In this report seven series of termites from the Belgian Congo are specifically determined, one Glyptotermes and two Neotermes species being descriptionbed as new. A descriptionption is given of four series referred to species already named, the synonymy and recorded distribution being reviewed in each case.
F. van Emden (1951), in his important study of the genus Limnophora R.--D. in the Ethiopian Region, illustrates the male genitalia of two specimens both of which he refers to L. translucida Stein, 1913. The specimen from East Africa is almost certainly the form descriptionbed by Stein since van Emden's illustration agrees well with the genitalia of a male which I have seen from Moshi, Tanganyika, the type locality of translucida. The other specimen illustrated was from Mt. Cherinda, S. Rhodesia. I have found both forms at several localities in South Africa and it has become clear that they represent two different species with rather marked differences in their habitat preferences.
Owing to many earlier difficulties in change in nomenclature, synonymy and mis-identifications, the published distribution records are mostly quoted from Edwards (1941) and later authors. The distribution is given, with notes on taxonomy and bionomics, of 105 culicine species and one of the genus Toxorhynchites, which occur in South Africa and the neighbouring territory, of South West Africa and the Protectorates of Bechuanaland, Swaziland and Basutoland. The culicine species comprise ten genera and seventeen sub-genera.
In the course of investigating the effectiveness of these insecticides against the Argentine ant in vineyards the following treatments were carried out. On 14.4.53 each of the insecticides was applied broadcast to the soil of different field plots at Stellenbosch. Two years later field observations indicated that the treated soils remained toxic to the pest. The laboratory experiments reported here, were designed with the object of gaining more information about the relative degree of toxicity of the different soils.
The results of a Culicine mosquito survey of the upper Limpopo River Valley are given in three tables, with a map to show the collecting points. Three vectors of yellow fever were encountered. The more important breeding places are discussed. Treeï¿½hole breeders, of which six species were found, apparently have the greatest breeding potential in this area. This mosquito survey forms part of a programme being carried out which will eventually cover the whole of the Union of South Africa in order to show the distribution of the culicine mosquito species to be found on the sub-continent.
The following three species of the tribe Diaspidini have been submitted for identification by Dr. H. K. Munro of the Department of Agriculture, Pretoria. Hall has already discussed over 60 species of this tribe from South Africa where there is a high proportion of Chionaspiform species. One descriptionbed herein, belonging to the Chionaspiform group, is so distinct from the recorded species that a new genus has been erected. This will no doubt be increased by other species after further collecting.
The Rhagionid genus Atherix is of peculiar interest on account of the gregarious habits exhibited by some of its species. The adults of both Atherix ibis and Atherix variegata are known to gather in dense, pear-shaped clusters on the ends of branches overhanging water where they oviposit and die. Enormous masses composed of eggs and dead flies may accumulate, new comers settling on the mass and ovipositing among the flies already dead.
The tests descriptionbed in this paper have been carried out during the past two years, as part of all International experiment to evaluate the protection afforded by synergised pyrethrum to the contents of treated bags. It will be seen from the tests that the treated bags protected the whole grains much better than they did the maize meal and wheat meal. They protected the wheat and maize almost completely for two years after which time these products were still in perfect condition.