796 DIPTERA OF AUSTRALIA, 



cross-vein, but in L. hrevivena it joins the costa about a similar 

 distance before the origin ; this is on account of the difference in 

 the length and character of the prgefurca, which in the first- 

 named species originates at an acute angle about the middle of the 

 length of the wing, but in a rounded angle considerably beyond 

 the middle in hrevivena. Marginal cross-vein wanting. Second 

 longitudinal vein gently bending upwards to the margin ; third 

 longitudinal vein arcuated downwards, reaching the margin close 

 to the tip of the anterior branch of the fourth longitudinal; so 

 that the sub-marginal cell is enormously widened, and the first 

 posterior cell extremely narrowed, at the wing-margin. 



The sub-marginal cell is very little longer than the first posterior ; 

 the small or anterior cross- vein is arcuated and unusually long, 

 being quite the length of the great cross-vein ; consequently the 

 inner end of the discal cell is very short, which causes the cell to 

 be almost triangular ; great cross- vein at, or a little before, the 

 inner end of the discal cell ; fifth and sixth longitudinal veins 

 nearly straight ; the seventh very slightly arcuated. 



This genus appears to be somewhat related to Antocha, O.-Sack., 

 on the one hand, and Artarha, O.-Sack., on the other; to the 

 former in wanting the cross-vein, to the latter by the extremely 

 microscopic pubescence of the wings, but in other particulars it 

 seems to entirely diifer. TJnfoi'tunately, not having a single male 

 specimen, I cannot describe the holding-forceps. Both the following 

 described have their pleurse conspicuously striped with yellow and 

 brown. 



318. Leiponeura gracilis, sp.n. (PI. xxi., fig. 11). 



9. — Length of antennae 0-047 inch ... 1-18 millimetres. 



Expanse of wings 0-240 x 0-050 ... 6-09x1-27 



Size of body 0-210x0-025 ... 5-33x0-62 



Head, including rostrum, palpi and antennae, black, the front 

 with a hoary bloom ; sometimes the face and rostrum yellow. 

 Thorax brown, opaque, with two small yellow spots behind the 



