330 Transactions. 



blackish-grey with lighter reflections, the former clothed with greyish 

 hairs ; a silvery spot at lower eye-angle ; proboscis blackish-brown, the 

 palpi paler. 



Dorsum of thorax rather densely clothed with short black hairs ; dull 

 black with 4 indistinct blue-grey stripes and a very narrow medio- 

 longitudinal one. The dorsum shows a shiny bluish and faintly metallic 

 tinge towards the scutellum ; pleurae blue-black with a greyish reflection, 

 and clothed, anterior to the wings, as the dorsum ; thoracic spiracles 

 tawny ; a brilliant orange-yellow spot beneath the root of wings ; scutellum 

 shiny, dark brown except for orange-yellow apex, and clothed with black 

 hairs ; in some cases the yellow almost covers the whole scutellum. Wings 

 clear, the stigma faintly tinged, veins blackish -brown ; squamae and 

 anti-squamae tinged and margined with black, the former fringed with 

 long black branched hairs and the latter with short hairs ; halteres 

 brownish-yellow. Femora blue-black with a greyish reflection and clothed 

 with white hairs ; posterior femora broad, with a yellowish area beneath 

 at apex and short spines along lower side distally ; tibiae and tarsi 

 brownish-black ; the anterior and middle tibiae paler brown basally ; the 

 posterior rather produced to a blunt inferior process apically ; tarsi with 

 lighter reflections, golden on the posterior pair. 



Abdomen indistinctly clothed with short white hairs, longer at sides of 

 apical segments and merging into brownish hairs along sides of 1st and 

 2nd segments ; 1st segment dull, the remainder brilliant violet-blue, at 

 times with a greenish tinge more distinct in some specimens ; vestiture on 

 2nd, 3rd, and 4th segments arranged as a pair of indistinct areas separated 

 in the middle by a longitudinal dull-black spot which arises from the 

 anterior margin, narrows, thence widens, and ends before reaching the 

 posterior margin. 



$. Eyes dichoptic ; frontal orbits parallel half-way down the front, 

 thence divergent ; from the angles thus formed on each side a shining black 

 triangle projects across front, forming a bare transverse area ; in some 

 specimens 3rd antennal joint not margined with blackish-brown but merely 

 with a brownish area at insertion of arista ; genitalia orange-yellow. 



$. Length. 9 mm. $. Length, 11 mm. 



Plesiotype : No. 1244, D. M. 



Habitat. — Throughout New Zealand. 



H. campbellicus Hutton. 

 H. campbellicus Hutton, Trans. N.Z. Inst., vol. 34, p. 170 (1902). 



A moderately large sombre-coloured fly with an indistinctly-striped 

 thorax, bronzy to bluish-green abdomen, and tawny scutellum. 



$. Eyes bare ; front blackish-brown with a dense vestiture of blackish 

 hairs and greyish reflections on lower half, becoming silvery along orbits ; 

 lunular area large and tawny, narrowly margined behind with black, the 

 posterior margin cleft by a median groove ; 1st and 2nd antennal joints 

 black, 3rd joint orange -red broadly margined with black ; arista black. 

 Face (fig. 69) moderately concave beneath antennae, the protuberance and 

 a broad area on each side bare and tawny ; in some of the New Zealand 

 specimens there is a black or brownish central stripe ; remainder of face 

 brownish-yellow with black and silvery reflections and clothed with silvery 

 hairs ; oral margin broadly margined with black ; facial orbits silvery 



