DIPTERA: Empididae

Emergence traps were operated on Sixmile and Fourmile Creek for over a ten year period. The Fourmile Creek area included two sites one of which was below a sewage outfall. A list of the Empididae follows along with SEM photos taken by Tracy Jansen for her senior project at Penn State Erie, The Behrend College. Data for Fourmile Creek site 1 (above the sewage outfall) was collected from 1980-89 and Fourmile Creek site 2 (below the sewage outfall) was collected from 1981-89. The species list is from 1981-1984 for the Fourmile Cr. sites. The Fourmile site 1 was at 42°7’20”N;79°59’8”W and was located 550 m upstream at an elevation of 326m. The Fourmile site 2 was at 42°7’15”N;79°59’27”W at an elevation of 275m and was located 90 m downstream from a sewage effluent outfall. The facility was taken out of operation in November 1982. The Sixmile Creek collection site was located at 42°7’2”N; 79°57’14”W at an elevation of 360 m approximately 9 km south of Lake Erie. The species list is from the 1984 collections. Thanks are due Bradley J. Sinclair, Zoologisches Forschungsinstitut und Museum Alexander Koenig from Bonn, Germany for assistance with identification of specimens.