33 MOSQUITO WORK IN KHARTOUM, ETC.

White Nile—December, 1903

Dueim .

No swamps. South of Goz-abu-Guma

Swamps. Jebelein.

Swamps.

Renk .

Much swampy land. Jebel Akmet Aga.

Swamps along river bank. Kodok, late Fashoda

Much swampy land.

Lower Sobat.

Few swamps. Open grass

country.

Middle Sobat.

Bush country. River banks

swampy.

Baro

River banks high. Grass and

open country. Some river pools.

Culex fatigans.

Myzorhynchus paludis.

Tamiorhynchus tenax. Mansonia uniformis. Culex fatigans. Mansonia uniformis.

Pyretophorus costalis. Mansonia uniformis. Myzomyia nili. Mansonia uniformis. Myzorhynchus paludis. Tamiorhynchus tenax. Culex fatigans. Culex viridis.

Sobat

Taeniorhynchus tenax. Uranotamia sp. ?

Culex viridis. Culex fatigans. Myzomyia funesta (subumbrosa). Mansonia uniformis.

Culex fatigans. Myzomyia nili. Uranotamia caeruleocephala.

Myzorhynchus paludis. Tamiorhynchus tenax.

Pyretophorus costalis. Anopheles wellcomei. Culex dentatus ? Mansonia uniformis.

Culex viridis.

(first 100 miles)

Anopheles wellcomei.

Culex fatigans. Tamiorhynchus tenax. Mansonia uniformis. Cellia pharoensis.

Culex viridis.

c