When examining closely workers of L. schwabi Ford and L. stuhlmanni Mayr, collected by Dr G. Arnold in Bulawayo and Chirinda Forest (S. Rhod.), and determined by him and comparing them with specimens of stuhlmanni, collected by Dr J. H. Grobler in Barberton (Tvl.), (also determined by Dr Arnold), I noticed that the ratio of the width of the head across the anterior margin to the width across the eyes is the same in both species.
Male, upperside: reddish-orange with metallic-blue area from base and black forewing markings of the general arrangement of those of P. thysbe (L.). Forewing: basal blue extends to roughly one quarter of distance along costa and to about half distance along inner margin, and with extensive iridescent colouring over the orange ground colour in the lower main portion of the wing. A small black spot beyond middle of cell, almost touching vein 6, a large spot at cell-end, a fairly small spot near costa in area 9 and an irregular transverse series of five moderately-sized spots, with a sixth rather ill-defined spot in area lb.
During a revision of the slide-collection of Siphonaptera at the South African Institute for Medical Research, special attention was directed to some questions not entirely solved by De Meillon, Davis and Hardy (1961) whose book is actually based on the specimens of this collection. The great difficulties these problems present rendered it impossible to attain completely satisfactory solutions. In some cases, however, it was thought worthwhile to give a more detailed account of the material and it is hoped that some remarks on this aspect will prove useful to other workers.
Herr Dr W. G. H. Coaton vom Plant Protection Research Institute, Pretoria, ï¿½bersandte mir zum Studium ein reichhaltiges Material termitophiler Phoriden; diese wurden zumeist von Herrn J. L. Sheasby in den Pilzgï¿½rten der betreffenden Termitennester erbeutet und sind, abgesehen von einigen Duplikaten, Eigentum des oben erwï¿½hnten Instituts. Sie erwiesen sich als zu verschiedenen Gattungen gehï¿½rig, wie weiter unten nï¿½her dargelegt ist.
Specimens of a very interesting species of Diapriidae have recently been received for identification from South Africa. They were submitted by Mr D. P. Annecke, Pretoria, who stated that they had been obtained from the fungus comb of Odontotermes latericius (Haviland) at two different localities a few miles from Pretoria. In all probability the species develops as a parasite of the termitoxeniid, Syntermitoxenia pseudonanna (Schmitz) (det. E. M. Beyer) which was present in both nests. I have been unable to place the diapriid as a descriptionbed species and have accordingly prepared the following descriptionption of it. A new generic name seems also to be required.
The present South African seed potato areas are dependent on a constant introduction of virus free seed potatoes from overseas to supply the potato industry with a sufficient amount of good quality seed potatoes. Despite the fact that virus free seed potatoes are planted, the quality of the seed potatoes produced has not everywhere been satisfactory even though the farmers make serious efforts to produce good seed. The object of this paper is to report on investigations aimed at finding areas suited for seed potato production, establishing why they are suited and why others are not, or are less so and at evaluating methods of producing tolerably good seed potatoes in less successful areas.
This paper contains a descriptionption of a new species of Elipsocus Hagen from Southern Rhodesia and further records of Elipsocus capensis Smithers; the localities given for E. capensis extend the known range of the species considerably, being the first records from Natal. This short paper is supplementary to that published previously (Smithers, 1962).
Millipedes are known for their damage to plants all over the world. They often attack sprouting seeds or roots, bulbs and tubers, and they are particularly fond of potatoes. They are an outdoor as well as indoor pest and occur very often in greenhouses in large numbers, where it is very difficult to eliminate them.
The nomenclatural status of the common long tailed mealy bug was first discussed by Cockerell in 1899, but it has never been satisfactorily settled (Ferris, 1950). After going through the references of the earlier authors, Cockerell pointed out: There is no such thing as Dactylopius adonidum Linnï¿½. In the early editions of the ""Fauna Suecica"" Linne had a Pediculus adonidum, but finding out that it was not a Pediculus, and apparently not knowing what to do with it, he omitted it altogether from the ""Systema Naturae"", ed. x, from which our nomenclature starts.
Recently the author was privileged to go on collecting trips to various parts of the Republic during which a number of interesting coccoids were found. Among the diaspidids collected are several new species and species imperfectly known from the original records. In the present paper a start is made on elucidating the identity of the latter as well as descriptionbing the new species discovered.
While the toxicities of a great many pesticides to insects of economic importance are well known, the effect of these materials on beneficial insect species has received little study. Attention has been drawn to this aspect, however, by the now familiar shortcomings of chemical control measures. The broader implications of imposing insecticides indiscriminately on insect populations include the elevation of some formerly innocuous insects to pest status. Resurgences of pest species at which control was aimed may also occur. Both these phenomena may be attributed to the virtual elimination of natural insect enemies from the environment by broad spectrum insecticides.
During a study of the ecology of the fauna in water filled rock pools in a granite outcrop in the Northern Guinea Savannah vegetation in Northern Nigeria (Keay, 1953), lepidopterous larvae were observed feeding on an aquatic plant growing in these pools. It was subsequently discovered that they represent a new species of Noctuidae, and a descriptionption of the species and an outline of its life history is presented here.
Until the recent discovery of material from Tanganyika, Southern Rhodesia and South Africa, the family Thyatiridae has been unknown in the Ethiopian Region though well known from the rest of the Old World, the Nearctic and from one Neotropical species of Thyatira Ochsenheimer, 1816 (see Forbes, 1936: 779-800). Thyatira achatina Weymer (1896:90) an African species which was at one time classified as a thyatirid (von Dalla Torre, 1921 :6) was shown to be a noctuid by Hampson (1910 :650) and designated as type-species of the genus Thyatirina. Three new African species are descriptionbed in this paper.