Codatractus alcaeus

The White-crescent Longtail is distinguished from similar longtail skippers by the combination of: (1) white crescent-shaped forewing markings rather than continuous bands or spots, (2) relatively unmarked dark hindwing upperside with only small pale marginal spots, and (3) tail length intermediate between very long-tailed species (Urbanus) and short-tailed relatives. Separated from Codatractus arizonensis by more extensive white markings and more southerly distribution.

Medium-sized skipper with elongated hindwing tails typical of the 'longtail' group. Upper wing surface dark brown to blackish with distinct white crescent-shaped or triangular markings, particularly on the forewing. Hindwing has pale marginal spots. Underside generally paler brown with more extensive light markings. Body stout with large eyes, antennae with hooked clubs.

Tropical and subtropical habitats including forest edges, second growth, and disturbed areas with host plants. Found from lowland to middle elevations.

Ranges from Mexico through Central America to Panama. Present in both Middle America and southern North America (Mexico). Distribution records indicate presence across the Mesoamerican land bridge.

Rapid, erratic flight typical of skippers. Adults perch with wings partially open, hindwings flat and forewings held at angle.

Adults likely function as pollinators; larvae are herbivores feeding on leguminous host plants.

• Codatractus arizonensisOverlaps in Mexico but has reduced white markings and more northerly range extension into Arizona
• Urbanus speciesSimilar long-tailed appearance but typically have longer, more slender tails and different wing pattern elements
• Chioides speciesShare long-tailed morphology but have different white marking patterns and often more extensive pale areas

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life