169 



Metz (C. W.). Observations on the Food of Anopheles Larvae. — 

 U. S. Public Health Repts., Washington, D.C., xxxiv, no. 32, 

 8th August 1919, pp. 1783-1791. 



Investigations were made with a view to evolving an indirect 

 method of AnopheUne control through diminution of the food-supply. 

 It was very soon evident that this would be practically impossible 

 owing to the wide range of suitable food materials. The species dealt 

 with were Anopheles punctipennis, Say, A. quadrimaculatus. Say, 

 and A. crucians, Wied, The range of food materials is so great that 

 no attempt was made to ascertain how many types of animals and 

 plants are concerned. It is also apparently immaterial whether the 

 food consists of living organsims or their dead remains. Experiments, 

 of which details are given, show that the purer and more sterile the 

 water is the more suitable it is for AnopheHnes provided sufficient 

 food is present. Attention is drawn to the consequent danger of 

 clearing the refuse from sloughs and stagnant puddles unless adequate 

 provision is made for subsequent mosquito eradication. 



BusHNELL (L. D.) & Jackley (J. G.). Poultry Diseases. — Kansas 

 Agric. Expt. Sta., Manhattan, Circ. no. 70, October 1918, 

 21 pp. [Received 3rd September 1919.] 



The diseases of poultry here mentioned include scaly leg and 

 depluming scabies due to mites. The usual remedial measures for 

 these as well as for lice are advocated. 



Johnson (W. B.). Domestic Mosquitos of the Northern Provinces 

 of Nigeria. — Bull. Entom. Research, London, ix, no. 4, July 1919, 

 pp. 325-332. 



Tables have been compiled from examination of all mosquitos 

 found in the author's bungalow in various localities in the Northern 

 Provinces of Nigeria over a period of six years. It was found that 

 the common mosquitos infesting houses are Anopheles costalis, Theo., 

 A. funestiis, Giles, A. rufipes, Gough, Culex decens, Theo,, and 

 C. invidiosus, Theo. These five species together constituted 97 '1 

 per cent, of the total of 11,514 individuals taken during 89 weeks, 

 17 other species making up the remaining 2*9 per cent. Some of 

 these occur in numbers but are kept under control by the anti- 

 mosquito measures that are practised in most of the stations and to 

 which they are particularly vulnerable owing to their selection of 

 breeding-places. Among them are Stegomyia fasciata, ¥., Culex 

 duttoni, Theo., and Culiciomyia nebulosa, Theo. At certain stations 

 Mansonioides uniformis. Theo., is numerous, and may also be a 

 house-infesting species. Others may be breeding freely in a station, 

 but may not be domestic pests, e.g., Stegomyia vittata, Big., S. unilineata 

 Theo. (the presence of which should be noted in view of the fact 

 that yellow fever has occurred at Kaduna), and Uranotaenia ? 

 coeruleocephala, Theo. 



A graph shows the seasonal variation of mosquitos as domestic 

 pests and is considered fairly typical of what occurs in Nigerian 

 stations. Culex spp, are most nmnerous during the hot, dry season 

 before and during the first rains. The numbers of both Anopheles 



