Insects Active during the day

Common Cardinal Beetle

Pyrochroa serraticornis

iNaturalist Wikipedia

The Common Cardinal Beetle is a vivid splash of scarlet in the early summer garden. Distinguished by its all-red head and saw-toothed antennae, this striking insect is a master of sun-drenched floral displays.

0 Sightings

0 Habitats

Quick Identification

straighten

Size

10–14 mm (0.4–0.55 in) in length

palette

Colors

Bright scarlet-red head, thorax, and wing cases (elytra); jet-black legs, antennae, and underside

visibility

Key Features

Bright red head, matching the color of the body
Distinctive saw-like (serrated) black antennae
Soft, flattened elytra with a slightly felt-like texture
Large, prominent black eyes on a broad head

When You’ll See Them

schedule

Activity pattern Active during the day

brightness_5

Peak hours 10 AM - 4 PM

calendar_month

Season May-July

restaurant

Diet Adults primarily consume nectar and pollen from umbellifers; larvae are predatory, hunting smaller insects under bark.

park

Habitat Woodland edges, hedgerows, parks, and suburban gardens with nearby decaying deciduous wood.

Behavior

Common Cardinal Beetles are most frequently spotted during the late spring and early summer, often found basking on broad-leaved plants or feeding on the nectar of white-flowered shrubs like Hawthorn and Cow Parsley. Despite their flashy appearance, they are somewhat sluggish flyers, preferring to crawl across foliage where their bright scarlet color serves as a warning (aposematism) to birds and other predators that they contain bitter-tasting chemicals.

As adults, they are relatively solitary but may congregate in areas with high nectar availability. While they are often seen in suburban gardens, they are never far from their nursery: decaying wood. The larvae spend up to two years living under the bark of fallen trees, where they are formidable predators of other wood-dwelling insect larvae, including those of bark beetles.

photo_camera EverydayEarth exclusive

Camera Tips

To capture the Common Cardinal Beetle on camera, you need to focus on 'attractor' plants. They are particularly fond of the Apiaceae family—broad, flat, white flower heads like Cow Parsley, Hogweed, or Elderberry. Position your AI-powered camera within 12 to 18 inches of these blooms, ensuring the lens is capable of macro or close-focus shots, as these beetles are relatively small. A sunny, south-facing garden border is the ideal location for high-quality, high-contrast footage of their brilliant red shells.

Because these beetles are sun-seekers, the best time to record them is during the peak heat of the day. Unlike many garden visitors that hide when it gets hot, the Common Cardinal Beetle becomes more active, crawling over the tops of leaves to regulate its temperature. If you have a woodpile or an old stump in your yard, consider placing a secondary camera there; you may catch them emerging from their larval state or searching for mates near the wood where they spent their youth.

For the best visual results, try to angle your camera so it captures the beetle's profile. This allows you to see the distinctive serrated antennae which give the species its scientific name (serraticornis). Use a high frame rate if your device allows, as their takeoff and landing on flowers can be quite sudden. Since they are not attracted to traditional lures like sugar water or fruit, focus entirely on floral placement and natural lighting.

Similar Species

Species that look similar or are commonly confused with Common Cardinal Beetle.

Black-headed Cardinal Beetle

Look at the head color; this species has a jet-black head while the Common Cardinal's is scarlet.

Lily Beetle

Much smaller (6-8mm) with a more rounded, shiny body and a black head and legs; usually found specifically on lily plants.

Scarlet Malachite Beetle

Features metallic green markings on its back, unlike the uniform red elytra of the Cardinal Beetle.

Browse all Insects arrow_forward

Frequently Asked Questions

They are strictly diurnal and most active during the warmest parts of the day, typically between 10 AM and 4 PM, when they can be found sunbathing on leaves or feeding on nectar.

The best way to attract them is to plant white-flowering umbellifers like Cow Parsley or Hawthorn and maintain a 'wild corner' with decaying logs, which provides a home for their predatory larvae.

Adults feed on nectar and pollen from flowers. However, their larvae are carnivores, living under the bark of dead trees and eating other small insects and larvae.

Yes, they are very common in suburban gardens across Western Europe, especially those that are near parks, woodlands, or have a supply of old firewood and logs.

The easiest way is to look at the head. The Common Cardinal Beetle (P. serraticornis) has a bright red head, whereas the Black-headed Cardinal Beetle (P. coccinea) has a distinct jet-black head.

Record Common Cardinal Beetle at your habitat

Connect a camera to start building your own species record — AI identifies every visitor automatically.

Join free Identify a photo