NIRS age and species predictions for wild-caught mosquitoes. Panel A indicates that 92% of all the wild mosquitoes were An. gambiae s.s. as predicted by NIRS. The dotted line in panel A is the classification cut off point for An. gambiae s.s. and An. arabiensis as predicted by NIRS (<1.5 for An. arabiensis and >1.5 for An. gambiae s.s.). Panel B shows the predicted cumulative age structure of wild mosquitoes from Njage collected in two consecutive nights.