Species: Aedes spencerii spencerii


This species has been reported to be migrate towards city and town lights and is a serious pest of livestock and humans when present in high numbers. It is fairly common but is not known to be involved in disease transmission.


Ae. spencerii overwinters in the egg stage. Larval habitats include barrow pits and depressions that contain water from melting snow and low areas filled with seepage from runoff.

Identifying Characteristics:

Pointed abdomen, no leg banding, wing veins alternating dark and pale scales, abdominal terga with a dorsal median longitudinal stripe. Similar to Ae. spencerii idahoensis.

Distribution Map:

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Mosquito and Vector Surveillance Program

MSU Extension - Department of Animal and Range Sciences

Montana State University
P.O. Box 172900
Bozeman, MT 50717-2900

Location: Marsh Labs, Room 59

Veterinary Entomology Research Associate:

Marni Rolston

Professor Emeritus of Veterinary Entomology:

Dr. Greg Johnson


Dr. Grant Hokit (Carroll College)