A new South African representative of the tribe Tanaonini (Apionidae) is descriptionbed: Afrotibicina stygia gen. and sp. nov. and an addition to Kissinger's key (1968) is provided. Some new data about biology of Tanaonini show that the tribe could be feeding on the archaic family Proteaceae.
A new genus, Leptosega, is descriptionbed for L gracilis sp. nov. from Zululand. A new species, Reidia capensis, is descriptionbed from Cape Province. Alieniscus arnoldi Benoit and A. rnatilloides Krombein are newly recorded from Botswana and Mozambique respectively, and the previously unknown male of the latter is descriptionbed.
Ten new species of Cerus are descriptionbed. These species are usually restricted to certain geographical regions, but some are sympatric. Two new species of Refrolix gen. nov. are descriptionbed. The biogeography of the species of the two genera is discussed.
Ophyra caperuis (Wiedemann) is a part of the fauna of manure accumulations in poultry houses. The larvae are facultative predators; they may be raised without prey on ordinary fly larval medium. Laboratory studies indicate that O. caperuis is an effective predator of house fly larvae. O. capellsis may be suitable for house fly control by inundative release.
A new species of Chalcididae, Hockeria gallicola, is descriptionbed from the central Namib desert in South West Africa. The new species is a pupal parasitoid of two gelechiid moths, Grandipalpa robusta Janse and Acutitornis sp., which are both gall-inciting species on the grasses Stipagrostis sabulicola and S. namaquensis.
The new species Leptoconops (Leptoconops) demeilloni is descriptionbed and illustrated from both sexes collected in the southern Cape Duneveld of South Africa. Short comparative notes are given on the remaining six known species of Afrotropical Leptoconops.
Investigations of a mosquito outbreak due to an irrigation overflow in the endemic malaria area of Natal, Republic of South Africa, showed the presence of five anopheline species, viz. Anopheles merus. A. quadriannulatus, A. pharoensis, A, squamosus and A. tenebrosus. Aspects of their behaviour and the implications of this research are discussed.
A new genus and species of spoon-wing lacewing, Knersvlaktia nigroptera, is descriptionbed from adults collected from the quartz plains near Van Rhynsdorp, Namaqualand. The combined presence of the following features distinguish this genus from the other 10 known nemopterine genera.
Alternative hypotheses concerning the origin of metamorphosis are contrasted. A model is proposed which postulates that insect metamorphosis is an effect of adaptations to differing sets of environmental selective pressures during ancestral amphibiotic life. It is postulated that amphibiotic life led directly to the selection of phase specific genes which control metamorphosis.
Observations on the nesting behaviour of a sphecid wasp, Ammophila dolichodera Kohl, showed that a single caterpillar prey was obtained and temporarily cached before excavation of the nest. A temporary nest seal was not employed.
Previous reports of directional calling in crickets are confirmed for two tree crickets (Oecanthinae) and one bush cricket (Eniopterinae). These species also turn periodically while calling, causing the call intensity to fluctuate at any fixed point. The physical basis of directional calling is summarized, and some effects of turning behaviour are discussed.