The electrophoretic variation of four enzymes of wild Anopheles pharoensis in Mwea Irrigation Scheme, Kenya, was studied between 1987 and 1988. The enzyme loci examined were aldehyde oxidase, a-glycerophosphate dehydrogenase, β-hydroxyacid dehydrogenase and lactate dehydrogenase. All the loci examined were dimorphic. A mean heterozygosity (H) of 0.341 was obtained, which is comparable to values for other mosquito species. The allelic frequencies were in genetic disequilibrium compared to Hardy-Weinberg predictions. It is proposed that there may be more than one species in the taxon Anopheles pharoensis.
