Two new species of Chrysopidae, Brinckochrysa tjederi and B.pulchella, are descriptionbed from the Transvaal, South Africa. The new taxa are compared with other African species of the genus; three new synonyms are established.
Sound pressure levels (SPLs) of the songs of seven species of cicada were measured. Variation within and between individuals and species was examined. Some theoretical physical and physiological effects of body size on song intensity are pointed out.
A total of 30 species of dung beetles was recorded in indigenous shrubland near Langebaan and a pasture of Kikuyu grass near Paarl over a period of 13 months. These species were divided into 2 groups according to their distribution between the rainfall regions of southern Africa. The potential of these beetles as control agents of the dung-breeding bush fly in south-western Australia is discussed.
Medisores abditus, a new genus and species of Rhysodini from Ntsubane, S. Africa is descriptionbed and figured. It is placed in a new subtribe, Medisorina. A key to the subtribes of Rhysodini is provided.
Differences in resistance to the larvae of B. fusca feeding in whorl tissue have been identified in certain maize genotypes, but there are no data on the effectiveness of this resistance in reducing yield loss. To determine whether first feeding in the whorl of different maize genotypes yield loss, II homozygous maize cultivars (inbred lines) were each artificially infested with approximately 20 first instar larvae. It is concluded that field selection for resistance to B. fusca should rely on leaf damage recorded after 24 days feeding and visual assessment at harvest of plant height reduction and yield.
Bothamia demeilloni gen. et. spec. nov., taken in the protected indigenous forest of Ngome, northern Natal, is descriptionbed and illustrated. It is compared with, and differentiated from, the closely related genus Fanthamia. A summary of climatic data and a brief descriptionptive introduction to the Ngome forest is given as a basis for future descriptionptions of Ceratopogonidae from this area.
The African genus Zulubius Bergroth and the species, Zulubius maculatus (Thunberg), are redescriptionbed. Zulubius acaciaphagus is descriptionbed as new. Both species, including the genitalia, are illustrated.
The development of the eggs in Culex theileri Theobald females exposed to various constant temperatures between 12ï¿½C and 36ï¿½C was examined. Development took place only between 12ï¿½C and 33ï¿½C. The developmental zero was 9ï¿½C. A basis was set for the prediction of the developmental rate of C. theileri eggs exposed to a given constant temperature. Maximum oviposition took place at 24ï¿½C.
Three new species of the subgenus Sergentomyia are descriptionbed viz. S. caliginosa, S. formica, and S. rima. Keys to males and females of the seven known species occurring in Zambia, Zimbabwe, Malawi, Namibia and South Africa, are given.
Two new species of the subgenus Sergentomyia are descriptionbed, viz. S. ashfordi and S. magnidentata from Ethiopia and Kenya respectively. Keys to males and females of the known species occurring in East Africa are given.
Brachagenius oculatus sp. nov. is descriptionbed and compared in a key to other members of the genus. Xiphoscelidus Peringuey is synonymized with Brachagenius, resulting in Brackagenius lugubris (Peringuey) comb.nov. Brackagenius lineatipennis Kraatz, formerly considered as a synonym of B. pictipennis Kraatz, is a synonym of Elpidus hopei (Burmeister). Both genera are briefly diagnosed and each species is figured.
The genus Oedanomerus Waterhouse is revised. Five species are currently recognized within the genus, including two species descriptionbed as new: O. capriviensis and O. bicolor. An illustrated key to all the known species is presented.
Scapanoclypeus gen. nov. is descriptionbed and compared in a key to a Oedanomerus Waterhouse and Trichinopus Waterhouse. Trichinopus aberrans Frey is designated as its type-species, resulting in the new combination of S. aberrans (Frey). Five additional species are descriptionbed as new. An illustrated key to the known species of the genus is presented.