282 DURHAM DIPTERA. 



XXXIII. 474. 



61 (60). At least the halteres brownish yellow. 



62 (63). Last abdominal segment on the under side with two 



small black shining knobs ; matt-black species. 



(2153. parva, Stein) 



63 (62). Last abdominal segment without these knobs ; 



abdomen lead coloured, somewhat shining. 

 2154. Homalomyia sere7ia, Fin. 

 Bishop Auckland, 3 $ and 1 ?, May, 1900-02. 



64 (53). The under scale of the squamae distinctly protruding. 



65 (70). Mid tibiae front outer side with at least two bristles. 



66 (67). Body blue-black, distinctly shining. 



(2155. corvina, Verr.) 



67 (66). Body otherwise coloured. 



68 (69). Mid tibiae front outer side with at least three bristles ; 



palpi prominent. (2156. polychata, Stein) 



69 (68). Mid tibiae front outer side with only two bristles ; 



palpi very small. (??ii7iutipalpis, Stein) 



70 (65). Mid tibiae front outer side with only one bristle. 



71 (80). The whole inner side of the mid tibiae covered with 



very short, but thick and even pubescence. 



72 (73). Genitalia remarkably large and strong. 



(2157. glaucescens, Ztt.) 



73 (72). Genitalia of the usual shape. 



74 (75). Hind tibiae somewhat remarkably bristled, in addition 



to the usual bristles; abdomen with central line 

 and distinct cross bands. (2158. incisurata, Ztt.) 



75 (74). Hind tibiae with only the usual bristles ; abdominal 



segments without, or with very indistinct bands. 



76 (77). Palpi much broadened in front, almost spoon-shaped, 



nearly the whole hind underside of the hind femora 

 with a row of long hairs. {latipalpis, Stein) 



77 (76). Palpi not enlarged ; hind femora at the above place 



short haired, and only long haired near the tip. 



78 (79). The row of bristles on the hind underside of the mid 



femora composed of comparatively few bristles ; 

 pubescence on the inner side of the mid tibiae 

 exceedingly short. canicularis, L. (2143 above) 



