Anopheline mosquito density on Bioko Island, Equatorial Guinea in 2009. Number of anopheline mosquitoes collected by human landing collections indoors (left panel) and outdoors (right panel) per person per night in three locations. The dominant species in Mongola was An. gambiae s.s.; in Arena Blanca An. melas; and in Riaba both species were almost equally abundant. Bars indicate 95% confidence intervals.