Hutton. — On, the Diptera bvachycera of Neio Zealand. 7 



In the female the flagellum of the antennae is formed by six 

 quite distinct short joints; the last one, however, is longer, 

 and may consist of two fused together. The second posterior 

 cell is shortly petioiate. 



Sub-family Odontomyinae. 



Abdomen broad, apparently with only five segments. 



Genus Odontomyia, Latreille (1809). 



First joint of the antennae longer than the second, but not 

 elongated ; the third fusiform, with five rings and a short 

 style. Eyes contiguous in the male. Scutellum with two 

 spines. Veins of the wing faint towards the posterior margin ; 

 generally with four posterior cells (three in the New Zealand 

 species). 



Key to the Species. 



Abdomen bordered with green. 



Spines of the scutellum well developed. 

 Antennae black. 



Base of scutellum black. 



Length. 10-12 mm. .. .. 0. at'wirens. 



Length, 8-10 mm. 



Hairs on sides of thorax grey, or 



none . . . . O. chloris. 



Hairs on sides pf thorax tawny 0. chathamcnsis. 

 Length 6-8 mm. .. .. .. O.colliiui. 



Scutellum green or tawny .. O. fulriccps. 



Antennae yellow . . . . . . 0. aastraliensis. 



Spines of scutellum obsolete ; length, 7 mm. . . 0. dorsalis. 

 Abdomen black .. .. .. .. .. O. angusta. 



The females can be distinguished by the outline of the 

 black on the vertex, as follows: — 



Black on the vertex, convex in front. 



Length, 10-12 mm. . . . . . . 0. atrovirens. 



Length, 6-8 mm. . . . . . . O. collina. 



Black on the vertex, notched in front . . 0. chloris. 

 Black on the vertex, conoave in front. 



Length, 9-11 mm. . . . . . . O. chathamcnsis. 



Length, 6-7 mm. . . . . . . O. dorsalis. 



Black on the vertex, confined to the ocellar triangle . . 0. fulviccps. 



Odontomyia atrovirens. 



Odontomyia atrovirens, Bigot, Ann. de la Soc. Ent. de France, 



5th serie, tome ix., page 214 (1879). 



$ . " Antennis basinigris (segmentum tertium?) ; facie tes- 

 taceo fulvo, utrinque albido villosa ; haustello uigro ; thorace 

 nigro cinereo et parce villoso, pleuris testaceis, albido villosis ; 

 scutello prasino. basi nigro, spinis testaceis ; abdomine prasino, 

 superne nigro nitido late vittato, vitta parum crenata ; halteri- 

 bus prasinis ; pedibus testaceis, femoribus anterioribus pallide 

 castaneis, retrorsum, apice fuscis, tibiis basi tarsique parum 

 infuscatis ; alis hyalinis, stigmate testaceo " (Bigot). 



