Brochymena cariosa

Stål, 1872

Brochymena cariosa is a native North American in the Pentatomidae. Like other members of the Brochymena, it is a rough or tree stink bug with cryptic coloration resembling lichen-mottled bark. The is arboreal and overwinters as an , typically remaining outdoors under loose bark rather than entering structures.

Pronunciation

How to pronounce Brochymena cariosa: /ˌbrɒkɪˈmiːnə kæriˈoʊsə/

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Identification

Brochymena cariosa can be distinguished from the brown marmorated stink bug (Halyomorpha halys) by two key characters: lack white bands on the last two segments, and the leading edge of the pronotum has fine teeth. The body is gray with black and white or ivory speckling, providing camouflage against tree bark. range 10–19 mm in body length. -level identification within Brochymena requires microscopic examination of dead specimens.

Habitat

Arboreal; associated with trees and shrubs. Overwinters as beneath loose bark or in other sheltered outdoor locations. Not known to aggregate on buildings or enter homes in significant numbers.

Distribution

North America. Specific range details beyond the continent are not documented.

Seasonality

Active in spring and fall when emerging from and entering hibernation. may be seen on warm, sunny winter days. One per year in temperate climates.

Life Cycle

laid in small clusters on twigs of trees. Nymphs progress through four instars before reaching adulthood. Development from egg to is lengthy, resulting in a single in temperate regions.

Ecological Role

Suspected to feed on sap of trees and shrubs. Occasional on other insects has been reported but not confirmed. Serves as prey for sand wasps (Bicyrtes quadrifasciata), birds, fence lizards, and parasitic tachinid flies (Trichopoda spp.). are parasitized by platygastrid (Trissolcus brochymenae, Telenomus spp.) and eupelmid wasps (Anastatus reduvii).

Human Relevance

Not a pest . Does not invade homes in large numbers like the brown marmorated stink bug. Occasionally brought indoors with firewood.

Similar Taxa

  • Brochymena quadripustulataFour-humped stink bug with similar cryptic appearance and arboreal habits; distinguished by specific hump-like projections on the back.
  • Halyomorpha halys brown marmorated stink bug; distinguished by white-banded and lack of teeth on pronotum leading edge.
  • Other Brochymena speciesApproximately 21–23 in North America north of Mexico; require microscopic examination for reliable species-level identification.

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