84 DURHAM DIPTERA. 



XIII. 135. 



9 (8). Dorsal stripes moderately broad with dark edges and 

 centre line. 



10 (13). Wings distinctly marmorated in brownish and white. 



Dorsal stripes grey. 



11 (12). First antennal joint dark grey, at least at the base. 



809. Tipula truncorum, Mg. 

 Bishop Auckland, 1 $, 8-6-01. 

 I am not sure if this is correct. The thoracic stripes 

 are peculiar. 



12 (11). Antennal joints all yellow. Pale wing spots smaller. 



(810. winnertzii, Fgg.) 



13 (10). Wings almost all brownish, but at least a pale spot 



in 0.5 1 . Dorsal stripes brown. 



(812. pabulina, Mg.) 



14 (7). Dorsum with four brown or grey stripes, often brown 



edged. 



15 (22). Dorsal stripes very little darker than the ground 



colour, but always dark edged. 

 16(17). Pleurae with a sharp-edged dark longitudinal stripe. 



(807. rufina, Mg.) 



17 (16). No pleural stripe. 



18 (19). Inner edges of middle dorsal stripes so near together 



that they almost make one broad centre brown 

 stripe. Joints of the flagellum, in the male, deeply 

 cut out beneath. (817. excisa, Schum.) 



19 (18). Centre dorsal stripes at least divided at some point. 



Flagellar joints not incised. 



20 (21). Central dorsal stripes touching in front and behind. 



816. Tipda scripta, Mg. 

 Wearhead, 1 $, 26-8-01 ; Harperley, 1 $, 28-6-02. 



21 (20). Central dorsal stripes, at most, touching only in front. 



(815. ?iubeculosa, Mg.) 



22 (15). Dorsal stripes darker than the ground colour, but 



without dark edges, central pair narrowed behind 

 and approximated. 



