During 1961, Mr Alexander Matthew, South African Cooperative Citrus Exchange, Pretoria, visited the citrus-producing areas inland from Beira, Moï¿½ambique, and at Mazoe, Southern Rhodesia. His findings were brought together in a comprehensive unpublished report in which, among other things, it was noted that citrus red scale, Aonidiella aurantii (Maskell), although present in the areas visited as a pest in nurseries and young trees, appeared to be satisfactorily and commercially controlled by natural enemies in many orchards of mature, bearing trees.
There are two indigenous subspecies of Musca domestica L. present in the Ethiopian Region, and both occur in South Africa. The evidence for regarding them as subspecies has been presented (Paterson, 1956).
This communication presents results of studies on the systematics of dragonflies of Southern Africa. It contains descriptionptions of several new species and subspecies, and remarks on a few other species, where I have been able to supplement or correct the original descriptionptions. I have paid special attention to the genus Pseudagrion Selys, which contains the most species of all African genera. The work on this genus is, in part, a continuation of my previous study of the thoracic structures, as suitable characters for distinguishing the females in this genus (Balinsky, 1957).