32 MOSQUITO WORK IN KHARTOUM, ETC.

Mosquitoes of the Nile

that 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 gave me an opportunity of collecting mosquitoes in these parts during the months of November and December. There was little opportunity of catching mosquitoes 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 tributaries where the steamer often tied up for the night and at times was stuck fast in the Sudd, the mosquitoes boarded her in hundreds, and collection was an easy, though not

a comfortable, pursuit.1

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 Mansonia

uniformis. The accompanying tables contain the names of the different genera and species encountered2.

Blue Nile—November, 1903

Khartoum . . . . .

No swamp. A few pools in

river bank.

Khartoum North . . .

Between Wad Medani and Sennar . .

No swamps. Bush country.

Sennar ..

South of Sennar

Forest country. Swampy in

parts. Senga .

River pools. Swamps dried

up. Roseires.

River pools. Forest country.

Culex fatigans. Culex tigripes.

Stegomyia fasciata and var. mosquito. Pyretophorus costalis.

Mucidus africanus. Culex fatigans. Stegomyia fasciata var. mosquito. Theobaldia spathipalpis. Culex fatigans.

Mansonia uniformis (dark variety). Taeniorhynchus tenax. Mansonia uniformis.

Culex pallidocephala. Mansonia uniformis.

Culex fatigans. Tamiorhynchus aurites.

Culex viridis. Pyretophorus costalis. Mansonia uniformis.

Culex fatigans. Mansonia uniformis.

Pyretophorus costalis. Cellia pharcensis.

J 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. 2 Vide special article by Mr. F. V. Theobald