Miller. — The Diptera Fauna of New Zealand. 295 



a marginal fringe of scattered black hairs ; spiracles silvery ; halteres orange- 

 yellow or orange-red. Wings clear, stigma brownish, vr-ins blackish-brown ; 

 R 4 + 5 running straight between cells R 3 and R 5 ; cross-vein r-m a little 

 shorter than its distance from base of cell 1st M 2 . Legs hairy, the femora 

 somewhat thickened, the posterior particularly so ; femora blue-black with 

 greyish hairs, the posterior pair with numerous short bristles on lower 

 side near apex ; knees brownish-yellow ; tibiae brownish-yellow darkening 

 apically, the posterior pair darker and broader distally, all clothed with 

 stiff greyish hairs longer on the posterior pair, which have a stiff golden 

 pile below toward the apex ; tarsi brownish becoming black apically, and 

 clothed with stiff silvery hairs ; posterior protarsi rather swollen and with 

 a short golden brush beneath. 



Abdomen slimy blue-black, immaculate, ovate, being broader than the 

 thorax, and usually carried with the apical half turned downwards ; clothed 

 with short and scattered greyish hairs, but 1st segment with longer ones on 

 each side. 



o*. Eyes densely hairy, and holoptic over the greater part of the front ; 

 thorax and scutellum more densely and longer haired than the female ; 

 posterior tibiae silvery below toward apex, in some lights ; posterior femora 

 clothed with long erect bristle-like black hairs distally ; abdomen black, 

 slightly brown in recently emerged specimens, more hairy than female, 

 the hairs black. Genitalia black ; the genital segments, except the 9th, 

 clothed with delicate hair-like bristles ; claspers long and bifid (fig. 8). 



This species, when on the wing, closely resembles the native bee 

 (Halictus huttoni Cam.). 



Larva. — The larva is of the rat-tailed type, but the siphon is short 

 (Plate XLVII, fig. 3) ; the body, which is creamy-white, may attain a 

 length of 20 mm. including the siphon ; the transparent integument is trans- 

 versely corrugated, and clothed with short bristles very minute on ventral 

 surface, which otherwise is clothed with delicate hairs ; along each side the 

 integument is further broken up by longitudinal folds upon which the 

 bristles are longer and more, hair-like ; from the lateral margin of each 

 segment arises a tuft of 2 or 3 divergent bristle-like hairs which are 

 distinctly longer than the surrounding vestiture and most conspicuous on 

 the terminal segments, though absent on the ultimate segment, which is 

 frequently withdrawn. The '' pro legs," which are armed with strongly 

 recurved spines, vary in shape according to the contraction or expansion 

 of the segments, being prominent knob-like swellings or merely transverse 

 ridges of the integument. A characteristic feature is the form of the 

 anterior segment, which is longitudinally fluted on the dorsal surface 

 (fig. 9) when the anterior margin is contracted by being drawn around 

 the oral cavity, much in the same way as the mouth of a pouch is drawn 

 together by strings ; if fully expanded this segment is truncated and the 

 flutings indistinct. The anterior respiratory processes are trumpet-shaped 

 and short ; posteriorly the body tapers and the posterior angles of the 

 penultimate segment are produced and carry the tuft of 3 bristle-like 

 hairs characteristic of the body segments. The siphon is short, the tracheal 

 opening being fringed by tufts of long and recurrent setose hairs (fig. 11). 



Pupa (Plate XLVII, figs. 4, 5). — The pupa is brown in colour, the hard 

 cuticle being transversely rugose and bearing the lateral hair-tufts of the 

 larva ; in outline it is club-shaped, being strongly arched dorsally and 

 tapering posteriorly to the respiratory siphon ; the ventral surface is flat. 

 Length, 10 mm. ; greatest breadth, 4 mm. 



