The systematics of the mesostigmatic mites parasitic on vertebrates are still in a very unsatisfactory condition. Zumpt (1950a) in his first paper on this group adopted, in general outline, the classification given by Vitzthum in his last comprehensive work (1943) in which he created a large family Laelaptidae containing, as subfamilies, also the Liponyssinae, Dermanyssinae and those groups which live in the respiratory system of various vertebrates. Various keys to the subfamilies of Laelaptidae parasitic are given.
The following notes comprise a second instalment to those published under the same title in Part I (Taylor, 1949), and, in some cases, are supplementary to them, additional data concerning various species having been obtained during the last two years.
The following observations relating to the insect trapping habit were made upon the plant H elichrysum C ooperi growing near Champagne Castle at an altitude of 5,500 to 6,000 feet on the slopes of the Drakensberg in Natal, during November, 1944, and January, 1945.
A preliminary investigation of the relative toxicity of two new insecticides to larvae of the European houseborer was carried out during the summer of 1950-1951. These two insecticides were evaluated against a 5% solution of pentachlorophenol, one of the most commonly used timber preservatives.
Frizzell in 1933 (Amer. MidI. Nat., 14, 637-668) listed no less than 233 terms referable to various kinds of type-specimens. Terms are intended to make working in certain groups of science easier and more simple, but not to complicate matters. The drawing up of such an enormous number of names for designating categories, which may be logically restricted to a few generally understandable ones, only leads to confusion and uncertainty. The categories of terms for type-specimens are revised by the authors.
Up to the present it has been thought that sexual dimorphism was of rare occurrence in Membracidae, and only one such species, Platybelus brunneus Funk (1934) has so far been descriptionbed from Africa. I was able to borrow the type and paratype from the National Collection of Insects, Pretoria, and on examining them I found that Funkhouser's figures were not accurate. I have therefore prepared new drawings of this species from the types, which are here reproduced.
The incidence of red scale, Aonidiella auranti Mask., varies in different parts of South Africa. This is due to climatic and concomitant conditions, but the question arises whether chemical factors of the soil, and hence the nutrition of the tree, might not have an important bearing on the subject. To investigate this at Letaba a small experiment was started in which young rough lemon seedlings were grown in sand cultures with nutrient solutions in which either calcium, phosphorus or nitrogen, was reduced as compared to the control.
The study of the Ethiopion members of the genus Sarcophaga Mg. which I started about 2 years ago has resulted in the discovery of further new species. The genus is restricted in the same sense as done by Senior White, Aubertin and Smart (1940) and Seguy (1941) who recognised one well defined and easily identifiable genus with numerous species. A satisfactory subgeneric division of the Ethiopian Sarcophaga-species will be given at a later date. The paper gives a key, a descriptionption and a systematic-synonymic list of the Ethionian Sarcophaga species.