Hutton. — On the Diptera brachycera of Nav Zealand. 63 



Key to the Genera. 



Proboscis short and stout, arista plumose. 



First posterior cell narrowly open, or closed. 



Fourth longitudinal sharply bent, nearly at a right 

 angle. 

 Thorax metallic . . . . . . . . Lucilia. 



Thorax not metallic . . . . . . Calliphora. 



Fourth longitudinal gradually curved. 



Middle tibiae with one or two bristles on the 



inner side .. .. .. .. Sepimentiun. 



Middle tibiae without bristles on the inner 



side . . . . . . . . Musca. 



First posterior cell widely open . . . . . . Mtiscina. 



Proboscis long and slender ; arista pectinated . . . . Stomoxys. 



Genus Lucilia, E. Desvoidy (1830). 



"Head depressed. Epistome not salient. Antennae 

 reaching the epistome ; the third joint four times as long 

 as the second ; arista plumose. Abdomen generally short, 

 rounded. Wings open ; first posterior cell reaching the border 

 a little in front of the apex; fourth longitudinal vein more or 

 less arched and concave after the bend " (Macquart). 



Lucilia csesar. 



Musca ccesar, Linnaeus, Syst. Nat., ii., 989 (1761). 



Bright bluish-green or golden-green. Head with silvery- 

 white tomentum ; vertex black, face reddish, epistome testa- 

 ceous ; palpi tawny ; antennae black. Legs black ; femora 

 bluish. Length, 5-9 mm. 



Hab. Throughout New Zealand. Introduced. 



The facial ridges are armed with bristles for one-third 

 of the length. This fly was not to be found in Auckland, 

 Wellington, or Dunedin in 1874. In 1872 I observed it 

 at Christchurch, but it had not arrived at Dunedin in 

 December, 1879. It is now common from W T hangarei to 

 Queenstown. 



Genus Calliphora, E. Desvoidy (1830). 



" Facial ridges bordered with hairs ; epistome a little pro- 

 jecting ; antennae nearly reaching the epistome, the third 

 joint four times as long as the second ; arista plumose. 

 Abdomen short. First posterior cell reaching the border of 

 the wing a little before the extremity ; fourth longitudinal 

 vein generally strongly arched after the bend" (Macquart). 



The eyes are contiguous or subcontiguous in the male. 

 The fourth longitudinal vein bends at a right angle to its 

 former direction. 



