Descriptions and a morphometric analysis, based on scanning electron micrographs, are given of the eggs of the five known species of the Anopheles quadrimaculatus complex. Following an initial account of the fine structure of the eggs, represented by species A, electron micrographs are used to illustrate interspecific differences visible at low magnification in whole eggs and at higher magnification as appropriate for particular structural features. Extensive tabulations and synoptic comparisons are given of 42 attributes of the eggs. For multivariate analysis, 13 characters were selected and used as the basis for principal component and discriminant function analyses. The first seven principal components accounted for 91.18% of the variation, while the first two discriminant functions captured 90.97% of differences between species. Classification by discriminant functions of 87 eggs examined was successful in assigning 85 correctly to species. The study suggests that species C1 and C2 are the most closely related in the complex and are followed in relatedness by species A and B; species D is closer to C1 and C2 than to A and B.