In the course of identifying the Culicidæ in the National Museum collection and those received by Mr. L. O. Howard from various correspondents, for mention in a paper which he is about to publish, entitled, “Notes on the Life-history of Culex pungens, with remarks about other Mosquitoes,” three forms were met with which elearly represent new species; and as Mr. Howard desires to exclude all matter of a purely technical nature from his paper, it was deemed abvisable to publish the new species in one of our scientific periodicals.