Five new species of Cercens Latreille, 1802 are descriptionbed, namely, laterifurcata, albopectoris, laterimaculata, rufofacies, fitzgeraldi; and nine known species are recorded or redescriptionbed, including vagula Kohl and lobaba Kirby of which males are now available.
The species which Naude (1926) assigned to the genera Eugnathodus Baker, 1903 and Cicadula Zetterstedt, 1840, are redescriptionbed; E. nigromaculatus could not be redescriptionbed as the type specimens are missing. The other species of Eugnathodus, i.e. auranticulus, flavidus and fumigatus, belong to the genus Balclutha Kirkaldy, 1900. E. flavidus is synonymized with Balclutha hebe (Kirkaldy). One of Naude's types offumigatus is descriptionbed as a new species, Balclutha petrusa.
A new genus and species Colophorina cassiae and nine other new species: Euphyllura speciosa, Pseudophacopteron electum, P. pretoriensis, P. caffrariensis, Diaphorina minor, D. loranthi, Euphalerus marginalis, Psylla loranthi and Trichochermes insleyae are descriptionbed and figured. Agonoscena crotalarias (Pettey) is discussed, with an account of the nymph, and figured.
The morphology of the larva and nymph of Amblyomma hebraeum has been descriptionbed in detail using the scanning electron microscope and as far as possible this has been illustrated with relevant micrographs. The technique of the scanning electron microscope has also made possible a revision of the setal arrangement on the palps of the larva and nymph of of Amblyomma hebraeum, in the larvae of other species of this genus and in larval representatives of the genera Boophilus, Hyalomma, Rhipicephalus and Haemaphysalis. Detailed consideration has been given to the structure of Haller's organ in the larvae of these ticks, as well as a comparison between larvae and nymphs of the bont tick.
Detailed studies on the morphology of the immature stages of Boophilus decoloratus are sparse. The present work, using scanning electron microscopy, aims at clearing up existing misconceptions and considers homologies between larvae and nymphs.
The damage to host skin following infestation by the larvae and nymphs of Hyalomma Tufipes is descriptionbed. This is initiated by secretions of lysins of tick salivary origin, and the subsequent lesion results from cellular activity of the host. A possible theory on the method of feeding by hard ticks, with particular reference to H. rufipes, is proposed. This may also explain how ticks with long mouth parts become detached on completion of feeding.
A new species, Linognathus nevilli, is descriptionbed from specimens found on the feet of the antelope Aepyceros melampus and apparently confined to this part of the host's body. The relative size of the spiracles as an indication of the biotope in Linognathus is discussed.
Specimens of two species of Myopsocus Hagen are represented in material collected by Mr. A. L. Capener, one of which, M. capeneri descriptionbed here, is new. The other, M. maximus (Smithers) comb. nov. was originally placed in the genus Lichenomima EnderIein; Badonnel (1967) has shown that all species of Lichenomima should be placed in Myopsocus.
The Mediterranean genera Acanthogeron Bezzi and Lissomerus Austen are synonyms of Dischistus Loew. Bombylodes Paramonov and Efflatounia Bezzi are re-defined; Karakumia Paramonov is a synonym of Efflatounia and Efflatounia berbera spec. nov. is descriptionbed from Algeria. The distribution of the genus is discussed and one group of species is shown to be probably associated with a genus of Rubiaceae.
The recent revision by Kessel and Clopton (1970) of the Platypezidae of the Ethiopian region lists 38 species belonging to 8 genera. Only one species, the widely distributed Plesioclythia hendricksoni Kessel and Clopton, is recorded from Kenya, from the Teita Hills. Indeed, only 10 species are reported from the whole of tropical Africa, the great majority of the Platypezidae known from Africa being descriptionbed from southern Africa.
In the laboratory at fluctuating temperatures of about 20ï¿½C, the larval stage of Nudaurelia cytherea clarki Geertsema lasts about 76 days, Pseudobunaea irius (F.) 62 days and Holorcerina smilax (Westw.). with four instars, 45 days and with five instars 54 days. The digestion coefficients were 22,8, 17,1 and 21,0 per cent for the three species.