Composition of species and molecular form in the Sahelian (bottom) and riparian (top) populations among phenotyped mosquitoes. Sample size for each period is shown in white at the bottom of each bar and the percentage of each taxon is shown at the top in black (where space permits). Blue, pink, and green fractions represent An. arabiensis, M-form An. gambiae, and S-form An. gambiae, respectively. The riparian location was not sampled in June.