298 DURHAM DIPTERA. 



XXXIV. 485. 



18 (17). Large grey dusted species, with the little acrostichal 



bristles long; third antennal joint with a sharp 

 upper corner ; arista very shortly plumose ; 

 abdomen with long black erect hairs. 



(probosa'dea, Ztt.) 



19 (14). Tibiae only partly black. 



20 (21). Thorax distinctly dusted ; frons red-brown ; femora 



black, except at the tip ; fore and mid tibiae orange ; 

 hind tibiae dark brown ; tarsi orange ; wings at the 

 base and at the fore margin somewhat browned. 



(2197. rufimana, Mg.) 



21 (20). Thorax only slightly dusted; frons black, scarcely 



red over the antennae ; femora black, only the base 

 and tip of the tibiae orange; tarsi reddish brown; 

 lamellae of the male strongly bristly ; wings at the 

 base and fore margin distinctly brown. 



(aberrans, Beck.) 



22 (1). Two scutellar bristles. 



23 (26). Species with the thorax and abdomen entirely black. 



24 (25). Tip of the wing in the male distinctly clouded. The 



under side of the hind femora with fine long black 

 ciliation, tibiae and tarsi entirely orange. 



(2200. umbrosa, Lw.) 



25 (24). Tip of the wing not clouded ; hind femora without 



long ciliation; tibiae black, base and tip red-brown; 

 tarsi black, the last joint red-brown. 



(2201. biseta, Lw.) 



26 (23). The whole body shining yellow with clear yellow 



wings. (um'color, Lw., $) 



486. Parallelomma, Beck. 



1 (6). Arista long haired to the middle. 



2 (3) (4) (5). Thorax yellow below, black above, occasionally 



the pleurae blackish ; abdomen black, somewhat 

 grey-dusted ; hypopygium yellow ; lamellae yellow 

 with black tips, or all black. {dispar, Ztt, $) 



