242 THE DirXERA-BRACHYCERA OF TASMANIA, 



faint; discal cell with normally two issuing veinlets, but 

 more rarely there is in addition a short, incomplete one, 

 leaving the cell above the other two. 



The flies comprised in this genus are small, delicate 

 insects, which may usually be found resting on vegeta- 

 tion. In Tasmania five species are known to occur, two 

 of which are identical with species described by Bezzi from 

 New South Wales. 



TaT)le of fJie 'fasnwnian Species of Leptopeza. 



1. Discal cell with a third short issuing veinlet ; 



thorax orange, with two black posterior spots; 

 abdomen black. Bimaculata, Bezzi. 



Discal ceil with only two issuing veinlets. 2 



2. Thorax orange, unspotted; a,bdomen black. 



RUBRITHORAX, Sp. nOV. 



Thorax black or grey. 3 



3. Legs yellow ; posterior femora banded with dark 



brown before the apex ; legs very bristly. 



PULCHERRTMA, BeZzi. 



Posterior femora not banded. 4 



4. Femora and tibiae entirely light yellovv-, without 



any sign of darkening; posterior femora with 

 only a few short apical bristles; costa of wings 

 not bristly; anal cross-vein distinct. 



Levicosta, Sp. nov. 



Legs yellow, but with the femora darkened above ; 

 posterior femora with numerous long bristles ; 

 costa of wings bristly ; anal cross^vein indistinct. 



Serraticosta, Sp. nov. 



Leptopeza_ bimaculata, Bezzi. 



Thorax orange, w^th two black, rounded posterior 

 spots ; abdomen brownish^black ; legs yellow, with the 

 knees narrowly black ; wings hyaline, with a brown 

 stigma; the discal cell with aii incomplete issuing vein- 

 let above the other two. 



Length. Male, 3 mm. 



Hab. Hobart. 



Male. Face black. Proboscis brown. Antennae black, 

 distinctly longer than the head, the; first and second joints 

 very short, the third narrow and lengthened, about four 

 times as long as the first two together, and terminated 

 by an arista which is about two-thirds its length. Thorax 

 orange, with two black, rounded, posterior spots ; scutel- 



