822 DIPTERA OF AUSTRALIA, 



long, semi-erect blackish hairs ; in 9 with inconspicuous decumbent 

 hairs ; femora with a broad ring of brown or blackish immediately 

 before tip ; tibiae brown or blackish at tip ; tarsi deep brown or 

 black. Wings slightly tinged with brownish ; veins brown or 

 blackish ; tip of first longitudinal vein, the marginal cross-vein, 

 prsefurca, bases of sub-marginal cells, and fifth longitudinal vein 

 often distinctly infuscated ; stigma pale brownish. Auxiliary vein 

 reaching costa before, opposite, or beyond marginal cross- vein ; 

 marginal cross-vein a little beyond inner end of first sub-marginal 

 cell ; discal cell often with a short stump of a vein from lower 

 basal angle of second posterior cell ; great cross- vein situated a 

 little before inner end of discal cell. 



Hah. — Swan River, W. Australia (Walker) ; Adelaide S. 

 Australia (J. G. O. Tepper), Coll. S. Aust. Muaeum', Sydney, &c., 

 N.S.W. (Masters and Skuse). Extremely abundant during 

 August, September, and October. 



Ohs. — Schiner's T. Sydneyensis is certainly the female of 

 Walker's species. Some specimens before me are larger than the 

 above measurements, others are less than two-thirds the size. I 

 can see very little other variation apart from sexual differences.. 

 More than one hundred specimens before me for comparison. 



342. Trimicra microcephala, Thomson, 



Limnohia microcejohala, Thomson, "Eugenia" Exp. Dipt. p. 446, 

 1868. 



(J. — Length of antennae '05 5 inch ... 1-39 millimetres. 



Expanse of wings 0-250 x 0-060 ... 6-34x1-54 



Sizeof body 0-180x0025 ... 4-56x0-62 



9, — Length of antennae 0-050 inch ... 1-27 millimetres. 



■ Expanse of wings 0-250x0-060 ... 6-34x1-54 



Sizeof body 0-220x0-025 ... 5-58x0-62 



Remarkably like the preceding in colouring and markings, but 

 smaller. Legs of both sexes inconspicuously clothed with short 



