Scolytine
Guides
Cathartus quadricollis
square-necked warrior beetle
A small predatory flat bark beetle in the family Silvanidae with a broad global distribution spanning the Americas, Africa, and the Galápagos Islands. In Hawaii, it serves as an important natural enemy of agricultural scolytine pests including the coffee berry borer, tropical nut borer, and black twig borer. Laboratory studies confirm it can complete development on various stored grains and seeds. The species shows potential for augmentative biological control programs due to its limited dispersal from release sites and established predation rates on pest eggs.
Conophthorus ponderosae
lodgepole cone beetle, sugar pinecone beetle, ponderosa pine cone beetle
Conophthorus ponderosae is a scolytine bark beetle in the family Curculionidae that specializes in attacking the cones of pine trees, particularly Pinus ponderosa (ponderosa pine) and Pinus monticola (western white pine). The species is known as a significant pest in seed orchards and natural stands, where heavy infestations can severely reduce seed production. Research has documented its response to host monoterpenes including myrcene, which exhibits both repellency and toxicity effects, and its sex pheromone system involving pityol compounds. The species occurs across western North America and has been the focus of semiochemical-based management research due to the difficulty of conventional insecticide applications in some habitats.
Hypothenemus exiguus
Hypothenemus exiguus is a species of small bark beetle in the family Curculionidae. The species was originally described as Trischidias exigua by Wood in 1986 and is currently recognized as a synonym under the genus Hypothenemus. It has been recorded from Middle America and North America, including the conterminous 48 United States. Little specific information is available regarding its biology or ecology compared to better-known congeners such as the coffee berry borer (H. hampei).
Ips avulsus
Small Southern Pine Engraver
Ips avulsus, the small southern pine engraver, is a bark beetle in the family Curculionidae. It colonizes pine hosts, primarily attacking the lower bole of stressed or damaged trees. The species uses a pheromone blend of ipsdienol and lanierone for aggregation, with responses to semiochemicals influenced by context and spatial arrangement. It cohabits trees with other Ips species and Dendroctonus frontalis, showing differential attack height partitioning.
Orthotomicus latidens
Wide-toothed Bark Weevil
Orthotomicus latidens is a bark beetle species in the weevil family Curculionidae, subfamily Scolytinae. The species was described in 2001 and is known from North and Middle America. Like other scolytines, it is associated with wood-boring habits, though specific ecological details remain limited in published literature.
Pityogenes fossifrons
Pityogenes fossifrons is a species of bark beetle in the weevil family Curculionidae, described by Wood & Bright in 1992. It belongs to the genus Pityogenes, a group of small scolytine beetles that colonize coniferous trees. The species is known from western North America, with confirmed records from British Columbia, Canada. Like other members of its genus, it likely functions as a primary or secondary bark beetle associated with pine hosts.