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I agree with John, and this is also true for Europe. I can add that Penthetria is more a species of wet earth along brooks and resembles the Cylindrotomatidae species Phalacrocera replicata in habitus. Bibio and Dilophus are (in general) species of dryer earth. You may identify the species using the key in Skartveit (2004) (see no. 17 in http://www.entomo...tabell.htm) or download directly http://www.entomo...ler_17.pdf. It is in the norwegian language, but nowadays you have good internet translators.