AN ACCOUNT OF BRITISH FLIES. 



dS One of the ungues longer than otlier in $ . 



Plantse hairy. 37. Fuhnis, Macq. 



yy Ungues with some spines on the inner side, of 



equal length. 

 c) Plantse hairy. 



38. Black, shiny. Anterior femora four spines, 



hind three. Serripes, Mg. 



39. Black, shiny. Anterior femora many spines, 



hind three. Rnfipedus, Wtz. 



40. Gray, blackish hairs. Anterior femora seven- 



teen spines, hind three. Lineatiis, Mg. 



c5 Plantre spinose. 



41. Black, shiny. Anterior femora ten spines, 



mid two, hind four. Tibialis, Mg. 



42. Blackish-gray. Anterior femora twenty-one 



to thirty spines, mid seven to twelve, hind 

 eight to sixteen. Fasciatiis, Mg. 



/3/3/3 Hind femora incrassated, spinose Ijeneath. No 



spines on ungues. One claw longer than others. Fcmoratits, F. 



43- 



AA. Wings with one cubital areolet, produced 

 from the praebrachial to the costa. 

 Wings bare. Subcostal united to costal 

 between middle of fore-border and tip 

 of wing. 



a Femora simple. 44. I'eiuistiis, Mg. 



aa Some or all the femora spinose on the under 



side. 

 /3 Ungues without spines. 



45. Palpi whitish. Halteres dark brown, white 



at base. Signatiis, Mg. 



46. Palpi yellowish-brown. Halteres white, knobs 



dark. Omatiis, Mg. 



/S/3 Ungues of + with spine on inner side. 



47. Halteres pale-yellowish. Fore femora with 



two spines at the middle. Tarsi dusky. 



Hind tibiae strongly ciliated. Taniatiis, Wlk. 



48. Halteres dusky, ferruginous. Fore femora 



with two spines between middle and end. 

 Tarsi pale yellowish. Hind tibije not 

 strongly ciliated. Calceatus, Hal. 



aa Antennie with the last three joints elongated. 49. Picttis, Mg. 



The following, described fully, are the most abundant British 

 species : 



i C. trichopterus^ Hoftm. 

 C biptmctafus, T^ = - C. geniculaftis, Guer. 

 \C. /lirt/iliis, Zett. 



Piceous. Head brown. Antenna brown ; plumes paler towards 

 the tips in the c^. Thorax hairy; hairs pale yellowish-white; pectus 

 pale in front, and with yellow streaks on each side, sometimes pass- 

 ing into almost a reddish tinge. Abdomen covered with gray hairs, 

 and having white sutures in the ^ \ ^ genitalia reddish - brown. 



