1 



J 



Miller. — The Diptera Fauna of New Zealand. 297 



Genus Cheilosia Panz. (1809). 



Rather robust flies, more or less rectangular in outline ; wings sometimes 

 not extending beyond abdomen ; eyes bare or hairy, holoptic or dichoptic 

 in the male, broadly dichoptic in the female ; head more or less rectangular 

 in profile ; face with a prominent central knob ; antennae of species 

 described below lying flat on face, the 3rd joint orbicular ; legs at times 

 peculiarly haired, the anterior and posterior tibiae and tarsi sometimes 

 broadened. 



Two of the four new species described below — G. howesii and C. lepto- 

 spermi — are represented one by a female and the other by a male ; they 

 are singularly similar in many respects — so much so that they might readily 

 be taken for the one species. However, I think there is sufficient reason 

 to separate them, mainly on the character of the anal angle and alula of 

 the wing, which are so markedly different in the two. The other two 

 species are quite distinct. 



Table of Species. 



'Anal angle of wing nearly right-angled ; alula long and narrow, 

 reaching almost to anal angle ; abdomen dull bronzy blue, 

 the apical segment brilliant cupreous . . . . . . leptospermi n. sp. 



Anal angle and alula normal . . . . . . . . 2 



' Thorax and abdomen blue-black, the latter broadest across the 



middle; length, 9 mm. .. .. .. .. cunninghamin. sp. 



(Thorax bronzy or cupreous ; abdomen rectangular .. .. 3 



Thorax shiny bronze ; abdomen violet-blue and comparatively 

 „ short ; length, 6 mm. . . . . . . . . howesii n. sp. 



Thorax brilliant cupreous ; abdomen dull blackish-brown and 



rather elongate ; length, 10 mm. . . . . . . ronana n. sp. 



C. leptospermi n. sp. 



A rather small, short-bodied, immaculate fly with the anal angle and 

 alula of the wing well developed. 



cJ. Eyes bare, holoptic, somewhat coppery ; long black erect hairs on 

 vertex ; front and ocellar triangle bronzy, the former clothed with silvery 

 or greyish hairs ; lunular area shiny tlark-blue, unusually large and semi- 

 circular. Antennae short, broadly separated at insertion, and lying flat on 

 face (fig. 14) ; 1st and 2nd joints bare, bronzy, together a little longer than 

 the 3rd, which is short, orbicular, and reddish-brown ; arista reddish-brown, 

 short and thick but abruptly tapering apically. Face bronzy-black with 

 a dense greyish pubescence and scattered silvery hairs, the protuberances 

 bare ; face (fig. 15) descending slightly forward beneath antennae and 

 thence abruptly outward to the prominent knob, below which at the oral 

 aperture is a truncated protuberance which, in front view, is cup-shaped 

 and divided by a perpendicular median ridge ; below this, on each side, 

 the lower angles of the face are rounded, swollen, and somewhat descending ; 

 oral margin shiny blue-black ; a shiny blue-black stripe running diagonally 

 forward from the cheeks at oral margin on to the face between the orbits 

 and anterior oral margin ; cheeks blue-black clothed with a greyish tomen- 

 tum and scattered silvery hairs ; occiput shiny deep blue ; proboscis and 

 palpi blackish-brown. 



Thorax and scutellum shiny cupreous, the sternopleurae rather blackish 

 blue ; dorsum clothed with short white hairs, becoming longer on the meso- 

 and ptero-pleurae ; pleurae with a greyish reflection. Legs purplish-black 

 and coppery, somewhat shiny ; the tibiae, which are rather swollen apically, 

 are brown at extremities ; knees brown : on the underside of the anterior 



