262 SIR RUBERT BOYCE — THE PREVALENCE, DISTRIBUTION AND 



NOTE. 



In order that Medical Officers should have a ready means of identifying 

 Stegomyia and its larvse^ I would recommend that all such Officers should 

 be supplied v\dth : — 



1. Examples of the male and female Stegomyia ; 



2. Examples of the allied species ; 



3. Specimens of authentic larvae. 



References. 



Le Moal. — Etudes sur les moustiques en Afrique occidentale francaise. 



Paris, 1906. 

 Otto, L. — ' Ueber Gelbfieber in Afrika.^ Archiv f. Schiffs u. Tropen 



Hygiene, Bd. xi. p. 147. 

 Ross, Ronald. — First Progress Report of the Mosquito Campaign in Sierra 



Leone. Liverpool School of Tropical Medicine, Memoir v, part 1, 1901. 

 DuTTON, J. E. — Report of the Malaria Expedition to the Gambia. Liverpool 



School of Tropical Medicine, Memoir x, 1902. 

 Prout, W. T. — Lectures on Elementary Hygiene and Sanitation, with 



special reference to the Tropics. London, 1905. 

 BouFFARD, Gr. — ' La defense de Bamako (Haut Senegal) centre la fievre 



jaune, 1906.'' Bulletin de la Societe de Pathologic Exotique, i, p. 412, 



July 1908. 

 BouFFARD, G. — ' Le Stegomyia fasciata au Soudan francais.' Bulletin de 



la Societe de Pathologic Exotique, October 1908. 

 Otto & Neumann. — ' Studien liber Gelbfieber in Brasilien.' Zeitschrift 



f. Hygiene, 1905. 

 Ribot. — Rapport annuel sur les services d'Hygiene du Senegal en 1905. 

 W. Wesche. — ' On the Larval and Pupal Stages of West African Culicidse.' 



Bulletin of Entomological Research, vol. i, pt. 1, p. 7, April 1910. 

 Graham, W. M. — ' The Study of Mosquito Larvae. ^ Bulletin of Entomo- 

 logical Research, vol. i, pt. 1, p. 51, April 1910. 



[The question as to the original home of Stegomyia fasciata, or of the 

 disease which it carries, is one which is of something more than academic 

 interest. For we may resonably suppose that if so virulent a disease as 

 yellow fever has long been prevalent in any given country, the indigenous 

 population would, by the simple process of natural selection, either be wiped 

 out, or gradually develop a relatively high degree of immunity. Thus it 

 is conceivable that the existence of such immunity may possibly give us 

 a sound clue as to the country in which the disease has been longest 



