The identification of mosquito larvae, especially of the genus Anopheles, is now so common a practice in the Tropics that the need of a simpler method of mounting has been widely felt. Whereas in many instances a larva can be identified by examining it alive in a drop of water, in countries where many similar forms are met with mistakes are sometimes made. A great deal of identification work is doneby Health Inspectors who have not the practice necessary for determining species while they are alive, and in Malaya, where some species cannot be separated by an examination of the anterior clypeal hairs alone, a quick method of mounting so that occipital hairs and other structures can be seen is required.