620 DIPTERA OF AUSTRALIA, 



^. — Length of antennse 037 inch ... 0*90 millimetres. 



Expanse of wings 0-170 x 0-042 ... 4-31x1-06 



Size of body 0-145x0-020 ... 3.66x0-50 



Dull brownish ochre-yellow. Palpi and antennae sometimes 

 brownish. Thorax opaque, sometimes with a very indistinct 

 narrow median brownish stripe ; two lateral longitudinal rows of 

 short brown hairs. Halteres with a somewhat infuscated club. 

 Abdomen dull, clothed with yellow hairs : superior segments more 

 or less tinged with brown, with a narrow pale border posteriorly. 

 Terminal joints of tarsi somewhat infuscated. Wings hyaline, 

 microscopically granulose ; veins ochreous-brown, the pubescence 

 very short. Auxiliary veins reaching costa at a point a little 

 before marginal cross- vein; discal cell open. 



Hah. — Generally distributed in N.S.W. (Masters and Skuse). 

 Almost throughout the year. 



Ohs. — The above -described answers in every particular to the 

 characters of the sub-genus Erioi^tera as defined by Baron Osten- 

 Sacken. It is the only Australian example as yet known to me. 



Genus 15. Trimicra, O.-Sacken. 



Trimicra, O.-Sacken, Proc. Ac. Nat. Sc. Philad. 1861, p. 290 ; 

 Mon. Dipt. N. Amer. lY. p. 165, pi. II. fig. i, 1869 ; Studies, II. 

 p. 195, 1887. 



" Two sub-marginal cells ; four posterior cells ; a discal cell ; 

 the second longitudinal vein originates at a more or less acute 

 angle before the middle of the length of the wing and a con- 

 siderable distance (more than the breadth of the wing) before 

 the tip of the auxiliary vein ; the sub-costal cross- vein is at a 

 considerable distance (three lengths of the great cross-vein, or 

 more) from the tip of the auxiliary vein ; seventh longitudinal 

 vein straight. Wings and their veins glabrous. Antennae 16- 

 jointed ; three last joints of the flag ellum abruptly smalle7\ Tibiae 

 without spurs at tip ; ungues small, smooth on the underside, 

 inserted under a projection of the last tarsal joint ; empodia small, 



