Seasonal abundance of Muscidae (Diptera) associated with cattle on a northern Transvaal farm.

Face flies were collected from cattle over a 14-mo period in an area where Parafilaria bovicola Tubangui was prevalent. Three species of Musca known to be vectors of P. bovicola were found. Two of the species (Musca lusoria Wiedeman and M. xanthomelas Wiedeman) were collected throughout the year, and M. nevilli Kleynhans was abundant only in autumn.