6o DURHAM DIPTERA. 



VI. 82. 



76 (77). Claws in the female of unequal length. 



(576. fulvus, Mcq.) 



77 (76). Claws in both sexes of equal length. 



78 (82). Thorns present only on the fore femora. 



79 (80) (81). Eight thorns on the fore femora. Shining black. 



(571. flavipes, Mg.) 



80 (79) (81). Six to ten thorns on the fore femora. Blackish 



brown. Halteres yellow with black knobs. 



(573. brachialis, Hal.) 



81 (79) (80). Yellow species. Halteres cream white. Fore 



femora with 6-10 thorns. (574. distinctus, Hal.) 



82 (78). Thorns present on all the femora. Fore with up to 



seven, mid with one, hind with three. 



(572. spinipes, Mg.) 



83 (73). Claws with teeth. 



84 (87). The soles of the feet with thorns beneath. 



85 (86). Dorsum and abdomen shining black. 



(580. tibialis, Mg.) 



86 (85). Dorsum light grey with light brown stripes ; abdomen 



yellowish with dark brown bands; very large 

 species. 4-4^ mm. (581. fasciatus, Mg.) 



87 (84). Soles of the feet not thorned. 



88 (91). Dorsum black, or black and yellow. 



89 (90). All femora with three to four spines. . Thorax shining 



black. (577- serripes, Mg.) 



90 (89). Fore femora with many strong spines, mid with none, 



hind with one near the tip. Humeri and pleurae 

 yellow. (578- rufipectus, Winn.) 



91 (88). Dorsum grey with brown stripes. Fore femora many 



spined. Hind 3-4 spines. (579- lineatus, Mg.) 



92 (1). V.3. without any X-vein. 



93 (97). Femora not spined. 



94 (95) (96). Dorsum shining black. (585. venustus, Mg.) 



95 (94) (96). Dorsum chesnut. (582. rubiginosus, Winn.) 



96 (94) (95). Dorsum grey with brown stripes. 



(584. bicolor, Mg.) 



97 (93). All femora spined beneath, or at least some of them. 



