Confidence: It's likely to be this, but I can't be certain.
Notes: Vein m-cu separates Bibionidae from the Scatopsidae. The lack of rows of spines separates Bibio from Dilophus. However, the spines of the front tibia are needed for ID and are about the only feature not visible here. A few possibilities with long pale hairs, and partly reddish legs, but nothing definite.