In einer Hispinen-Sendung des Transvaal Museums in Pretoria fanden sich die hier behandelten Arten. Es ist keine Neuheit darunter. Die Haupt-aufgabe dieser Arbeit besteht darin, einen Beitrag zur Hispinen-Fauna Sï¿½dafrikas zu liefern.
Since contact insecticides are nowadays generally made available in dust as well as in spray form, the consumer has the choice between two methods of insect control. His choice may be largely influenced by economic considerations, especially when large quantities of insecticides are likely to be used very frequently, as is generally true for the control of locust outbreaks in many parts of the world. Important considerations are relative potency, cost, bulkiness and ease of application. The main object of the present study was to assess the relative potency of BHC dusts and sprays against hoppers of the brown locust, Locustana pardalina (Walk.)
This, and the papers to follow, embody the results from collections made by my husband and myself in Nyasaland and Southern Rhodesia, August-December 1948, in the course of an expedition under the auspices of Rhodes University. In all the collections a high proportion of the catch was taken as indiscriminately as possible, so that the number of specimens recorded probably yields an approximation to the relative proportions of species actually present in the different habitats and parts of their range. In the account which follows the localities are listed under the separate categories: bog, swamps, streams and ponds. From the number of specimens collected from each habitat it is then possible to infer which type of environment any particular species prefers.
K. durbanensis is widely spread in Africa and proves to be a suitable subject for laboratory investigation. Methods are descriptionbed for rearing this species in different types of artificial nests. In the natural state it is found in dead branches of several indigenous bushes and trees, and it will also attack dead wood of citrus, vines, conifers and other exotics. It will eat paper and shows a preference for newsprint made from coniferous wood pulp. Sawdust fixed with 3 % agar is accepted and it prefers sawdust from partially decayed wood when offered a choice.
Zonothrips smutsi spec. nov. (Figs. 1-6) Female (macropterous) Length (distended) about 1.1-1.3 mm. Colour as seen in the series of specimens from Potgietersrust, which were collected into 10 % alcohol plus 0.1 % Triton emulsifier, and mounted within two weeks in Canada balsam: brown to blackish brown and prominently banded with yellow; head brown dorsally, laterally, and ventrally, sometimes somewhat paler brown ventrally behind the eyes; eyes so deep red as to appear black; ocellar crescents not differentiated in most specimens, deep red in those which have retained some of the orange-red internal pigmentation;
The South African Thysanoptera are still largely unknown, although Dr. J. C. Faure, Mr. C. F. Jacot-Guillarmod and Dr. E. K. Hartwig have studied this order for many years and have published a number of contributions on its taxonomy. The thrips material in the Collection of Insects in the Department of Agriculture is already very extensive, and contains many undescriptionbed species. In this paper two new species of the genus Chirothrips Haliday, which have been collected on grass, are descriptionbed. I am greatly indebted to Dr. J. C. Faure, in whose laboratory I am working, for placing material at my disposal and for guidance in the preparation of this paper.
Malloch (1923) demonstrated that the genus Orthellia R.-D. could be separated from Pyrellia R.-D. and other genera of metallic Muscini by the presence of a tuft of black setulae on the posterior part of the suprasquamal ridge (parasquamal tuft). Since then most authors have followed Malloch in defining the genus. Curran (1935) in his study of the Ethiopian species of Orthellia drew attention to the fact that, in all species but two, the infra-alar bulla was haired. He suggested that it might be better to remove the exceptions, prima Curran and distincta Villeneuve (= gemma Bigot), from Orthellia. Karl (1935) used the character of a haired infra-alar bulla to define the genus Orthellia but probably did not know that apparent exceptions existed.
Pterodectes delicatulus n.sp. This species is based on 16 male male, 8 female female and 8 nymphs from the grey-headed sparrow, Passer grisea (Vieill.), Marinqua, Mozambique, leg. W. Bï¿½ttiker, 23.VI.50. A further 5 male, 3 female and 13 N were collected from the same host near the junction of the Sabi and Lundi Rivers, S. Rhodesia, leg W. Bï¿½ttiker, 4.VI.50.
On two visits to the Kalahari Gemsbok Reserve in 1956 and 1957, arranged by the National Parks Board, as well as on other journeys to arid areas, I noticed that some very black tenebrionid beetles were active even in the hottest part of the day when the sand was so hot that it was most uncomfortable for me to walk about barefooted. In a comparatively cool period in February 1957, the surface soil temperature was 57ï¿½C., while the air temperature at 12 cm. above the ground was 46ï¿½C. These observations drew my attention to the question of how these insects are able to tolerate such high temperatures.
During the end of October and the beginning of November, 1955, wheat in a very advanced stage on the farms Merwede and Vlakpan in the Bethlehem district was infested with aphids. It so happened that some of the wheat fields on Merwede were sprayed with 2,4D airspray mixture at the tillering stage and it is only natural that the damage done by the aphids was generally believed to be due to the weedicide.
When investigating a nest of the ant Camponotus imaculata Fab. on the slopes of Table Mountain, some distance above the contour road, on 18th December, 1956, a pupa of Lepidochrysops trimeni (B.-Bak.) was found 2ï¿½"" below the level of the ground, suspended from a small dead leaf in the roof of the gallery under a small rock. Some silk which had been spun over the end of the leaf provided support for the cremastoral hooks of the pupa. The nest was 3' from a bush of Selaga serrata Berg. (Selagineae) , the food-plant of the larva in its earlier instars. It contained a large number of ants and their immature stages.