mosquito 



White 



Dueim 



No swamps. 

 South of Goz-abu-Guma 



SwamjDs. 

 Jebelein 



Swamps. 



Renk 



]\Iucli swampy land. 

 Jebel Akmet Aga 



Swamps along river bank. 

 Kodok, late Fashoda 



Much swampy land. 



Lower Sobat 



Few swamps, 

 country. 



Open grass 



WORK IN KHARTOUM, ETC. 



Nile — December, 190?) 

 Culex fatigans. 



Myzorhynchus paludis. 



. . Ta>niorhynchus tenax. 



Maiisonin unifonnis. 



Ciilex fatigans. 



Mansonia uniformis. 



Pyi'etophorus costalis. 

 . . Mansonia uniformis. 



Myzomyia nili. 

 . . Mansonia, uniformis. 



Myzorhynchus paludis. 



TcEniorhynchus tenax. 



Culex fatigans. 



Culex \'iridis. 



Sobat 



Tasniorhynchus tenax. 

 Uranota^nia sp. ? 

 Culex viridis. 

 Culex fatigans. 



33 



Middle Sobat 



Bush country. River banks 

 swampy. 



Myzomyia funesta (subumbrosa). 

 ^lansonia uniformis. 

 Culex fatigans. 

 Myzomyia nili. 

 Uranotsenia cajruleocephala. 

 Myzorhynchus paludis. 

 Tamiorhynchus tenax. 

 Pyi'etophorus costalis. 

 Anopheles wellcomei. 

 Culex dentatus ? 

 Mansonia uniformis. 

 Culex viridis. 



Baro (first 100 miles) 

 River banks high. Grass and Anopheles wellcomei. 

 open country. Some river Culex fatigans. 

 pools. Tffiniorhynchus tenax. 



Mansonia uniformis. 

 Cellia pharoensis. 

 Culex viridis. 



