Common Eastern Firefly

Photinus pyralis, also known by the common names the common eastern firefly or big dipper firefly, and sometimes called a "lightning bug", is a species of flying beetle. An organ on its abdomen is responsible for its light production. It is the most common species of firefly in North America and is typically found east of the Rocky Mountains. Photinus fireflies are often confused with fireflies of the similar-sounding genus, Photuris, which are also found in North America. Scientific Name: Photinus pyralis Range: Eastern & central United States Size: 10–14 mm Status: Common ID Notes: Brown elytra with pale margins. Pronotum has pink edge and black center. Light organ on segments 6–7 of abdomen. Behavior / Notes: Males flash a distinct 'J-stroke' pattern as they fly at dusk. Females reply from grass. The most common firefly seen in eastern U.S. gardens.