Madarellus undulatus

Distinguished from other small weevils by the combination of brown head with black or reddish body, glossy and somewhat punctate prothorax, and striate elytra. The specific epithet 'undulatus' refers to the wavy appearance, likely of the elytral striae or overall body contour. Similar species in the genus Madarellus and related Baridinae would require examination of genitalia or other fine structural details for definitive separation.

Small weevil measuring 2.8–4.5 mm in length. Head is brown in color. Body is black or sometimes reddish. Prothorax is glossy and somewhat punctate. Elytra are striate (marked with fine longitudinal grooves or lines).

Occurs throughout the United States and in Canada (Ontario and Quebec). GBIF records also indicate presence in Nova Scotia and Vermont.

Larvae feed on poison ivy (Toxicodendron radicans) and Virginia creeper (Parthenocissus quinquefolia). Adult feeding habits are not documented.

• Toxicodendron radicans - larval food plantpoison ivy
• Parthenocissus quinquefolia - larval food plantVirginia creeper

• Other Madarellus speciesSame genus, require detailed examination for separation
• Other Baridinae weevilsSimilar small size and general weevil morphology, distinguished by specific color pattern and striate elytra

• weevil
• Curculionidae
• Baridinae
• North America
• leaf-feeding larvae

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Wyoming Distribution Atlas
• Grasshopper Collections and Survey
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