Some of the several beetle species inhabiting Montana occur seasonally, while a few appear year-round. The mountain pine beetle is a common pest here to pine species like the ponderosa and lodgepole, active between July and August. The state also has a lot of blister beetles mainly dwelling in alfalfa fields, alongcol3 soybean, sugarbeet, and potato plantations.
Beetles in Montana (MT) The pine sawyer beetle , about 2 inches long occupying pine and fir forests, is Montana’s largest beetle.
Biggest Beetles: Pine Sawyer Beetle, Ten-lined June Beetle , Asian Lady Beetle
Smallest Beetles: Black Carpet Beetle , Black Blister Beetle
Most Common Beetles: Mountain Pine Beetle, Black Blister Beetle, Spotted Blister Beetle
Scarab Beetles
Ten-lined June Beetle (Polyphylla decemlineata ) Hairy Flower Scarab Beetle (Trichiotinus assimilis ) Lady Beetles
Convergent Lady Beetle (Hippodamia convergens )Seven-spot Ladybird Beetle (Coccinella septempunctata ) Twice-stabbed Ladybug Beetle (Chilocorus stigma ) Longhorn Beetles
Red-femured Milkweed Borer Beetle (Tetraopes femoratus ) Ponderosa Pine Bark Borer Beetle (Acanthocinus princeps ) Red-shouldered Pine Borer Beetle (Stictoleptura canadensis ) Ponderous Borer Beetle (Trichocnemis spiculatus ) White-spotted Sawyer Beetle (Monochamus scutellatus )Yellow Douglas Fir Borer Beetle (Centrodera spurca ) Yellow Velvet Flower Beetle (Cosmosalia chrysocoma ) Pine Sawyer Beetle (Monochamus galloprovincialis ) California Prionus Beetle (Prionus californicus Asian Long-horned Beetle (Anoplophora glabripennis True Weevils
Knapweed Root Weevil (Cyphocleonus achates ) Elegant Weevil Beetle (Pachyrhinus elegans ) Mountain Pine Beetle (Dendroctonus ponderosae ) Water Scavenger Beetles
Giant Black Water Beetle (Hydrophilus triangular ) Carrion Beetles
Garden Carrion Beetle (Heterosilpha ramosa ) Jewel Beetles
Golden Jewel Beetle (Buprestis aurulenta ) Western Sculptured Pine Borer Beetle (Chalcophora angulicollis ) Leaf Beetles
Net-winged Beetles
Golden Net-wing Beetle (Dictyoptera aurora ) Ground Beetles
Cow Path Tiger Beetle (Cicindela purpurea ) European Ground Beetle (Carabus nemoralis ) Western Tiger Beetle (Cicindela oregona ) Boreal Long-lipped Tiger Beetle (Cicindela longilabris ) Rove Beetles
Gold-and-brown Rove Beetle (Ontholestes cingulatus ) Click Beetles
Western Eyed Click Beetle (Alaus melanops ) Blister Beetles
Ashgray Blister Beetle (Epicauta fabricii ) Spotted Blister Beetle (Epicauta maculata ) Black Blister Beetle (Epicuata pensylvanica ) Dark Blister Beetle (Epicuata murina ) Black Meloe (Meloe niger ) Skin Beetles
Black Carpet Beetle (Attagenus unicolor )
