I would at the outset like to record my appreciation of the high honour I have enjoyed in being your President during the last year. It is an honour which I especially feel, for I regard myself far more as a Zoologist, who sometimes finds insects to be interesting arthropods, rather than as a true Entomologist. I lack that entomological single-mindedness which sees the rest of the animal kingdom, and the plant kingdom also, as little other than a stage upon which insects may express the ingenuities of their adaptiveness. Maybe as a zoologist I also lack that psychological tension which at times I recognise among my entomological friends.
The two most important aphid species on potatoes in South Africa are Macrosiphum euphorbiae (Thomas) (= solanifolii Ashmead), and Myzus persicae (Sulzer). Many authors report that they colonize a great number of host plants both in Southern Africa (Muller & Scholl, 1958; Bï¿½nzli & Bï¿½ttiker, 1959) and other parts of the world (Patch, 1938), On account of their importance as vectors of potato viruses these aphids, and especially M. persicae, have attracted considerable attention with respect to their population dynamics on potatoes and other host plants.
In a former publication (Daiber, 1962) observations on the population, dynamics of potato aphids in South Africa were reported. The colonization of potatoes by Myzus persicae (Sulzer), the most efficient vector of the leaf roll virus (Smith and Brierley, 1956), and by other potato aphids were descriptionbed as well as the spread of the leaf roll virus in the potato crops. The experiments were carried out with systemic insecticides to exclude any aphid population on the potatoes during the growing season. As a result of such sprays the leaf roll incidence in the crops from these treated fields was considerably lower than in untreated plots.
The cigarette beetle is distributed throughout the world and is known as a serious pest of tobacco and cocoa, particularly in tropical and sub-tropical areas (Howe, 1957). It is well known, however, that all grades of tobacco are not equally susceptible to attack, the high-grade, flue-cured tobaccos usually being most heavily attacked (Kurup, 1961; Runner, 1922; Yamamoto & Fraenkel, 1960).
The genus Acrophymus was erected by Uvarov in 1922 and he referred to it two species: Euryphymus squamipennis Brancsik, 1898, the type species of the genus, and Euryphymus sigmoidalis I. Bolivar, 1889. Miller in 1936 and 1949 added two new species. Uvarov in 1953 descriptionbed two more new species and transferred Caltopenus obesus I. Bolivar, 1889 to it. Johnston (1956) in his ""Catalogue of African Grasshoppers"" listed eight species of Acrophymus. Two more species are descriptionbed as new below.
A common red spider mite, hitherto popularly called the two-spotted mite, is a well-known pest of a variety of crops and plants in the Republic of South Africa (Ryke & Meyer, 1958). According to Meyer and Ryke (1959), Tetranychus bimaculatus Harvey was the name commonly used for this mite and this name was also accepted for the red spider occurring on deciduous fruit trees in the Western Cape (Georgala, 1955). The identity of this mite on deciduous fruit trees was confirmed by Dr A. E. Pritchard of the University of California, U.S.A. on samples sent to him (Georgala, 1954).
The Phytoseiidae are usually lightly sclerotized, relatively fast moving mites found in association with Tetranychidae, Tenuipalpidae, Eriophyidae and other phytophagous mites. They are predacious on the eggs, larval stages and adults of these injurious mites, some of which have become major pests in orchards all over the world.
This paper is based mainly on material from South Africa. Part was collected by the author in November-December 1961, another part was collected by B. R. and P. Stuckenberg, mainly in the Drakensberg Mountains and a number of interesting specimens, including one new species descriptionbed below, have been examined which were bred from their leaf-mines by Dr L. Vï¿½ri Some British Museum (Nat. Hist.) accession material has been studied and a few species from Kenya, Tanganyika and Ethiopia have also been considered.
The family Pyrgotidae includes three subfamilies, Pyrgotinae, Toxurinae and Lochmostyliinae, and only the first of these is recorded from Southern Africa by Van Bruggen (1961: 131-2) in his preliminary checklist. Recently a specimen of the interesting genus Ramuliseta Keiser was collected at Port St. Johns (C.P.); this is one of the four genera that constitute the subfamily Lochmostyliinae (Aczï¿½l, 1956: 27).
The small but extremely interesting family Lonchopteridae is composed of one genus, Lonchoptera Meigen, and about 20 species, for the entire world. There are three species of this genus recorded or descriptionbed from the Ethiopian Region. Two of these are known on material from Southern Rhodesia; an endemic species, L. africana Adams, 1905, was descriptionbed on a female collected by F. L. Snow near Salisbury in 1901. and a male of a very widely distributed species, L. furcata (Fallen), was recorded from Umtali by Malloch (1932). Another endemic species, L. acinaris (Sï¿½guy), was descriptionbed in 1938 on material from Kenya.
The name Diaspidiotus was first introduced in the coccid nomenclature in a paper published in 1896 under the joint names of Berlese and Leonardi. In this paper are descriptionbed two new genera, one new subgenus and five new species of Diaspididae, partly by Berlese, partly by Leonardi, and partly under the names of both authors. Diaspidiotus was proposed by Berlese as a subgenus of Aspidiotus and in it he descriptionbed one single species, Aspidiotus (Diaspidiotus) patavinus which stands as the type.
In preparing a ""Descriptive Catalogue of the Odonata of the Ethiopian Region"" (Pinhey, 1962), it appeared desirable to examine a few of the anomalous types housed in European Museums, and, with the help of the collection in the National Museum, Bulawayo, endeavour to seek the true relationship of some of these uncertain species. Eighteen species were selected but it was anticipated that there might be some reluctance to the loan of type material over the long postal network involved. However, the authorities concerned all proved only too willing to lend this material.
In working through myopsocid material collected in Africa the species mentioned below have been identified; in all cases these records increase our knowledge of the distribution of the species. Phlotodes angolensis Badonnel was originally descriptionbed from two males only; the present material contains both sexes.
Some time ago the junior author received among other Asilids a peculiar, unknown laphriine robber fly, accompanied by a bee of the genus Megachile Latreille, 1802, which it closely resembles. Dr G. van Son of the Transvaal Museum, who sent the specimen, urged the junior author to identify and descriptionbe it. When finally identification had proved impossible, the specimen was referred to the senior author, who held the opinion that it represented a new genus and species. After some hesitation in founding a new taxon on a single specimen, it was deemed sufficiently important not to wait for more material; thus the following descriptionption is presented.