Alaus melanops

Distinguished from eastern A. oculatus by geographic range and slightly smaller eyespots with less stark white surrounding rings. Separated from A. myops by larger, more prominent eyespots and western distribution (ranges do not overlap). Differs from southwestern A. zunianus and A. lusciosus by less robust body form and more angular rather than rounded eyespot shape. The clicking sound produced when handled is diagnostic for family Elateridae.

Large, bullet-shaped beetle with mottled black and white coloration providing bark-matching camouflage. Most prominent feature is the pair of large false eyespots on the pronotum: black pubescent patches each surrounded by a narrow white ring. True compound eyes are small and located on the head anterior to the antennae bases. Body covered in soft setae that contribute to cryptic patterning. Adults measure 20–35 mm in length. Similar to A. myops (Blind Click Beetle) but with larger, more distinct eyespots and non-overlapping geographic range.

Associated with coniferous forests, particularly pine woodlands. Adults found on logs, stumps, and tree trunks. Larvae inhabit decaying wood beneath bark of fallen or dying trees.

Western North America: British Columbia, Oregon, Colorado, California, and New Mexico. Records from Kaibab National Forest, Arizona (ponderosa pine zone, ~7000 ft elevation) and Spring Mountains, Nevada.

Adults active during day and at dusk. Peak activity in late spring through June and July. Some adults may overwinter in cavities in rotten wood and be encountered year-round.

Larvae are predatory, feeding on larvae and pupae of other beetles in decaying wood. Adult diet not well documented; possibly feeds on fermenting sap or associated with freshly cut or downed trees.

• Pinus ponderosa - habitat/larval substrateadults found on dead/dying trees; larvae under bark
• Juniperus osteosperma - habitat/larval substrateadults found on trunks at night
• Pinus monophylla - habitat/larval substrateadults found on fallen branches at night

Complete metamorphosis. Larvae are large, elongate 'wireworms' with powerful mandibles, inhabiting decaying wood where they prey on other insect larvae. Pupation occurs in wood. Adults emerge and may be found on bark surfaces.

Exhibits thanatosis (death-feigning) when disturbed, lying motionless with legs and antennae appressed. When grasped, produces loud audible click by snapping prosternal spine into mesosternal groove, generating force sufficient to launch beetle several inches vertically. Cannot moderate click force; jumps maximize height to ensure sufficient clearance even from soft substrates. Tumbling during jump results in approximately 50% probability of landing upright; multiple attempts may be required. Primarily nocturnal in activity patterns based on field observations.

Predator as larvae, regulating populations of other wood-inhabiting beetles. Contributes to nutrient cycling in forest ecosystems through association with decaying wood. Serves as prey for birds, reptiles, and other insectivores; eyespots function in predator deterrence through startle response.

Harmless to humans; poses no health risk. Occasionally encountered by homeowners, hikers, and field biologists. Larvae sometimes found during firewood processing or tree removal. Subject of biomechanical research on jumping mechanics.

• Alaus oculatusEastern counterpart with larger, more prominent eyespots; ranges do not overlap
• Alaus myopsSimilar mottled gray coloration but with much smaller, reduced eyespots; pine-associated but eastern/midwestern distribution
• Alaus zunianusSouthwestern species with rounder eyespots and more robust, ivory-mottled body
• Alaus lusciosusNearly identical to A. zunianus but with Texas to southern Colorado distribution

False eyespots are sometimes mistaken for actual eyes; true eyes are much smaller and located on the head. Clicking mechanism was formerly assumed to be primarily for self-righting, but biomechanical evidence suggests it evolved primarily for predator escape with self-righting as secondary benefit.

• click beetle
• eyed elater
• predatory larvae
• woodland beetle
• defensive mimicry
• biomechanics

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• Bug Eric: Eyed Elaters
• Chrysididae | Beetles In The Bush
• Barking up the right tree for the eyed elater, Alaus oculatus — Bug of the Week
• Pop! goes the beetle | Beetles In The Bush