Insects Active at night

Square-spotted Clay

Xestia stigmatica

iNaturalist Wikipedia

A gem of the late-summer garden, the Square-spotted Clay is easily recognized by the bold geometric markings on its velvety brown wings. This hardy nocturnal moth is a favorite for backyard observers across Europe and Western Asia.

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Quick Identification

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Size

Wingspan of 37–44 mm (1.4–1.7 inches)

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Colors

Rich reddish-brown or purplish-brown forewings with a prominent dark square spot; hindwings are a smoky brownish-grey.

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Key Features

Distinctive dark square spot (stigma) located between the orbicular and reniform markings
Rich chocolate or purplish-brown ground color
Pale subterminal line near the wing edge
Wings held flat over the body in a triangular shape when at rest

When You’ll See Them

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Activity pattern Active at night

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Peak hours 10 PM - 2 AM

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Season Late July to September

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Diet Adults drink nectar from flowers like Buddleia, Ragwort, and Heather; larvae are generalist feeders on Primrose, Violet, Bramble, and Sallow.

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Habitat Broad-leaved woodlands, mature gardens, hedgerows, and heathland.

Behavior

The Square-spotted Clay is a nocturnal moth that emerges during the height of summer. During the day, it is a master of concealment, resting motionless among leaf litter or against the dark bark of trees where its earthy tones provide near-perfect camouflage. It is generally a solitary flyer, though it can be found in higher concentrations in areas with abundant nectar sources or larval food plants.

Unlike some moths that are purely attracted to light, the Square-spotted Clay is also a frequent visitor to 'sugar'—a mixture of fermented sweets and alcohol used by enthusiasts to attract nocturnal insects. It has a relatively steady, low flight pattern and is often observed crawling over flowers rather than hovering. It plays a minor but helpful role in the pollination of late-summer wildflowers and garden shrubs.

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Camera Tips

To capture high-quality images of the Square-spotted Clay, you should utilize a 'light-trap' setup in front of your camera. Hang a white cotton sheet vertically and position a UV or actinic light source to shine upon it. Place your camera on a tripod approximately 1-2 feet away from the sheet. When the moth lands on the white fabric to investigate the light, the contrast will allow your camera's AI to easily detect and focus on the intricate wing patterns.

Sugar baiting is another exceptional method for this specific species. Mix overripe bananas, brown sugar, and a splash of dark ale into a thick slurry and paint it onto a fence post or tree trunk at eye level. Mount your camera 3 feet away, facing the bait. The Square-spotted Clay is highly attracted to these fermenting scents and will often stay stationary for long periods while feeding, allowing for crisp, clear photos that aren't possible during flight.

Because these moths are most active on warm, still, and humid nights, monitor the weather forecast and set your equipment out when the overnight temperature is expected to stay above 10°C (50°F). Use the macro setting on your camera if available, and rely on infrared (IR) night vision to avoid startling the moth with a harsh white flash. If you are using a motion-triggered camera, ensure the sensitivity is set to high, as the gentle fluttering of a moth may not trigger lower settings.

Similar Species

Species that look similar or are commonly confused with Square-spotted Clay.

Double Square-spot

Smaller with a more yellowish-brown ground color and two distinct dark spots instead of one prominent square.

Six-striped Rustic

Features more prominent transverse lines (stripes) across the wing and lacks the singular deep-colored square spot.

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Frequently Asked Questions

Square-spotted Clay moths are strictly nocturnal. They begin their activity about an hour after sunset, with peak flight and feeding times occurring between 10 PM and 2 AM during the months of August and September.

You can attract them by planting nectar-rich late-summer flowers like Buddleia or by using a 'sugar' lure made of fermented fruit and sugar painted onto tree trunks. They are also attracted to UV light sources.

As adults, they feed on the nectar of various wildflowers and the honeydew produced by aphids. As caterpillars (larvae), they eat a variety of low-growing plants including primroses, violets, and brambles.

Yes, they are quite common in suburban gardens, especially those with plenty of shrubbery, hedges, and nearby wooded areas or parks.

The Square-spotted Clay is usually larger and has a more reddish or purplish tint compared to the Double Square-spot. The 'square' mark on the Square-spotted Clay is typically darker and more sharply defined against its wing color.

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