Eastern Tailed-Blue

Everes comyntas

The Eastern Tailed-Blue is the most commonly seen Blue in the state. It is found throughout the state from May though October. Although all the Blues may do some puddling, this species seems to be more prone to congregating in groups at moist areas along ponds and streams. I have seen nearly 100 Eastern Tailed-Blues along the edge of a five-acre pond in August.

Identifying characteristics

Above, the male is blue with a black border, an obvious tail, and an orange spot or two near the tail. The female is essentially the same below, but is black, not blue, above (see second photo). Below, the Eastern Tailed-Blue is a light gray with a variety of small black marks, a small tail (often very hard to see on worn specimens), and orange spots near the tail.

Similar species

The Eastern Tailed-Blue should not be confused with any other Blue in the state, except in the far northwestern counties where the Western Tailed-Blue has been found. These two species are very easily confused in the field. In general the Western Tailed-Blue has less orange below in the male (one spot versus 2-3 in the Eastern) and the female has some blue basally while the Eastern female is mainly dark above.

Habitat

Open, often disturbed areas, prairie restorations, and city parks.

Flight

The Eastern Tailed-Blue has 3-4 broods in Wisconsin, and is present as an adult from May through October.

Abundance

Common throughout the state.

Recent Eastern Tailed-Blue Sightings

Date	County	Reported by
May 28, 2023	Jefferson	Ethan Brown
May 27, 2023	Polk	Terry Mortier
May 27, 2023	Dane	Mike Reese, Karen Ober...
May 27, 2023	Ozaukee	Jeremy Meyer
May 26, 2023	Green Lake	Rory Williams

Locations