116 NEW YORK STATE MUSEUM 



Genus 12. Halirytus Eaton 

 Ent Ma Mag. 12:60. 1875. (P1.37, figs. 5, 6, 7) 



Imago, female. Head suborbicular, palpi very short, two- 

 jointed; antennae divergent, six-jointed, the basal joint very large, 

 nearly orbicular, the next four much smaller, submoniliform, the 

 apical joint oval, about as long as the preceding two together; 

 the basal joint has one rather short and a few still shorter bris- 

 tles near its middle, and the apical joint has a short bristle on 

 one side, and a finer hair on the other side near its base, and 

 some extremely minute pubescence, which is hardly discernible 

 even under the microscope (fig.7) ; genae each with one minute 

 bristle below the eye; epistome scutiform; eyes suborbicular, 

 protuberant, close to their upper orbit behind are three short 

 bristles, the hinder two are near together; ocelli absent. Meso- 

 notum somewhat cucullate, being strongly arched in front and pro- 

 jecting forwards above the head ; scutellum semi-elliptical, promi- 

 nent, with a transverse line of minute erect bristles; metanotum 

 very transverse, exceedingly short; the spiracles on each side of 

 the mesothorax are very prominent; wings rudimentary, some- 

 what narrowly obovate, reaching to the apex of the first abdominal 

 segment; halteres small, clavate and slender; legs very long, the 

 posterior tibiae not thickened nor spurred ; the proximal joints of 

 the tarsi very long, ungues and pulvilli very small. Abdomen 

 with seven dorsal and six ventral segments (exclusive of the 

 base supporting the valves of the ovipositor), subcylindric ; ovi- 

 positor pointed obliquely downwards, composed of a stout basal 

 joint terminated by a pair of acute short lanceolate lamellae en- 

 closing a smaller pair of spicules. Male unknown. 



The larvae probably feed on Enteromorpha. The species 

 is found on the Kerguelen Island. Type of genus is H. a m p h i - 

 b i u s, Eaton. 



This genus is akin to Corynoneura, from which it is 

 separated by its two- jointed palpi, the comparative nakedness of 

 its antennae, its entire eyes, the spurless tibiae of which the 

 hind pair is not thickened, its rudimentary wings, and perhaps 

 by the number of abdominal segments. If the portion reckoned 

 above as the base of the ovipositor be regarded as a segment, then 

 there is no difference between these genera in that last particular. 



