The family Syrphidae comprises one of the few large families of flies which, viewed from an economic standpoint, are of great benefit to man. The larvae of a considerable number of species are aphidophagous, destroying countless numbers of plant lice and other injurious insects which suck the juices of plants. In many areas syrphid larvae are a principal natural control of aphids on truck crops and citrus. The adults commonly visit flowers for nectar and serve an important role in effecting crosspollenation of plants. Only a few species accidentally introduced into the United States from Europe are known to be harmful, feeding on bulbs of narcissus, amaryllis and onion, and none of these is known to occur in Florida. There are a few authenticated records of accidental parasitism in man, but these are of little significance. Certain species of syrphids have been used by scientists in the laboratory in the study of the physiology of insects, in genetics, and in cytology. Many are of value as scavengers, consuming decaying animal and vegetable matter which otherwise would be a nuisance to man. Adult flies present a remarkable diversity of size, form, and coloration, some resembling bees, wasps, and bumblebees so closely that they are frequently mistaken for the latter. Many species are brightly striped, banded, or otherwise colored with yellow, orange, green and blue, and range from relatively smooth, shiny species to several which are densely hairy. In some cases even the eyes are densely pubescent. The only check list of the Syrphidae of Florida was published in 1913 by C. W. Johnson and included 21 genera and 56 species, several of which were incorrectly determined. There has been relatively little work done in Florida on this interesting family of flies since that of Johnson. I began a study of the Syrphidae in 1945, and have collected a sufficient number of species to warrant publishing this list which includes 103 species, in 32 genera. Records are included from the U. S. National Museum, American Museum of Natural History, Academy of Natural Sciences of Philadelphia, Ohio State University Museum, Ohio State Archaeological and Historical Society Museum, Illinois
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