Trichodes

Trichodes species are among the largest clerid beetles and exhibit bold, contrasting color patterns typically combining black with orange, red, or yellow markings. The genus can be distinguished from other Cleridae by its relatively large size and frequent association with flowers. North American species are primarily western in distribution, with T. nuttalli and T. apivorus occurring in the eastern United States. T. bibalteatus is characterized by distinct transverse bands across the elytra.

Adults are commonly found on flowers of herbaceous plants, particularly yellow composites (Asteraceae) and other native wildflowers. Larval habitat is restricted to the nests of bees and wasps. In North America, species occur in diverse habitats including prairie grasslands, rocky exposures, and pine woodlands.

Predominantly Holarctic in distribution. In North America, 11 species occur primarily in western regions, with two species (T. nuttalli and T. apivorus) extending into the eastern United States. Specific collection records include Oklahoma (Wichita Mountains, Gloss Mountains), Colorado, and Arkansas.

Adults have been observed in early July in Oklahoma and during summer months in Colorado. Activity appears to peak during the flowering season of associated host plants.

Adults feed on pollen and nectar of flowers. Larvae are obligate predators of immature bees and wasps (eggs, larvae, and pupae) within host nests, and also consume pollen provisions stored by the hosts.

• bees (Hymenoptera: Apoidea) - larval host/preyLarvae attach to adult bees visiting flowers, hitchhike to nests, and prey on brood
• wasps (Hymenoptera: Vespoidea) - larval host/preySame phoretic mechanism as with bees; larvae prey on developing wasp brood

Females lay eggs on flowers. Upon hatching, larvae attach themselves to visiting bees or wasps and are transported to the host's nest. Larvae then prey on the host's immature stages and consume stored provisions. Development occurs entirely within the host nest.

Adults serve as pollinators while foraging on flowers. Larvae exhibit phoretic behavior, actively attaching to hymenopteran visitors to gain transport to host nests. This represents an evolutionary strategy combining pollination mutualism with brood parasitism.

Adults function as pollinators of native plant species. Larvae act as specialized predators that regulate populations of bees and wasps. The genus occupies a unique ecological position linking floral resources with hymenopteran nest communities.

No direct economic importance established. May incidentally affect populations of beneficial pollinators through larval predation. Adults are subjects of ecological and behavioral research due to their distinctive life history.

• EnoclerusBoth are genera of Cleridae with bright coloration, but Enoclerus species are generally smaller, more commonly associated with dead wood and bark beetles rather than flowers, and lack the specialized larval transport behavior on hymenopterans.
• ClerusEuropean genus of similar large, colorful clerids; distinguished by distribution and subtle morphological differences in antennal structure and elytral sculpture.

• Cleridae
• checkered beetles
• pollinators
• brood parasites
• hymenopteran predators
• phoresy
• flower visitors
• Holarctic

• BugGuide
• Wikipedia
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Cleridae | Beetles In The Bush | Page 2
• 2019 Arkansas/Oklahoma Insect Collecting Trip iReport | Beetles In The Bush
• Sunset beetles | Beetles In The Bush
• Observations on the Life History of Trichodes Ornatus (Coleoptera, Cleridae), a Larval Predator in the Nests of Bees and Wasps