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Immatures of Simulium of the Kings River.
Six species of Simulium larvae found in the Kings River near Piedra, Fresno County, California, are described. The black fly larvae and pupae were reared in the laboratory for taxonomic association of the immature instars, the pupae and the adults. The differential morphology of S. argus Williston, S . aureum Fries, S. canadense Hearle, S. virgatum Coquillett, and S. vittatum Zetterstedt is presented in greater detail than ever before, with the S. arcticum Malloch larva being described for the first time.