Hutton. — On the Diptera brachycera of New Zealand. 3. 



Series ORTHORRHAPHA. 



Key to the New Zealand Families 

 Third joint of one antenna annulated. 

 Costa stopping at the tip of the wing 

 Costa continued all round the wing 

 Tbiid joint of the antennse simple. 

 Thorax and abdomen inflated 

 Thorax and abdomen not inflated. 

 Five posterior cells. 



Empodia styliform ; 



often closed 

 Empodia absent ; 

 always open 

 Four posterior cells 

 Three posterior cells. 



Second basal cell separated from the discal 

 Second basal cell united to discal 



fourth posterior cell 

 fourth posterior cell 



Stratiomyidce. 

 TabanidcB. 



Cyrtidce. 



Asilidce. 



Therevidce. 



Bombylidce. 



Empidce. 

 Dolichopodida \ 



Family STRATIOMYIDCE. 



"Three basal cells, much prolonged; veins of the mairr 

 trunks very crowded anteriorly ; both intercalary veins usually 

 existing ; costal vein reaching only to the middle of the wing. 

 Third joint of the antennas annulated, sometimes divided into 

 several portions. Tibiae without spurs ; empodia much de- 

 veloped, pulvilliform " (Loew). 



Key to the New Zealand Genera. 



Scut* Hum with four spines. 



An intercalary vein from the discal cell . . . . Exaireta. 



No intercalary vein from the discal cell . . . . Beris. 

 Scutellum with two spines. 



Posterior veins of the wing weak .. .. .. Odontomyia. 



Posterior veins of the wing strong .. .. .. Clitellaria. 



Scutellum without spines . . . . . . . . Cyclogaster. 



Sub-family Beridinee. 

 Abdomen showing seven segments. 



Genus Exaireta, Schiner (1867). 

 Antennae filiform, the flagellum with ten rings generally 

 indistinct near the end ; no style, but a few bristles on the 

 point. Eyes not contiguous in either sex. Scutellum with 

 four long spines. Abdomen flat, with seven segments. Third 

 longitudinal vein of the wing forked ; an intercalary vein fromi 

 the discal cell which sometimes does not reach the margin. 



Key to the Species. 



Thorax black 



Thorax bright bluish-green. 



Lengtb, 10 rum. 



Length, 4 mm. 

 Thorax dark reddish-brown or bronzy. 



Abdomen ferruginous, with a black tip 



Abdomen purplish, without a black tip . . 



E. spiniger. 



E. alpina. 

 E. opposita. 



E. apicalis. 

 E. straznitzkii* 



