Intensive and extensive research on the entomological problems of this country by a fairly adequate staff of trained economic entomologists have commenced at about 1919. Considering the vastness of our country with its great variations in topography and climate, and the large number of insect pests which beset us, and considering the comparatively small number of workers in the field of applied entomology, we have no reason to feel ashamed of the results achieved.
The genus Dacus has been divided into several subgenera, but the classification is not fully satisfactory if for no other reason than that the groups are distinguished largely on secondary sexual characters. Statistical studies will have to play an increasing part in the understanding of species. This paper gives lists of mosquitoes found at Balovale and Livingstone and a few brief discriptions.
It has already been shown (Rosedale, 1945) that during metabolisism, insect nucleic acid is broken down to its components. The nucleotide guanylic acid was found to be one of the breakdown products. The work is now extended. The subjects are soldiers and workers of the termite Trinervitermes havilandi.
The larva of this butterfly was first found in 1937 but attempts to rear specimens at that time were unsuccessful. From eggs and larvae obtained during the summer of 1946-47 it has been possible to complete the record of the different stages of this species. This paper descriptionbes the egg, larva and its instars as well as the imago.
The uncertainty which exists whether a certain caterpillar is that of the false codling moth or not - especially when found on citrus, certain subtropical and wild fruits - led to the study of the larvae with the object of finding some outstanding characteristic which would facilitate quick identification. It was found, however, that no marked characteristic exists whereby larvae of A. leucotreta can be identified correctly by means of the unaided eye.
Parts of the Kigezi district are heavily over-populated and apt to suffer from famines during drought-years. Drainage operations in certain valleys with extensive papyrus swamps resulted in a great increase in the amount of cultivated swamp. The example was followed extensively by the local Africans (Bakiga). The increased cultivation of swamps was followed by a great increase of malaria in the district and these investigations were undertaken to find out whether the increase of malaria was a result of the increase in cultivation of swamps.
Six new South African species of Thysanoptera of which the types are in the authors collection are descriptionbed in this paper and new records of eight previously descriptionbed species are given. A specific character is also statistically analysed to show the chances of intergradation of two different distribution ranges. The aim of the statistical analysis is to stress the need of applying elementary statistical methods, especially where large series of specimens are available.