Red-Shouldered Bug Identification Guide

Key Features

• Slender, elongated-oval body about 11-14mm long
• Black to dark gray overall coloring with a bright red-orange band across the "shoulders" - the front edge of the pronotum
• Red-orange coloring may also outline portions of the wing margins, but is concentrated near the head rather than running the full body length
• Bright red eyes
• Long, thin black legs and antennae
• Wings lie flat over the back, giving a slightly tapered look toward the abdomen tip

Where and When to Look

• Strongly associated with soapberry-family trees, especially goldenrain tree and balloon vine, where it feeds on seeds
• Most abundant in warm regions, particularly the southern and southwestern United States
• Adults are active from spring through fall and often form dense aggregations on tree trunks, seed pods, sidewalks, and building exteriors near host trees
• Populations can spike dramatically wherever goldenrain trees have been planted as ornamentals

Similar-Looking Bugs

• Boxelder bugs are close relatives with a similar black body plan, but their red-orange markings form three stripes running the length of the body rather than being concentrated at the shoulders
• Elm seed bugs are smaller and have thinner red-orange edging, and are tied to elm trees rather than soapberry-family plants
• Other seed bugs in the same family can look similar; checking the host plant and the exact placement of red markings (shoulder band vs. full stripes) helps separate them

Quick ID Checklist

• Black body with a red-orange band across the pronotum "shoulders"
• Bright red eyes
• Found on or near goldenrain trees, balloon vine, or other soapberry-family plants
• Large clustering groups in warm months, especially on seed pods and pavement below host trees
• Red markings concentrated near the head rather than running full-length stripes