Additional collections of mosquitoes in the environs of Hetaura, Makwanpur District, and Birgunj, Bara District during 1990, resulted in the discovery of 4 new country records and the collection of the immature stages of 7 species previously known from Nepal only in the adult stage. Revisions and additions to the Darsie/Pradhan keys are presented so that the species new to Nepal can be identified. Also, revised Aedes keys are presented.