Sandal on bank of Nile. A curious breeding place of *Pyretophorus costalis*.

Type of Upper Nile steamer. Common breeding ground for *Stegomyia fasciata* and *Culex fatigans*.

River front, Khartoum, shewing the steep nature of the bank in which pools are often left by the falling Nile. The proximity of the Post Office to the steamers is also indicated, vide p. 11.

Pools left by the falling Blue Nile. These constitute favourite breeding places for *Pyretophorus costalis* and *Culex fatigans*, especially the former.