Bibionidae March Flies

of the United States, mainly during May and September. Larvae are found in aggregations under moist, decaying materials, including leaves, grass clippings, Spanish moss, and manure. They are most often seen as copulating pairs and may remain in copula for several days, even while feeding together on flowers. When locally abundant, flying pairs can pose a hazard to automobile travelers by obscuring vision, clogging radiators, and occasionally damaging automobile finishes. Large flights occur in the United States along the Gulf Coast of Florida westward to Louisiana and eastern Texas and southward to Central America (Denmark and Mead, 1992). P. nearctica also occurs in large numbers along the Atlantic Coast of Georgia and southern South Carolina Taxonomic keys for the larvae and adults of the six North American bibionid genera are provided in Hardy (1981). Denmark and Mead (1992) provide keys and review the biology and ecology of Nearctic Plecia.

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