Hybridization tests of the two karyotypic forms of laboratory-raised, isolined colonies of Anopheles vagus Form A and B were conducted by induced copulation. The results of reciprocal and back crosses indicated that they were genetically compatible, providing viable progeny. Comparative morphometry and morphology of egg under scanning electron microscopy (SEM) revealed that the eggs of the two karyotypic forms were morphometrically and morphologically similar.