with a darker apex, fusiform, minutely pubescent, and terminating 

 in 3 bristle-like hairs. Occiput shiny black and depressed, hairy below. 



Dorsum of thorax dull - bronzy with dull - greenish reflections and a 

 finely punctured appearance ; pleurae shiny blue-black and slightly hairy. 

 Scutellum coloured as dorsum, with 4 light-brown but not large spines. 



Wings clouded with greyish-brown but clear toward the apex ; veins 

 brown ; stigma dark brown ; base of the wing and anterior part of the 

 costal cell clearer. First section of 2nd longitudinal vein about twice as 

 long as anterior cross-vein, the 2nd section but slightly bent into the 

 1st submarginal cell ; 1st section of 3rd vein a little longer than anterior 

 cross-vein, which is perpendicular ; 3rd vein curved upward to the bifur- 

 cation and thence sinuated downwards to the costa, the anterior branch 

 arising almost at right angles and but very slightly bent to the costa (fig. 16) ; 

 basal cells closed behind by an oblique transverse vein, the vein separating 

 those cells represented by a furrow and clear line along which the mem- 

 brane easily splits ; confluence of the 5th and 6th longitudinal veins distant 

 from the margin about three times the length of anterior cross- vein. Halteres 

 with greyish-white heads and darker stalks. 



Legs banded with dark and light brown, the proximal portions of each 

 joint being of the latter colour, less distinct on the middle and anterior 

 legs and more especially the latter, the tibiae of which have also a light- 

 brown marking in the middle; posterior tibiae dark brown. The protarsi 

 barely one-half as long as the whole joint, mostly light brown but for the 

 apex, the remaining tarsal segments dark brown except for a light-brown 

 band (sometimes indistinct) at the origin of each, but the anterior and 

 middle tarsi vary from light to dark according to the light. 



