Fig. 1. Hemolymph pH of larval Aedes aegypti (solid line) and Ochlerotatus taeniorhynchus (broken line) is highly regulated across the entire tolerable pH range from pH 4 to 11. Data are raw means ± S.E.M., sample size=6 replicates per species and pH value. **0.001<P<0.01; *0.01<P<0.05; NS, P>0.1 for t-tests comparing pH of the two species at each ambient pH.