Insects diurnal

Martha's Pennant

Celithemis martha

A small but brilliant jewel of the summer wetlands, Martha’s Pennant is famous for its habit of flagging from the tallest reeds. Watch for the mature males, which transform from golden-yellow into a striking, deep crimson as they age.

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Quick Identification

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Size

25–33 mm (1.0–1.3 in) long with a 45–55 mm (1.8–2.2 in) wingspan

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Colors

Mature males are deep crimson or maroon-black; females and juveniles are golden-yellow with black abdominal spots. Both have clear wings with dark patches at the base and center.

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Key Features

Distinctive dark patches at the base and midpoint of each wing
Deep red to brownish-black body in mature males
Habit of perching on the very tips of tall vegetation
Small, slender skimmer profile

When You’ll See Them

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Activity pattern diurnal

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Peak hours 10:00 AM – 4:00 PM

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Season July-September

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Diet Carnivorous; they primarily eat small flying insects like mosquitoes, gnats, and flies caught mid-air.

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Habitat Acidic ponds, lakes, and bogs with sandy bottoms and abundant shoreline vegetation.

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Behavior

Martha's Pennant is a classic 'percher,' so named for its habit of resting on the very tips of reeds, twigs, or tall grasses. From these vantage points, they sway in the wind like small flags or pennants, scanning the environment for both potential prey and rivals. Unlike larger dragonflies that spend hours on the wing patrolling a territory, this species prefers to hunt in short, explosive bursts, darting out to snatch a flying insect and returning almost immediately to the same or a nearby perch.

Socially, they are quite competitive. Males will aggressively defend their favorite perching spots, often spiraling upward in 'dogfights' with other males to establish dominance over a prime hunting or mating location. They are highly sun-dependent; during the hottest parts of the day, you may observe them 'obelisking'—pointing their tails directly at the sun to reduce the surface area exposed to heat, a fascinating example of insect thermoregulation.

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Camera Tips

To capture Martha's Pennant on camera, you must think like a percher. These dragonflies are creatures of habit and will return to the same tall reed or twig repeatedly. Position your camera on a tripod at a height of about 3 feet, aiming it at the tallest piece of vegetation near a pond's edge. Using a macro lens or a high-quality zoom is vital, as this is one of the smaller pennant species and requires close-up detail to distinguish it from its cousins. A fast shutter speed of at least 1/1000s is recommended to freeze the movement of their wings.

If your backyard doesn't have natural reeds, you can 'engineer' a photo opportunity by placing several 3-foot bamboo garden stakes near the water. Angle your camera so that the background is as distant as possible; this creates a beautiful 'bokeh' effect that makes the crimson body of the male Martha's Pennant pop against a soft, green backdrop. Because they are most active in direct sunlight, mid-day is actually the best time for filming, though you should be mindful of harsh shadows. Try to position the camera with the sun at your back to illuminate the intricate wing veins.

For AI-powered cameras, set your motion detection zone to the top 20% of your perching stake. This prevents the camera from triggering every time a ripple moves the water or a low-lying leaf blows in the wind. Since these insects are cold-blooded, they won't show up on thermal sensors, so rely on optical motion detection. If you're looking for the best seasonal window, late July is the 'sweet spot' when populations are at their densest and the males have reached their most brilliant deep-red coloration.

Similar Species

Species that look similar or are commonly confused with Martha's Pennant.

Halloween Pennant

Much larger with more extensive orange and black banding across the entire wing.

Double-ringed Pennant

Lacks the vibrant red of the male Martha's and has different black markings on the abdomen.

Calico Pennant

Has heart-shaped spots on the abdomen and more extensive red markings on the wings.

Frequently Asked Questions

They are most active during the sunniest parts of the day, typically from 10 AM to 4 PM, when temperatures are high enough to fuel their rapid flight.

The best way to attract them is to maintain a healthy pond with acidic water and plenty of 'sentinel' perches like tall native grasses or thin branches sticking out of the water.

They are voracious predators of small flying insects, including mosquitoes, midges, and small flies, which they catch during short aerial sorties.

They are somewhat localized; you'll find them in suburban areas only if there are nearby acidic lakes, bogs, or sandy-bottomed ponds, particularly in the coastal Northeast.

Look for the specific dark patches in the center and base of the wings. While they look similar to the Halloween Pennant, Martha's Pennant is smaller and the males are a much deeper red.

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