The present study attempts a survey of the distribution and taxonomy of the members of the common phytoseiid subgenus Typhlodromalus Muma occurring on plants in South Africa. The authors hope that this may furnish a basis for subsequent research work on the ecology and possible utilization of these mites in the biological control of phytophagous Acarina.
It has been stated that Belostomatidae are often attracted to light (e.g. Imms, 1957: 466; Miller, 1956: 139) hut there appear to be very few numerical records of the occurrence of species of Belostomatidae at light. Southwood (1960a: 115) does not record any Belostomatidae from a light trap run at Tafo, Ghana, and the same author (1960b: 199) records only one specimen of his family from a trap run at Kawanda Research Station, Uganda.
Neomyobia africanoides spec. nov. figs. 1-3 This new mite, discovered on the Peak-saddle Horseshoe Bat (Rhinolophus blasii Peters), is very similar to Neomyobia africana Lawrence (1951), but differs from it in the female by lacking the pair of pores on the hind part of the venter, by slight differences in the length of several dorsal spines and setae, and in the male mainly by the shape of the penis.
In a former publication (Daiber, 1962) a report was given on aphid populations on potatoes, winged dispersal of potato aphids, and on the leaf roll spread at Rietvlei Experiment Station. Though Macrosiphum euphorbiae (Thomas) (= solanifolii Ashmead) was more abundant than Myzus persicae (Sulzer), the latter is regarded as more important for the spread of the leaf roll virus (Smith and Brierley, 1956). In our experiments leaf roll spread early in the season was more important than later in the season, and spread within the crop by unwinged M. persicae was more important than spread into the crop by winged forms.
Most of the following notes are records of Odonata in Central Africa, and particularly Rhodesia. Certain additions to the collection of the National Museum in Bulawayo are from tropical Africa and Madagascar. The descriptionption of the nymphal chuck of one Rhodesian species is also included.
The flowers of the proteas are in many-flowered, usually solitary, heads enclosed in an involucre of numerous imbricate bracts. The protea plants are shrubs or trees, each of which may be regarded as a separate ecological mesostand composed of several microstands. The entire protea community, consisting of many plants, constitutes a macrostand. Each microstand, the protea heads, harbours an animal microassociation which - especially in the tree forms recur frequently, but because of their relatively small size, the total area covered by the different minor stands is small.
New forms of this order of Arachnida are not frequently met with since the group has now been fairly intensively studied in South Africa. I am therefore all the more indebted to the following collectors who have made these specimens available to me for study. From Mr F. Gaerdes of Okahandja. S. W. Africa, I have received a new subspecies of Biton; from Dr R. van Pletzen of the University of Orange Free State, Bloemfontein, a new species of Solpuguna; Mr D. Broadley of the Umtali Museum, Southern Rhodesia sent me a new species of Solpuga and finally Dr Uys de Villiers Pienaar, Biologist to the Kruger National Park, collected a new form of Solpugema.
Fruit flies in deciduous fruit orchards in the Western Cape Province, are controlled by the application of either bait-sprays or cover-sprays directed against the adult insects. Therefore, precise knowledge of the whereabouts and movements of fruit flies is a primary requirement for implementation of the methods of control.
The species dealt with in this paper comprise a poorly known group of parasites of soft scale insects. Three of the new species are recorded as parasites of economically important scale insects. Types of the new species are in the National Collection of Insects, Plant Protection Research Institute, Pretoria.
Although much attention has been paid to the musculature of the pterothorax of the Acrididae and especially to the modifications which it shows in brachypterous and apterous forms, no study has been made of the pterothorax of the Pneumoridae, although this group is considered, on the basis of its wing venation (Ragge, 1955), to be the most primitive of living Orthoptera.
Relatively little seems to have been published concerning the biology of African wasps of the family Sphegidae, especially those otherwise commonly known as the ""Crabros"". Arnold (1926: 358) and Skaife (1954: 337ï¿½8) provide brief notes on various species, under the generic names of Thyreopus Lepeletier and Brullï¿½ and Dasyproctus Lepeletier and Brullï¿½ respectively.