DURHAM DIPTERA. 55 



VI. 80. 



6 (5) (7). Wings only hairy at the point, and with a brown 



streak between X.4. and the tip. 



(520. culiciformis, L.) 



7 (5) (6). Wings slightly hairy, unspotted, except the X.4. dot. 



509. Tanypus choreics, Mg. 

 Hesleden, i $ , 21-8-00. 



8 (2). V.5. forks before X.5., which rests on V.5.a. 



9 (10). Wings bare, male fore tarsi thickly haired. 



(523. plumipes, Fries.) 



10 (9). Wings hairy, somewhat spotted. 



508. Tanypus nebulosus, Mg. 

 Bishop Auckland, 1 ? , 26-5-02 ; 1 $ , 1 $ , 

 28/29-9-02. 



11 (1). Pale species. 



12 (30). Wings spotted or banded. 



13 (27). Legs not many-ringed. 



14 (17). Wings spotted rather than banded. 



15 (16). Male with dark brown tufted hairs at the joints of the 



abdomen. Wings of the female much spotted. 

 507. Tanypus varius, F. 

 Hesleden, 1 $, 10-8-00; 1 $ , 29-4-01. 



16 (15). Male with whitish hairs on the abdomen, not brown, 



or tufted. Wing of the female not very much 

 spotted. (5 IQ - punctatus, F.) 



17 (14). Wings banded. 



18 (19). Wings with three bands. (516. trifascipennis, Ztt.) 



19 (18). Wings with two bands. 



20 (21). Thoracic side stripes dark yellow, edged with black 



in front. (515. ornatus, Mg.) 



21 (20). Thoracic stripes not edged. 



22 (23) (26). Thorax pale with grey stripes. 



(514. lenttginosus, Fries.) 



23 (22) (26). Thorax pale with red stripes. 



24 (25). Legs unicolorous. 



513. Tanypus carneus, F. 

 Bishop Auckland, 1 $, 15-5-97. 



