The work that has been done in connection with human trypano- 

 somiasis in South Africa and Rhodesia was reviewed. 



The Conference agreed that it was necessary to ensure that natives 

 should not come to Natal from a sleeping sickness area, should 

 not pass through the Zululand fly area, and should be effectively 

 controlled in Natal. As natives from the country between the 

 Limpopo and Zambesi might in certain cases have originally come 

 from an infected area, their introduction into Natal was declared to 

 be dangerous. At the same time recommendations were made for 

 the control of natives entering Zululand from outside the Union, 

 and of those entering Natal from any quarantined area. 



The immediate necessity of a zoological survey of Zululand with 

 special reference to trypanosomiasis was emphasised, and it was also 

 considered very desirable that reliable information should be obtained 

 as to the distribution of Glossina, and the presence or absence of 

 sleeping sickness, in Mozambique. 



Bodkin (G. E.). Report of the Economic Biologist. — Brit. Guiana 

 Dept. Sci. & Agric, Rept. 1918, Georgetown, 1919, Appendix iii, 

 9 pp. [Received 22nd October 1920.] 



From mosquito larvae collected in experimental rice plots irrigated 

 with artesian well water the only species bred were Culex atratus, 

 Theo., and Uranotaenia geometrica, Theo. Provided there is a good 

 supply of running water, the danger of mosquitos breeding in these 

 plots is thought to be negligible. During a protracted spell of dry 

 weather, mosquitos became exd'eptionally abundant near Georgetown. 

 Upon investigation it was found that they were breeding in vats 

 containing the fresh water supply of the houses. Stegomyia fasciata, F. 

 {Aedes argentetts, Poiret) was the prevalent species. In a few localities 

 Taeniorhynchus {Mansonia) titillans, Wlk., occurred in large numbers. 

 The institution of artesian wells or a pipe-borne water-supply is 

 apparently the only sure means of eliminating the breeding places. 



Two species of ticks new to the Colony, Amblyomma mantiquirense, 

 Arag., and A. ohlongoguttatiim, Koch, were taken on a wild hog, 

 Dicotyles labiatus. 



Valadez (S. M.). Tiriasis de las Gallinas. [Phthiriasis of Fowls.] — 

 Revista Agricola, Mexico, v, no. 3-4, November-December 1919, 

 pp. 249-251, 2 figs. [Received 25th October 1920.] 



The Gamasid, Dermanyssus gallinae, is frequently very abundant 

 in Mexico, infesting fowls and sometimes causing severe epizootics. 

 The mites attack the fowls at night, and in the daytime infest the walls 

 and all parts of the poultiy house, being sometimes so numerous as 

 to form in places a sort of lining of some millimetres in thickness. 

 Other domestic animals are subject to infestation by this mite, chiefly 

 horses stabled near poultry houses, or dogs, cats, rabbits, etc., that 

 frequent them. 



Persons that have charge of poultry are also frequently troubled 

 by a rash on the hands caused by the mites, the fowls themselves 

 often being killed by the disease. 



The best method of exterminating the mites is to destroy the infected 

 poultry houses by burning, or if this is not possible, to paint them 

 thoroughly with a lime solution. Wooden houses should be washed 

 out thoroughly each day with boiling water. Meantime, the birds 



