58 DURHAM DIPTERA. 



VI. 82. 



30 (31). Proboscis longer than in other species. 



(548. rostratus, Winn.) 



31 (30). Proboscis not lengthened. 



32 (33). Halteres entirely white. (549- bnmnipes, Winn.) 



33 (32). Halteres wholly or partly black, at least never quite 



white. 



34 (35). V.3. ending some distance before the tip of the 



wing. (546. frutetorum, Winn.) 



35 (34). V.3. ending rather near to the tip of the wing. 



36 (37). Legs brick-red, femora and tibiae with dark brown 



tips. (55°« fiavidus, Winn.) 



37 (36). Legs all brick-red, femora and tibiae not dark at the 



tips. (551. fuscus, Mg.) 



38 (25). Claws without footpads. 



39 (48). Wings with dark bands, marks, or spots. 



40 (47). Wings with grey bands, or grey with white bands or 



spots, but not with merely isolated dark spots. 



41 (42). Tip of the wing grey, without clear spots at the top. 



A clear band across the apical region and two 

 spots. (555- fascipennis, Staeg.) 



42 (41). Tip of the wing quite clear, or, with clear spots. 



43 (44). A clear spot beyond the end of V.3., which never 



extends to V.4., also a clear band over X.4. which 

 reaches V.5., and numerous clear spots. 



(556. pictipennis, Staeg.) 



44 (43). The clear spot beyond the end of V.3. is extended to 



form a band often reaching to the hind margin. 



45 (46). Wings with three grey bands. (554- varius, Winn.) 



46 (45). Wings with a brown bowshaped stripe and other 



markings. (557* arcuatus, Winn.) 



47 (40). Wings with numerous isolated grey or grey-brown 



spots. Three on the fore margin, the third being 

 double and characteristic. (558. pulicaris, L.) 



48 (39). Wings quite unmarked. 



49 (50). 0.3 2 indistinct on account of V.3. coalescing with the 



costa. (561- scutellatus, Mg.) 



50 (49). Both of the 0.3s distinct. 



