They occur in snow melt pools and usually do not fly far from their larval sources. They are day or night biters. Immature stages develop in any standing freshwater source. Females are night feeders mostly on birds, but will switch to mammals including man. These mosquitoes breed in ponds, basins, and artificial containers.
Females actively feed at dawn and dusk mainly on large domestic animals and man.
Females do not fly far from larval sources, and are vicious day biters of large mammals including man. Encephalitis is a flu-like illness caused by a virus. Symptoms include high fever and inflammation of the brain. Severe infections are usually marked by acute onset, headache, high fever, disorientation, and occasionally convulsions. Mosquitoes become infected while feeding on birds that carry the virus.