Hutton. — On New Diptera. 193 



longitudinal ends at the apex of the wing ; the third longi- 

 tudinal ends inside the tip of the posterior branch of the 

 fourth. Anterior branch of the fifth is nearly straight ; the 

 posterior branch runs near the anterior for some distance 

 and then turns abruptly down to meet the posterior margin. 

 Length, 2 mm. ; wing, 2^-mm. 

 Hab. Christchurch (F. W. H.). 



Family BIBIONID^. 



Genus Dilophus, Meigen, 1803. 



Two basal cells ; the third longitudinal vein simple ; no 

 (iiscoidal cell. Head almost entirely occupied by the eyes in 

 the male, very small and inclined in the female. Palpi 5- 

 jointed ; the third joint dilated. Antennae cylindrical, in- 

 serted beneath the eyes ; 11-jointed ; the third joint a little 

 larger than the others ; the last four hardly distinct from 

 each other. Eyes hairy in the male. Prothorax elevated, 

 with two series of spines. Legs hairy ; the fore femora thick 

 and grooved ; the tibiae spined in front and terminated by a 

 coronet of eight spines ; tarsi with three pulvilli. 



Dilophus nigrostigma. 



Bibio nigrostigma, Walker, Cat. Dipt, in Brit. Mus., p. 121 

 (1848). Dilophus spectabilis, Nowicki, Mem. der Kra- 

 kauer k.-k. Akad. d. Wissen., band 2, p. 10 (1875). 



Male. — Black, shining, thinly clothed with black hairs. 

 Wings brown, stigma and anterior veins black; the others 

 tawny. Length, 6|-7£ mm. ; wing, 6 mm. 



Female. — Thorax variegated with red and black ; the fore 

 coxae and all the femora red ; the latter with black tips. The 

 rest as in the male. Length, 9 mm. ; wing, 9 mm. 



Hab. Auckland ; Ashburton. 



The legs are hairy in both sexes. 



Variety zealandicus, Walker, Trans. Ent. Soc. of London, 

 1858, p. 235 (Bibio), differs only in the abdomen of the 

 female being ferruginous beneath. 



Hab. Auckland ; Wellington ; Chatham Islands. 



If it should be proved that the variety zealandicus is of 

 any importance, and not merely individual, we must then 

 consider this species as dimorphic, for it is impossible, I 

 think, to distinguish the males. 



Dilophus insolitus, sp. nov. 



Male. — Black, the legs brown and the eyes red ; wings 

 clear, with a brown stigma. Fore and middle femora in- 

 flated ; the hind legs elongated, with the femora and tibiae 

 13 



