Some form of short-period fever, apparently sandfly fever, seems to have been giving trouble in the Gallipoli area. This fact, together with the small amount of information at present available on the life-histories of the species comprising the genus Phlebotomus, has led me to publish the present note in the hope that it might be of use to medical officers by giving them easily-seen characters by which the early stages of three species may be differentiated. In collaboration with my assistant Mr. Patel, I have been engaged for some time in collecting material for a complete account of the life-histories of these species, but as the publication of this memoir must be deferred to a later date, the present article contains merely a few points which are likely to prove useful under practical conditions of working in the field, and a note on the very curious larval tail-bristles.