Several commissions of enquiry have been appointed to investigate and report on various aspects of our economic, socioï¿½economic, Bantu, pasture, animal husbandry, soil conservation, public health and other problems.As yet no commission has been appointed to enquire into the role played by insects in our agricultural, economic and social enterprises. The time has probably arrived for such a commission to be appointed and the initiative for its appointment and the aspects to be enquired into should be formulated by the Society.
This article is a summary of experimental results obtained by the author during the past two years with the abovementioned contact insecticides against Iridomyrmex humilis (Mayr) in vineyards at Stellenbosch and Paarl. Preliminary work done by the author (1953) in connection with the control of this ant species by means of barrier sprays showed promising results, and therefore this line of research was pursued. The result were very encouraging, as this article will show.
In the course of preparing an account of the anatomy of the nervous system of the prothorax of Acanthacris ruficornis (Fab.) certain points relating to the anatomy of the muscular system were observed which differed in detail from the majority of published descriptionptions of other acridids. In general the organisation of thc prothoracic muscles agrecs well with those of Dissosteira carolina L. as descriptionbed by Snodgrass (1929) and attention will only be directed to points of difference. The ennumeration of the muscles follows the scheme developed by Snodgrass as far as possible.
It has been realised that the Lepidochrysops patricia and numerous allied species must enter the nests of ants at a fairly early period in their larval life. Dr. S. H. Skaife discovered this in connection with Lepidochrysops in association with the ant Plagiolepis, on the sides of Table Mountain. On 4th November, 1954, when searching in an area at the northern end of the Berea, Durban on the inland side, a nest was found in which there were a number of pupae of the butterfly, the ant in question being a large brown species, Camponotus maculatus.
In their preliminary study of the Ethiopian Laelaptid mites parasitic on vertebrates, Zumpt & Patterson (1951), following Vitzthum (1943), designated the family Laelaptidae in a broad sense and listed ten subfamilies containing species parasitic on vertebrates. One of these subfamilies, the Rhinonyssinae, is composed exclusively of mites living in the respiratory passages of birds. In the present paper the subfamily status of this group will be retained, as we do not believe that there is sufficient justification for giving these mites the rank of family, as has been done recently by Baker & Wharton (1952) and other authors.
The width of the male frons is a variable feature in several genera of Calliphorinae. The character of a broad frons in genera or species which are normally more or less holoptic in the male sex is not restricted to or typical for high altitudes. It occurs under various ecological conditions and is probably due to genes which are manifested and selected in different ways but not by conditions which are only prevalent in high aititudes. Two new species are descriptionbed, namely Phumosia patersoni n. sp. from Pt. St. Johns, Cape Province, and Tricyclea par n. sp. from Martin's Drift, Bechuanaland.
It was found at Letaba that red scale (Aonidiella aurantii Mask.) was kept under adequate commercial control by its natural enemies in certain plots which adjoined some of the most heavily scale-infested plots. These ""natural control"" plots had not been treated with red scale insecticides for a number of years, and they only differed from the scaly plots with their pure or almost pure populations of either Pheidole megacephala F. or Anoplolepis custodiens Smith, in having mixed populations of several species of ants.