Mosquitoes are well known as annoying biting pests and vectors of disease-causing agents to humans and other animals. In this study the external morphology of mosquito’s two species that has medical importance, Culex sp. and Aedes sp. were compared by scanning electron microscopy. The surface structure of Culex sp. and Aedes sp. were described and illustrated with the aid of the scanning electron microscope. Many differences and similar of external morphology were detected among the Culex sp. and Aedes sp. such as size, shape of head part or scales on body and legs or morphology of the sensory structures.