Wisconsin Odonata Survey


Coenagrion interrogatum  (Hagen in Selys, 1876)
Subarctic Bluet

Coenagrionidae, Pond Damsel Family
"Most Wanted" Species


Global: G5     Wisconsin: S1S3    

Distinguishing Characteristics:

Both genders of the subarctic bluet are readily identified by the wide blue shoulder stripes that are usually divided, forming a blue rectangle and square. There are additional distinctive black markings on the side and underneath of the thorax and on the 2nd abdominal segment. The body length of the subarctic bluet varies from 1.1 to 1.3 inches for both genders. The male is pale blue with black markings. The male is similar to the taiga bluet but with more black markings. The thorax has black stripes and the abdomen has black rings with a blue tip. Sometimes, the abdomen is greenish in the middle. The female is duller than the male. The female differs from the taiga bluet female by having tan streaks on the sides of the abdomen.

Description of Habitat/Range:

Found in northern US and Canada, this species prefers open fens, bogs, and marshes especially those with sphagnum moss. In Wisconsin, where we are at the southern limit of its range, it is known from just a few scattered sites.

Flight Season:

Throughout its range, the flight season is from early June to mid-August.

Shading illustrates monthly percentages of the total flight season records for the species. Each flight season record is a unique date/location/observer combination where one or more adult or an exuvia was recorded (excludes nymphs). The actual number of flight season records for each month is shown in parentheses.

Flight seasons begin earlier in the southern part of the state, often by a week or more. Also, flight charts may not be accurate for rare species because of few data available.
View user-submitted photos

(Click on photos to enlarge)
Photo of Male subarctic bluet
Male subarctic bluet. © Dan Jackson

Male subarctic bluet
Photo of Male subarctic bluet
Male subarctic bluet. © Mike Reese

Male subarctic bluet
Photo of Female subarctic bluet
Female subarctic bluet. © Mike Reese

Female subarctic bluet
Photo of Subarctic bluet pair
Subarctic bluet pair. © Dan Jackson

Subarctic bluet pair

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