114 DURHAM DIPTERA. 



XXIII. 191. 



27 (26). Stigma absent. Knees white. Anal thread in the 



male present. (iooo. filata, Ztt.) 



28 (21). Legs plumed. 



29 (30) (31). Female mid femora slightly ciliated on both sides; 



hind femora thickly plumed on both sides ; hind 

 tibiae slightly ciliated on the outer side. 



{fascipennis, Ztt.) 



30 (29) (31). Female hind femora thinly ciliated. Hind tibiae 



with long dark plumes on the outer side, and 

 shortly ciliated on the inner. (1004. costata, Ztt.) 



81 (29) (30). Male fore metatarsi thickened. Female hind 



femora plumed. (1003. tarsata, Mg.) 



82 (3). Legs yellow or orange, often with parts black. 



33 (36). Legs simple, male anus not thickened. 



34 (35). Thorax shining black. Proboscis very thin, as long 



as the head and breast. (1005. hybbtina, Ztt.) 



35 (34). Thorax grey. Proboscis about the length of the 



head, and thick. 

 1014. Ramfihomyia variabilis, Fin.? 

 Shull, 1 $ and 3 ?, Sept., 1900; Wearhead, 3 <?, 

 Aug., 1901. 



36 (83). Legs feathered in female. Male anus much thickened. 



37 (38). Antennae black and yellow. 



1012. Ramfthomyia pennata, Mcq. 

 Bishop Auckland, 1 ?, June, 1902. 



38 (37). Antennae all black. 



39 (40). Dorsum with four stripes. ( IOI 3« casta, Mg.) 



40 (39). Dorsum three with stripes. 



41 (42). Female mid femora slightly ciliated, hind femora and 



tibiae thickly plumed. Legs all black. 



(1009. plumipes, Fin.) 



42 (41). Female mid femora bare, hind femora and tibiae 



thickly plumed. Knees white. 



(1010. geniculata, Mg.) 



43 (2). Halteres dark. 



44 (47). Legs normal. 



