Aeolus trilineatus

The combination of three pale longitudinal stripes on dark elytra, serrate antennae, and the click beetle body form distinguishes A. trilineatus from most similar taxa. It may be confused with other striped elaterids such as some Agriotes species, which typically show more irregular or broken elytral markings rather than continuous longitudinal lines. Examination of antennal structure and precise elytral pattern is necessary for definitive identification.

Adults exhibit the elongated, parallel-sided body form typical of Elateridae. The elytra bear three distinct pale longitudinal lines or stripes against a darker background—two lateral and one median—corresponding to the species name. Antennae are serrate to pectinate. The pronotum is somewhat wider than long, with posterior angles often slightly produced. Size and exact coloration require specimen examination.

Associated with herbaceous vegetation and agricultural settings. Adults occur on foliage of host plants.

North America. Specific range boundaries require further documentation.

Larvae feed on roots of herbaceous plants, including soybean (Glycine max). Adult feeding habits are less documented; has been observed causing feeding damage on leaf surfaces.

• Glycine max - larval food plantsoybean; larval root feeding documented

Complete metamorphosis. Larvae are soil-dwelling wireworms that feed on plant roots. Pupation occurs in soil. Adults are active on vegetation.

Adults display the characteristic clicking/jumping response of Elateridae when disturbed, using the prosternal spine to propel themselves into the air to escape predators or right themselves. Adults have been observed actively feeding on leaf tissue.

Larvae function as root herbivores in agricultural and natural systems, potentially affecting plant health. Adults may contribute to minor herbivory on above-ground plant parts.

Minor agricultural pest. Larval root feeding on soybean can reduce plant vigor. Adult feeding damage on foliage has been documented but is generally of limited economic significance. Not a major target of control measures.

• Agriotes spp.Similar striped elytral patterns, but Agriotes typically exhibits broken or irregular markings rather than three continuous longitudinal lines; antennal structure also differs
• Aeolus mellillusCongeneric species with different elytral pattern; requires careful comparison of stripe configuration and antennal morphology

• Coleoptera
• Elateridae
• click beetle
• agricultural pest
• herbivore
• North America

• BugGuide
• iNaturalist taxon
• ID Challenge #6 | Beetles In The Bush