Wisconsin Odonata Survey

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Enallagma traviatum westfalli  Selys, 1876
Slender Bluet


Coenagrionidae, Pond Damsel Family
"Most Wanted" Species

The bluets form a group of about 17 similar species in Wisconsin in which the males usually share the characteristics of having blue and black stripes on the thorax, and blue and black markings on the abdomen. In-hand examinations are usually needed to identify them, although they can be grouped into subcategories based on the amount of black showing on the abdomen. Males are easily identified, under magnification, by the shape of their terminal appendages. Females are generally duller than males, and they are more difficult to identify, which is accomplished by subtle differences in the shape of the mesostigmal plates on the top of the thorax. Generally, males are bright blue while the females are green or yellow-green or blue. There are some species that are yellow-orange, a mix of various colors, or black with some blue.

Status-Global/State:

Global: G5     Wisconsin: S1S3    

Distinguishing Characteristics:

The male of this slender species is a black-type bluet because of its predominantly black abdomen. The slender bluet varies from 1.1 to 1.3 inches. The male's head is mostly pale blue. The pale blue thorax has broad black mid-dorsal stripe and thin black shoulder stripes. The abdomen is mostly black above with a blue tip and black appendages. The female has a similar thorax but pale colors pale blue or tan. Her abdomen has a pale blue tip.

Description of Habitat/Range:

In eastern United States, this species likes permanent ponds and lakes with abundant emergent and aquatic vegetation. In Wisconsin, it is known from just a few central counties.

Flight Season:

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


Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
17%
(4)
83%
(19)
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 slender bluet
Male slender bluet. © Dan Jackson

Male slender bluet
Photo of Male slender bluet
Male slender bluet. © John & Cindy Anderson

Male slender bluet
Photo of Male slender bluet abdomen tip
Male slender bluet abdomen tip. © John & Cindy Anderson

Male slender bluet abdomen tip
Photo of Female slender bluet
Female slender bluet. © Dan Jackson

Female slender bluet
Photo of Slender bluet pair
Slender bluet pair. © Dan Jackson

Slender bluet pair



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