The Chrysomelidae comprise an interesting family of phytophagous Coleoptera, some of which are known to be injurious to cultivated plants, while others may be potential pests. As considerable damage may be done to the food-plants due to the fact that the adults and the last larval stages are voracious feeders, some knowledge of the biology of such insects is essential if they are to be successfully controlled.
Mimaulus thesii sp.n. Derm red-brown, with dense grey scaling, which sometimes has a metallic reflection; scales erect, with their apex bent backwards so as to lie horizontally, the spaces between the scales entirely filled with an earthy indumentum so that only the horizontal tips are visible, and even these are often hidden by an earthy covering.
The Mallophaga are a group of exceptional interest because they are entirely parasitic on mammals and birds and (with rare exceptions) their evolution has lagged behind that of their hosts. For this reason their systematics will, when properly understood, throw most interesting light on the relationships and origins of the hosts. Unfortunately the systematics of the group are at present chaotic, and only a small proportion of the African genera and species have been descriptionbed.
The present paper contains descriptionptions of 6 new genera, 16 new species and two new subspecies of Acrididae, mostly collected by entomologists working on locust investigations in various regions of Africa during the last few years.
This paper is the result of studies, carried out by the author, on the species of acarines parasitic on acridid locusts (Orthoptera) collected up to the time of the writing of this paper. No serious attempt has been made in South Africa to summarise our knowledge of these mites, with the exception of a short paper of a general nature, published in 1940 by Lawrence (1). In this paper, Lawrence's results have been extended and a full account of the South African members of the genus Podapolipus is given.
Chirothrips hoodi sp.n. (Figs. 1 and 2). Female (macropterous). Length about 1.2 mm. General colour yellowish brown. Head brown with a very slight tinge of yellow; the entire thorax and abdomen paler and more distinctly tinged with yellow; femora same colour as the thorax on the outer margin, the rest more yellow; fore tibiae yellow except for the outer portion of the basal angle, middle and hind tibiae yellowish brown gradually becoming more yellow towards the apex which is practically pure yellow; all tarsi yellow.
Arhipidothrips brunneus spec. nov. (figs. 1-3). Female (macropterous). Length 1.8 to 1.9 mm. (distended). Colour: general colour brown, wings banded, first four antennal segments almost white. Head brown, eyes so dark red as to appear black, mouth-cone and palpi brown. Antennae: i very pale grey, ii, iii and iv practically white, transparent; pedicel of iii yellow; extreme base of iv (about 3 ï¿½) grey, and about 3 ï¿½ at apex of iv tinged with very pale brown; v to ix light brown, viii and ix slightly paler, v with sub-basal paler yellowish band about 4 ï¿½ in length.
The interplanting of varieties has long been an accepted practice in pear and apple orchards, the main object being to ensure satisfactory cross-pollination. Although the influence of this practice on the incidence and control of the codling moth (Carpocapsa pomonella L.) has received very little attention, recent evidence of a general nature shows that it may be of great importance. Thus Bodenheimer and Naim (1930) have pointed out that the interplanting of quince, late varieties of pear, and early and late varieties of apple results in the occurrence of flowers and blossoms over an extended period and in the provision of optimum food conditions for the pest. Doinikov (1936) again, ascribes variations in general codling moth infestation amongst neighbouring orchards to differing combinations of kinds and varieties of fruit. In both cases, restricted interplanting of varieties is suggested as a means of reducing the codling moth infestation.
Systematic Entomology (a branch that is rather neglected nowadays) has two aims in view: a) to classify and name the different species of insects so as to have them in convenient groups for further reference, b) to determine the relation between species, genera and larger groups so as to form a more or less clear picture of the evolution of the group. The former aim largely concerns the economic entomologist, enabling him to study the literature on the control and destruction of harmful insects and to trace their life-history, country of origin, etc.; it is part and parcel of the practical side of entomology; academic views are not considered.
Phenology of the fly and citrus hosts in Palestine. Graph No. 1 includes a curve representing the fluctuations in the population of the Mediterranean fruit fly during the citrus fruit season along the coastal plain in Palestine. The curve is based upon trappings during 1937-1940 in 20 densel traps hanging on citrus trees in the grove surrounding the Experiment Station grounds at Rehovoth. Other tropical and sub-tropical fruits are available in the Station grounds, offering oviposition opportunities all the year round, thus acting as ""bridge hosts"" which carryover the fly from season to season.