Which mosquito species larvae are known to feed on other mosquito larvae?

Toxorhynchites is the correct answer because it is a genus of mosquitoes whose larvae are known to exhibit predatory behavior, specifically feeding on the larvae of other mosquito species. This predatory nature is significant in the context of biological control in public health, as these larvae can help reduce the populations of disease-carrying mosquitoes by controlling their larvae populations.

In contrast, the other species listed typically do not engage in this behavior. Psorophora larvae are primarily detritivores or filter feeders, consuming organic matter found in water bodies. Aedes larvae are generalists that feed on various types of organic matter and microorganisms, while Culex larvae also feed on organic debris and microorganisms. These feeding habits do not include predation on the larvae of other mosquito species, distinguishing them from Toxorhynchites.