187 



fly is absent are also poor in game, and that when game is abundant 

 along a stream, G. morsitans is also more abundant. The author 

 expresses the view that cattle can only be utilised for agricultural 

 purposes if the game is either destroyed or driven back. In an editorial 

 foot-note this remark is considered to be too sweeping. 



G. palpalis was met with at various points. On the Dikulwe and 

 Lufira rivers and some of their tributaries, where good farm land 

 exists in an infested area, the complete clearing of the banks will 

 dispose of the fly. This could be easily done in this region, as the 

 width of the belt of bush is only 3 or 4 yards and it is not continuous. 



VAN Saceghem (M. E.). Travaux du Laboratoire de Bact6riologie 

 v6t6rinaire de Zambi, Bas Congo. III. Etude sur la Dermatose 

 contagieuse (Impetigo contagieux). [Work of the laboratory of 

 veterinary bacteriology at Zambi, Lower Congo. III. A study of 

 contagious dermatosis. ]-"5uii. Agric Congo Beige, London, v, 

 no. 4, December 1914, pp. 567-573, 3, figs. [Received 15th 

 October 1915.] 



Contagious dermatosis has often been confounded with many skin 

 affections, so common in hot countries, which has resulted in great 

 confusion in the descriptions of the disease by various observers. 

 Dermatosis has been attributed to an acariasis, particularly to 

 demodectic mange. The co-existence of two distinct diseases on one 

 and the same animal is the cause of this confusion. These are caused 

 by Demodex folliculorum var. bovis and the fungus, Dennatojphylus 

 congolense, respectively. 



MacGregor (M. E.). Notes on the Rearing of Stegomyia fasciata in 

 London.— J^. Trop. Med. Hyg., London, xviii, no. 17, 1st September 

 1915, pp. 193-196. 



In May 1915, the Wellcome Bureau of Scientific Research received 

 through Sir James Kingston Fowler, Chairman of the Yellow Fever 

 Commission, a few dried leaves of the West African cotton-wood tree, 

 on which were eggs of Stegomyia fasciata ; these had been sent to the 

 Colonial Office by Mr. A. W. Bacot from Sierra Leone. The leaves had 

 been at least three and a half months in a dried condition. Under the 

 microscope, a fairly large number of eggs were seen to be adhering 

 to them. About 75 per cent, of these were apparently dried up, while 

 the rest appeared normal. The leaves were cut up into pieces about 

 1 in. square and placed on tap-water in glass containers and kept at 

 the temperature of the laboratory. This was done on 29th April at 

 11.30 a.m., and by 9.30 a.m. the next day the water was crowded with 

 larvae in such numbers as to leave no doubt that the shrivelled eggs, 

 as well as the normal ones, had hatched. This first generation of 

 larvae was divided into approximately equal numbers and placed in 

 separate containers : No. 1 containing tap water contaminated with 

 straws from horse manure and the organic matter and bacteria thereon. 

 No. 2 containing fresh water from the Serpentine in Hyde Park. 

 Under equal conditions of light and temperature, the larvae in container 



