32 MOSQUITO WORK IN KHARTOUM, ETC. 



thiit His Excellency the Governor-General kindly gave me permission to join a 

 party proceeding up both the Blue Nile and the White Nile and its tributaries 

 Mosquitoes of gave me an opportunity of collecting mosquitoes in these parts during the months 

 of November and December. There was little opportunity of catching moscpiitoes 

 on shore save at certain places. This rather interfered with the work as far as 

 the Blue Nile was concerned, but on the White Nile and triljutarics where the 

 steamer often tied up for the night and at times was stuck fast in the Sudd, 

 the mosquitoes boarded hei- in liundreds, and collection was an easy, though not 

 a comfortable, pursuit.' 



The accompanying map, for which I am indebted to the Director of Intelli- 

 gence, War Office, shows the places where observations were made, and has the 

 names of the different genera met with recorded on it. It is intended specially 

 to show where the sub-family Anophelina and its genera flourish in greatest 

 abundance, but also exhibits the great prevalence of the filaria-carrier ]\Iansonia 

 uniformis. The accompanying tables contain the names uf the different genera 

 and species encountered^. 



Blue Nile — November, 1903 



Khartoum Culex fatigans. 



No swamp. A few pools in Culex tigripes. 



river bank. Stegomyia fasciata and var. mosquito. 



Pyretophorus costalis. 

 Mucidus afi'icanus. 



Khartoum North Culex fatigans. 



Stegomyia fasciata var. mosquito. 

 Theobaldia spathipalpis. 

 Between Wad Medani and Sennar . . Culex fatigans. 



No swam^js. Bush country. Mansonia uniformis (dark varietv). 



Ta3niorhynchus tenax. 



Sennar Mansonia uniformis. 



Culex pallidocephala. 



South of Sennar Mansonia uniformis. 



Forest country. Swampy in Culex fatigans. 



parts. Tieniorhynchus aui'ites. 



Senga Culex viridis. 



River pools. Swamps dried Pyretophorus costalis. 

 up. Mansonia unifonnis. 



Roseires Culex fatigans. 



River pools. Forest country. Mansonia uniformis. 



Pyretophorus costalis. 

 Cellia pharoensis. 



' I would here express my thanks to Mr. and Lady Fitzgerald, Miss Leigh Hunt, and Mrs. Balfour, for 

 their kind help in the collection of specimens. ' J'i'rfe special article by Mr. F. V. Theobald 



