Agathymus neumoegeni

Distinguished from similar giant-skippers by broader orange bands and more abundant orange coloration compared to Agathymus aryxna (Arizona giant-skipper), which has narrower bands and white-and-black checked fringes. The orange giant-skipper's fringes are black. Sexual dimorphism in spot patterns on forewings aids identification.

Large skipper with wingspan 44.5–60.3 mm. Upperside orange to yellowish-orange with black margins and black patches. Underside of hindwings dark gray with pale shaded band and two indistinct white spots along upper boundaries. Sexual dimorphism present: males have orange spots forming band on forewing and hindwing, with spot seven overlapping interior edge of spot six on forewing; females have thicker orange band and pointed inner end of spot nine on forewing. Fringes black (not white-and-black checked). Rests with forewings open at 45-degree angle, hindwings horizontal. Caterpillar greenish or bluish-white with dark brown head.

Dry grasslands and open woodlands, often near mesas and mountains at elevations of 2165–2790 meters. Associated with agave stands, including within Carlsbad Caverns National Park, New Mexico.

Southwestern United States: central Arizona, Texas, and New Mexico. Range extends into northern Mexico.

Adults fly once annually in September and October. Eggs laid in spring; caterpillars active in spring, then dormant through summer.

Caterpillars feed on pulp and sap of Parry's agave (Agave parryi). Young caterpillars consume leaf pulp before hibernation; older larvae feed on sap from leaf bases. Adult males feed on moisture from mud or manure. Adult females do not feed.

• Agave parryi - caterpillar host plantParry's agave; eggs laid on or near plant, caterpillars bore into leaves to feed on pulp and sap

Univoltine. Female lays 80–150 pale yellow eggs individually on or near host plant; eggs fall to base of plant and hatch in 18–19 days, turning deep red and orange before hatching. Young caterpillar crawls to leaf tip and burrows inside to feed on pulp, then hibernates. In spring, caterpillar makes new burrow in leaf base, feeds on sap, then becomes inactive for summer. Before pupation, caterpillar expands burrow opening and constructs silk trap door. Pupates within cocoon of leaves and silken threads. Adult emerges through trap door. Female lifespan less than one week.

Males perch near host plants from early morning until noon to await receptive females. Adults exhibit rapid, direct, vigorous flight typical of skippers. Males engage in mud-puddling at moist soil or manure. Adults are difficult to locate; caterpillars are more readily found within host plants.

Larval herbivore specialized on agave species. Caterpillar boring behavior creates entry points that may facilitate other organisms. Adults may serve as pollinators though this has not been documented.

Subject of interest to lepidopterists due to restricted range and specialized life history. Observed in Carlsbad Caverns National Park, contributing to regional biodiversity documentation. No known economic importance.

• Agathymus aryxnaArizona giant-skipper shares similar post-median bands and general coloration, but has narrower orange bands, less abundant orange coloration, and white-and-black checked wing fringes versus black fringes in A. neumoegeni

• skipper
• giant-skipper
• agave specialist
• univoltine
• montane
• southwestern US
• sexual dimorphism
• mud-puddling
• leaf-mining caterpillar

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