Diptera.] 



SUBANTARCTIC ISLANDS OF NEW ZEALAND. 



133 



Thorax. — Ground-colour brown, with a central grey stripe. This is narrow in 

 front, but broadens out in a trumpet-shape to the scutellum. This stripe is bordered 

 along the stalk of the trumpet by a narrow dark-brown line. Pleurae dark grey. 

 Scutellum grey, like the stripe. Halteres yellow. 



Abdomen greyish-green. 



Legs black, except the tips of all the knees, which are narrowly reddish. 



The genitalia in Aphrosylus differ considerably with the species. The present 

 insect has small outer lamellae, which are subtriangular in form ; the inner are 

 much chitinized, and are larger than the outer pair. 



Hab. — Bounty Islands. 



Type. — Cambridge Museum. 



SYRPHIDAE. 



Some specimens belonging to the genus Syrphu^ were sent both from Carnley 

 Harbour and from Campbell Island. All these can be fairly referred to the species 

 S. novae-zenlandiae. It is impossible to be sure of the limits of species in such a 

 difficult genus as Syrphus without a good deal of material, and in the absence of 

 this it seems best to put all the species sent under the above name. 



Helophilus, Meigen. Syst. Besch., iii, 368 (1822). 



Helophilus interruptus, sp. nov. 



A female specimen of the above genus was collected by Messrs. Des Barres and 

 Chambers at Campbell Island. It is superficially very like a rather small H. tri- 

 linecUus. The points of difference are tabulated below : — 



Irilinenlus, ? 



A pronounced facial tubercle. 



Thorax of a grey ground-colour, with 3 

 broad black stripes. 



Front tibiae yellow. 



with dark - rufous 



Hind femora rufous inside and on the 



distal half outside. 

 Hind tibiae orange, 



base. 

 Wing-veins yellow-brown. 

 Discal cross-vein oblique, and somewhat 



S-shaped. 

 No stigmatic colour. 



Hab. — Campbell Islands. 

 Type. — Cambridge Museum. 



interruptus, J 



No real tubercle ; the whole face is formed 

 of a rounded swelling. 



The ground-colour yellow-grey, with 3 

 broad black stripes, the centre one 

 having a median grey line not extend- 

 ing to the ends of the black one. 



Front tibiae yellow, with a black ring at 

 the end. 



Hind femora all black. 



Hind tibiae black, with broad yellow 



central band. 

 Wing-veins black, and slightly infuscate. 

 Discal cross- vein oblique, but only bent 



where it is crossed by the vena spuria. 

 Well-marked black stigma. 



