Erythemis simplicicollis

Erythemis simplicicollis

Family: Libellulidae

Eastern Pondhawk (Erythemis simplicicollis) is a medium-sized skimmer dragonfly often found around ponds, marshes, lake margins, wetlands, and slow-water edges. Females and immature males are bright green with dark markings along the abdomen, while mature males develop a blue to bluish-gray pruinosity over much of the body. The green face, strong build, clear wings, dark legs, and active perch-and-hunt behavior help make this species recognizable in the field.

For representative images and visual context, see the page: Eastern Pondhawk in the Gallery section.

Description

Erythemis simplicicollis is generally recognized by:

• Overall form: medium-sized, stocky perching skimmer with a strong thorax and relatively broad abdomen
• Size: approximately 36–48 mm, or about 1.4–1.9 inches long
• Color pattern: females and immature males are vivid green with dark abdominal markings; mature males become blue or bluish-gray with a green face
• Thorax: green in females and immatures, becoming blue-pruinose in mature males
• Abdomen: green with dark rectangular or band-like markings in females and immature males; blue-pruinose in mature males, often with darker terminal segments
• Wings: mostly clear, held open at rest in typical skimmer posture
• Legs: dark to blackish, often noticeable against the green body
• Eyes: green to bluish-green, with the face remaining distinctly green in many views
• Sex differences: females remain green; immature males start green and gradually develop blue pruinosity as they mature

This is a species where sex and maturity strongly affect appearance. A green individual may be a female or immature male, while a blue individual is usually a mature male.

Habitat and Behavior

Typical habitats include:

• ponds, marshes, lake edges, wet meadows, ditches, slow streams, and other still or slow-water habitats
• muddy margins, low vegetation, shoreline grasses, floating vegetation, and nearby open perches

Behavioral notes:

• Perching: often perches low on stems, twigs, bare ground, rocks, floating vegetation, or shoreline plants
• Flight: makes short hunting flights from a perch and often returns to the same general area
• Territorial behavior: males may patrol and defend small territories around suitable breeding habitat
• Hunting: adults are active predators and may take small flying insects from a perch or in short flights
• Seasonality: primarily a warm-season species in the Upper Midwest, often seen from early summer into late summer or early fall depending on conditions
• Activity: most active in sunny conditions around open wetland edges

Eastern Pondhawks are often approachable if they have settled into a hunting perch. They may shift slightly along a branch, stem, or patch of ground, but often remain within the same small area long enough for repeated photographs.

Identification

Key features for field diagnosis:

• Size and build: medium skimmer with a sturdy body and broad, athletic appearance
• Green females and immatures: bright green face and thorax with dark abdominal markings
• Blue mature males: blue to bluish-gray body with the face often remaining green
• Abdominal markings: females and immature males show dark rectangular or band-like marks along the abdomen
• Wing posture: wings held open horizontally at rest
• Leg color: dark legs contrast strongly with the green body
• Eye and face color: green face and eyes are often conspicuous in close photographs
• Behavioral cues: low perching, short hunting flights, and repeated use of shoreline or wetland-edge perches

A green Eastern Pondhawk is often identifiable from a good side or angled view showing the green thorax, green face, dark legs, clear wings, and dark abdominal markings. Mature males can be confused at a glance with other blue skimmers, but the green face, stockier build, and lack of the Blue Dasher’s strongly striped thorax and amber wing-base patches are helpful.

For photographic identification, try to capture:

• side view showing thorax color and body proportions
• dorsal or angled view showing abdominal markings
• clear view of the face and eye color
• leg color and wing posture
• terminal abdomen if sex or maturity is uncertain

Similar Species

Use this section to distinguish Erythemis simplicicollis from likely lookalikes in Minnesota and the Upper Midwest.

• Blue Dasher (Pachydiplax longipennis): Mature males are also blue, but Blue Dashers are smaller and more delicate-looking, with a pale face, striped thorax, amber wing-base patches, and a dark abdomen tip. Female Blue Dashers are yellowish to brown with striping, not bright green like female Eastern Pondhawks.

• Common Whitetail (Plathemis lydia): Males have a broad whitish abdomen and strong dark wing markings; females have a wider abdomen and bold wing spots. Eastern Pondhawk has clearer wings, a greener face or body depending on sex and maturity, and a different abdominal shape.

• Great Blue Skimmer (Libellula vibrans): Larger and more southern in distribution, with a different build and wing appearance. Eastern Pondhawk is generally more compact and shows the distinctive green female/immature pattern or green-faced blue male pattern.

• Green Darner (Anax junius): Much larger, longer-bodied, and differently shaped, with a strong darner flight style. Green Darners often patrol continuously and have a long slender abdomen, while Eastern Pondhawks perch more often and have the stockier skimmer shape.

• Female and immature skimmers: Several immature skimmers may show greenish or yellowish tones. Look for Eastern Pondhawk’s strong green face and thorax, dark legs, clear wings, dark abdominal blocks or bands, and low perch-and-hunt behavior around open wetland margins.

Ecology and Notes

Eastern Pondhawk is a widespread and familiar skimmer across much of eastern North America and is common in suitable Minnesota wetland habitat. It is often associated with sunny ponds, marshes, lake edges, slow streams, and vegetated ditches.

The species is a conspicuous predator. Adults hunt from exposed perches and may capture a variety of small insects. Around water, males defend territories and watch for females, rivals, and prey. Females may be seen near breeding habitat or hunting from nearby vegetation and open ground.

Useful field notes:

• Green individuals are females or immature males; mature males become blue with age.
• The face often remains green, even on blue mature males.
• Dark legs are a useful field mark, especially on green individuals.
• Females and immature males show dark abdominal markings that can be visible in side, dorsal, or angled views.
• Eastern Pondhawks often perch low and may use the same branch, stem, rock, or patch of ground repeatedly.
• Their strong predatory behavior can make them appear bold compared with smaller, more delicate skimmers.

Identification from photographs is usually reliable when the image shows body color, abdomen markings, wing clarity, and overall build. Multiple views are helpful for separating female and immature individuals, especially when age or sex is uncertain.

References

• Odonata Central
  https://www.odonatacentral.org/

• iNaturalist taxon page
  https://www.inaturalist.org/taxa/103678

• BugGuide: Species Erythemis simplicicollis - Eastern Pondhawk
  https://bugguide.net/node/view/577

• Minnesota Dragonfly: Eastern Pondhawk
  https://mndragonfly.info/html/skimmers/easternpondhawk.html

• MinnesotaSeasons: eastern pondhawk
  https://www.minnesotaseasons.com/Insects/eastern_pondhawk.html

• Wisconsin Odonata Survey: Erythemis simplicicollis
  https://wiatri.net/inventory/odonata/SpeciesAccounts/SpeciesDetail.cfm?TaxaID=143

• Paulson, Dennis. Dragonflies and Damselflies of the East
  Princeton University Press.