In connection with the work on the Philippine mosquitoes carried on by the authority of the Surgeon-General, U.S. Army, and “for and with the co-operation of the Medical Corps, U.S.A.,” a lot of mosquitoes recently received from Cottabato, Mindanao, P.I., makes it possible to describe a new Myzomyia; to state definitely all the differences between Stegomyia scutellaris, Walker, and the variety Sumarensis, Ludlow; and to make a small correction in the description of Myzorhyncus pseudobarbirostris, Ludlow.