The work of Dr. J. J. Simpson (Bull. Ent. Res. v, pp. 1–36 and Bull. Ent. Res. viii, pp. 193–214) has added largely to the knowledge of the bionomics of the larger blood-sucking insects of the Gold Coast, especially of the Northern Territories of the Colony, yet up to the present time, with the exception of the records obtained from one or two stations, singularly little is known with regard to the distribution in the Northern Territories of the smaller blood-sucking insects such as mosquitos and “sandflies.”