I!V A. I,. TONNOIIt. 



65 



scutelluni, this and post-scutellum obscurely fervufiinous. 

 Pleurae with exception of sternopleurae testaceous-orance, as 

 well as all the coxie; legs brownish, the femora slightly 

 lighter. Base of sten) of halteres testaceous, the rest and 

 the knob brown. Abdomen black, more or less shining, with 

 dark scarce pubescence; hypopygium ferruginous; wings grey 

 with a very indistinct smoky marking on fRs and r-m. 



Antennae tiliform as in preceding species; palpi alsO 

 similar. 



Venation : Origin of Rs in front of the end of Sc, f-m 

 placed after fRs; stem of Rs equal to stem of 1?,^ _, ;, 



Hypopygium: Side pieces with an internal pro-apical pi'o- 

 cess of moderate length and bifid at the end; claspers cylindri- 

 cal without any spines, hooks, or bristles, their ends blunt; 

 £edccagus complicated, presenting two downward pointing 

 processes '-' ending in a sharp black spine and presenting 

 a small tuft of hair at base of this spine, the internal parts 

 of the a-dcpagus in form of two strong hooks pointing up- 

 wards. • 



Wing length: 3 mm. 



Female: The colouring seems to agree well with that of 

 male as far as it is possible to judge from alcohol specimens; 

 there is agreement in all morphological details. 



Type and allotype from Mill, Allyn River, N.S.W., 18th 

 December, 1922. In the collection of the University, Sydney. 



Nineteen paratypes in spirit collected in the same locality 

 at the same date, by Mr. A. J. Nicholson, who found these 

 flies clusteretl on stones. 



D. HUMERALIS, n.^p. 



FlK. 5. Hypopygium of I), hiinnintl^ from Ixjlow ,^lul from tho si.lf. 



Male: Very similar to /;. tijchohoni, Inil its general 

 colouration very much darker. The thorax, which is rather 



CD. Tho hypiipyKium of Pixa us in most CuHcoulva is invorfrd, the 

 tprnuni l)oiii(r sit.UHteil veiiliHlIy. 



