77 



Fricks (L. D.). Rocky Mountain Spotted Fever : A Report of Labora- 

 tory Investigations of tlie Virus. — Public Health Reports, 

 Washington, D.C., xxxi, no. 9, 3rd March 1916, pp. 516-521. 



Among the facts determined by various workers during 14 years of 

 investigation are the following : Man, rhesus monkeys, and at least 

 six varieties of small wild rodents found in the Rocky Mountain region 

 are susceptible to infection, while the larger domestic animals are 

 generally immune. Of laboratory animals, guinea-pigs and white 

 rats are highly susceptible, while white mice are apparently immune. 

 The virus is transmitted by the bite of infective wood ticks (Derniacentor) 

 and no other biting Arachnid or insect has been found capable of 

 transmitting it. 



von EzDORF (R. H.). Demonstrations of Malaria Control. — Public 

 Health Reports, Washington, B.C., xxxi, no. 10, 10th March 1916, 

 pp. 614-629, 4 figs. 



The results of antimalarial measures undertaken at Roanoke Rapids, 

 North Carolina, and Electric Mills, Missouri, are given in this paper. 

 At Roanoke in 1913, Anopheles quadrimaculatus was breeding 

 extensively and was readily found in houses ; in 1914 very few 

 were found, and in 1915 this species had disappeared, only a few 

 A. punctipennis being present. The incidence of the disease was very 

 greatly reduced in both localities. 



Tsetse-Fly and Big Game in S. Rhodesia. — Correspondence from the 

 British South Africa Company, received from the Colonial Office 

 17th March 1916. 



In the area visited by the Government Entomologist in November 

 and December 1914, between the Sengwa and Umniati Rivers, tsetse-fly 

 {Glossina morsitans) appears to be extending its range. Although 

 the game laws have been suspended in this region, there is no 

 appreciable decrease in the numbers of game, except in the case 

 of elephant. A case of trypanosomiasis was reported near the 

 Sengwa River in November 1914 and in this connection the Medical 

 Director found that the fly was spreading eastwards and recommended 

 the destruction of antelopes. In a report from the Director of 

 Agriculture, relating to the destruction of game in affected districts, 

 the extermination of game in a clearly defined zone is considered 

 feasible and likely to have the desired effect. It is suggested that the 

 services of natives, armed in some cases, should be utilised for this 

 purpose. The cost would be partly covered by the sale of the skins, 

 etc., of the animals shot. Blood smears should be made from every 

 animal killed. Estimates should be made of the numbers of game in 

 each area shot over, and also of the distribution and quantity of the 

 fly before and after the operation ; this work should be controlled by 

 the entomologist. It is proposed that this extermination should only 

 take place in a belt situated on the north, south and east of the free 

 shooting area of Mafungabusi, which is bounded on the west by an 



