190 Transactions. 



B. micans Hutton. 

 B. micans Hutton, ib., p. 6. 



$. Eyes broadly dichoptic, with delicate and indistinct scattered hairs ; 

 front shiny black with a patch of silvery pubescence above the antennae ; 

 this patch is dull black in certain lights and notched on posterior margin. 

 Antennae situated below middle line, somewhat short and stout ; 1st and 

 2nd joints bristly, the former black and about as long as the latter, which 

 is brownish and square in shape ; flagellum black with a dense and stiff 

 pubescence obscuring the segmentation — however, the ultimate segment 

 is not quite twice as long. as the penultimate, both of which have distinct 

 terminal hairs (fig. 18). Face shiny black with a greyish tomentum and a 

 few black delicate hairs, while scattered over the surface are several circular 

 black spots. Proboscis pale tawny ; palpi testaceous or tawny, 2-jointed, 

 the 1st hairy and the 2nd minutely pubescent with an indistinct terminal 

 bristle. Occiput flat but not depressed. 



Dorsum of thorax rounded, of a brilliant greenish-blue with darker 

 bronzy reflections, the humeri testaceous ; scutellum coloured as dorsum 

 but narrowly margined with tawny, the spines large and tawny ; halteres 

 pale tawny. 



Legs tawny, the posterior femora and tibiae with darker reflections ; 

 the tarsi (except protarsi and proximal part of epitarsi) fuscous ; all the 

 protarsi longer than the epitarsi but not half as long as the whole joint. 



Wings yellow or faintly tinged with yellow, stigma light yellow and 

 veins yellow ; 3rd vein almost straight, the anterior branch arising at right 

 angles and but slightly curved to the costa ; 1st section of 3rd vein not 

 as long as anterior cross-vein, which is perpendicular ; vein between the 

 basal cells obsolete and represented by a limpid line ; basal cells closed 

 posteriorly by an oblique cross-vein (fig. 19). 



Abdomen brownish-black and shiny, beyond the middle broader than 

 the thorax. 



The <$ differs from the $ only in length, and perhaps in the colour of the 

 thorax, Avhich is of a more brilliant bluish-green. Button's type is a male, 

 the antennae of which are lost. 



<?. Length, 4 mm. ; wing, 3-75 mm. 



$. Length, 5 mm. ; wing, 4-5 mm. 



Habitat. — ■<$, Colac Bay, December (Howes) ; Auckland (Broun). $, West 

 Plains, Otago, October (Philpott). 



B. saltusans n. sp. 



S- Black. Head black ; eyes distinctly hairy, dichoptic, the margins 

 angulated just above the antennae (fig. 20) ; front slightly narrowing toward 

 the antennae, shiny black, and distinctly hairy. Antennae blackish-brown, 

 situated below middle line and, if anything, a little longer than half the width 

 of head ; 1st joint elongated, the 2nd about two-thirds as long as the 1st, 

 and both bristly on the upper side ; all but the first 2 segments of flagellum 

 missing ; 1st segment nearly as long as 2nd antenna! joint but broader, 

 the 2nd segment shorter, and both distinctly hairy. Face dull black with 

 distinct brownish hairs except beneath the antennae where it is bare and 

 shiny black ; oral margin shiny bluish-black ; proboscis brownish ; palpi 

 2-jointed and blackish-brown, and both presenting a peculiar segmented 

 appearance ; 1st joint bristly, the sides notched (fig. 21), from which notches 

 arise long bristle-like hairs ; 2nd joint more or less clavate, apparently 



