34 Transactions. — Zoology. 



Liancalus vagus, sp. nov. 



Metallic greenish-bronze ; the head dark-brown ; the eyes- 

 red. Second joint of the antennae with short bristles, the 

 arista distinctly dorsal, rather short, curved. A few short 

 bristles on the vertex and occiput. Wings clear, the veins 

 piceous ; the second longitudinal turning forwards at the tip ; 

 the third longitudinal curving backwards ; the fourth longi- 

 tudinal straight ; posterior cross-vein nearer the margin than 

 its length. Legs greenish-bronzy ; the bristles of the fore 

 femora equal, regular, rather distant ; the lower edge of the 

 fore tibia? with a row of bristles shorter than those on the 

 femur, but with a stronger one at the tip. The other legs 

 with a few scattered bristles. Length, 3 mm. ; wing, 4$ mm. 



Eab. Christchurch (F. W. H.). 



The scutellum has four bristles. 



Genus Ostenia, gen. nov. 



First joint of the antennae rather long, nearly cylindrical, 

 without hairs ; the second joint very short, with a circle of 

 bristles ; the third joint short, transverse, with short hairs ; 

 the arista dorsal, strong, bent near its base, almost bare. 

 Eyes with very short hairs. Front broad in both sexes ; 

 bristles on the vertex and occiput. Proboscis short and stout. 

 Thorax convex above, with a transverse hollow before the 

 scutellum ; mesothorax and scutellum with bristles. Abdomen 

 large, oval, depressed, with a few short bristles ; apparently 

 of five segments in the female, six in the male. Hypopygium 

 not inflected under the abdomen, but apparently withdrawn 

 into the sixth segment. Wings rather short and broad; the 

 costa bristly. The auxiliary vein ends in the first longitudinal. 

 The first longitudinal extends to nearly half the length of the 

 wing ; fourth longitudinal simple, nearly parallel to the third ; 

 posterior cross-vein distant from the margin by more than 

 twice its length. Legs short and stout for the family ; the 

 femora and tibioB with long scattered bristles. 



This genus appears to come nearest to Xanthochlorus, 

 Loew, but it differs in the first joint of the antennas and the 

 hypopygium, as well as in its robust form, oval abdomen, and 

 short legs. I have named it after Baron Osten-Sacken. 



Ostenia rotousta, sp. nov. 

 Head and thorax brown, non-metallic ; abdomen and legs 

 darker, with submetallic reflections. Antennae and proboscis 

 piceous. Abdomen bluish-black in the male, greenish-black 

 in the female. Wings brown ; the veins dark-brown, lighter 

 near the base ; second longitudinal bent backwards near the 

 tip ; the third parallel to the second, but more bent down. 



