The immature stages of the Gnephia (Diptera, simulidae) of the Central Sierra Nevada mountains of California

The immature stages of six species of Cnepfaia were found by the author lin the streams of the central Sierra Nevada mountains. Of these only Qnephia mutata (Hallooh) and C, stewarti Coleman hare been reported previously from California* Cnephia jeaaae QeFoliart and Peterson is known from Utah and Wyoming, aid the remaining three species were undescribed. The larvae and pupae of the six species are described, and a key for their identification is provided. The adults of C. minus (Dyar and Shannon) and C. osborni (Stains and Know!ton) have been reported to occur in California but their immature stages are not known.