Having taken part as a volunteer in the great yellow fever epidemic of 1905 in New Orleans, I was later in the same year sent by the Colonial Office to enquire into yellow fever in British Honduras and the adjacent Central American Republics.

The distribution of this Tabanid as given by Ansten † is a very wide one. In Africa it occurs from the Transvaal in the south to Egypt in the north, while outside the bounds of Africa it is found in Baluchistan, India, Ceylon, china and Japan. In the Anglo-Egyptian Sudan it occurs fairly commonly in the south, but until this year it had not been recorded from the northern provinces.

Through the kindness of Mr. S. A. Neave, the types of all new species described below have been presented to the British Museum (Natural History).

♀.—Length (four specimens) 13 to 16 mm.; width of head 4·4 to 5·5 mm.; width of front at vertex 0·5 mm. to just under 1 mm.; length of wing 10 to 13 mm.

♂ ♀. Length, ♂ (15 specimens) 8 to 8·5 mm.*, ♀ (15 specimens) 9 to 10 mm.; width of head 2·8 to 3 mm.; width of front at vertex, ♂ 0·75 mm., ♀ 1 mm.; length of wing, ♂ 8 to 8·75 mm., ♀ 9·4 to 10 mm.

The following notes are based on observations made during the months of June and July, in and near the Songwe valley.

Leaving Karonga, at the northern end of Lake Nyasa, on July 15th, I reached Katumbi on the Luwumbu River, the chief tributary of the Upper Luangwa, about a week later. I had made this river my objective, as I had already examined, in 1908, a considerable portion of the Luangwa above its junction with the Luwumbu. After following the Luwumbu down to this point, the Luangwa itself was followed for a considerable distance, chiefly on the left bank.