Agriocnemis falcifera n. sp. Agriocnemis exilis forma (c) Pinhey. 1951, Transv. Mus. Mem. 5: 124. This insect, descriptionbed tentatively in the above volume as a form of exilis Seiys, is actually nearer pygmaea (Rambur), of Seychelles and Asia, in general features, including the differential pterostigma, and like zerafica Le Roi in appendages, with the long tufts of hair. It is larger than zerafica and differs in other respects, the prothorax being more like gratiosa Gerstaecker.
As in the case with many other insect groups, far more has been written about the appearance and habits of adult Odonata than about the early stages. As far as endemic African species are concerned, valuable work has been done on the dragonfly nymphs by Barnard and Corbet; and we know a little about some species through the more occasional work on certain nymphs of the African species by Fraser, Longfield and other specialists. Nymphs of a few of the more widespread migrants have been descriptionbed in other continents.
Moulton descriptionbed Monilothrips kempi as a new genus and species in 1929, on the basis of a single female specimen of unknown habitat taken in the Darjiling District of the East Himalayas, in India. In 1941 Jacot-Guillarmod found in Basutoland a species of thrips feeding on ferns and, as this did not agree with the descriptionption of kempi in a number of important particulars, he gave it a new name, in 1942, calling it M. montanus. Eleven years later, Bailey and Cott recorded the finding of M. kempi in California, on Coffee Fern (doubtless Pallaea andromedaefolia).
The green peach aphid, Myzus persicae (Sulzer), is one of the most efficient vectors of plant viruses. In South Africa, this species has attracted much attention during recent years because of its role as vector of the potato leaf roll disease. Since M. persicae lives on many host plants before, during and after the potato season, it is of equal importance to know its bionomics on these plants as it is on potatoes. Abundance and proximity of these determine, among other factors, the time of appearance and the numbers of M. persicae on potatoes, and consequently the spread of leaf roll and other aphid transmitted potato viruses.