878 DIPTERA OP AUSTRALIA, 



its length distant from tip of first longitudinal vein and consider- 

 ably before middle of anterior branch of second longitudinal vein ; 

 prsefurca moderately long, obtusely arcuated or angulated at its 

 origin ; petiole of first sub-marginal cell short, usually longer than 

 marginal cross-vein ; anterior branch of second longitudinal vein 

 almost angulated at its base, and bending gently upwards to 

 costa ; small cross-vein extremely short or obsolete, so that the 

 discalcellis in contact with second sub-marginal, and forms rather 

 more than a right angle ; discal cell nearly twice as long as wide, 

 the great cross-vein near its inner end ; sixth longitudinal vein 

 slightly and seventh distinctly sinuated. 



Hah. — Upper Hunter, N.S.W. (Masters). Seven specimens. 



Obs. — Easily distinguished from all other species by its spotless 

 wings. A very distinct species, evidently most allied to the 

 last, G. himaculata. 



376. Gynoplistia viridis, Westwood. (PI. xxiii. fig. 39). 



Gynoplistia viridis^ Westw., Lond. and Edin. Phil. Mag. 

 1835 (?); Macquart, Dipt. Exot. I. p. 44, pi. 3, f. 1, 1838; 

 Ccenarthria viridis, Thomson, Dipt. 'Eugenia' Exp. p. 446, pi. 9, 

 f. 1, 1868. 



$. — Length of antennae. 0*100 inch ... 2 54 millimetres. 



Expanse of wings 0-250 x 0-070 ... 6-34x1-77 



Size of body 0-270x0-050 ... 6-85x1-27 



Head aeneous-green, nitidous. Rostrum, palpi, and antennae 

 brown, the latter 16-jointed ; joints of scapus sometimes obscure 

 testaceous; first 10 flagellar joints with a simple branch, the last 

 three branches diminishing in length ; eleventh usually with a 

 slight projection, sometimes also twelfth, more rarely the eleventh 

 with even a short branch ; first two branches directed outwards ; 

 terminal joints elliptical, about equal in length. Thorax aeneous- 

 green, slightly chalybeous anteriorly, nitidous ; pleurae griseo- 

 pruinose. Halteres fulvous-yellow. Abdomen reddish-ochraceous, 



