Most remarkable, in many respects, of all aquatic larvae are the grubs of the Sand-midges (Simulium).
In Spartanburg County attacks by Simulium seems to be confined to the immediate vicinity of the breeding-places.
Most of the other species of Simulium which have been studied seem to be single brooded.
At Nueltin Lake the Simulium hordes become troublesome at approximately the same time as the mosquitoes.
The pupae of Simulium rest in their curious little cup-like dwellings, attached to submerged stones or plants.
