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Butterflies of North America -- Calephelis nilus

North American Butterflies and Moths List

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U.S. Geological Survey


Butterflies of North America

Rounded Metalmark (Calephelis nilus)
JPG -- species photo

Rounded Metalmark (Calephelis nilus). Subspecies arizonensis and freemani were formerly considered distinct species.

Wing span: 11/16 - 15/16 inch (1.8 - 2.4 cm).

Identification: Male with tip of forewing rounded. Upperside brown with indistinctly checkered fringes; may have dark median band.

Life history: Eggs are laid singly in axils of host plant leaves. Caterpillars eat leaves.

Flight: Throughout the year in South Texas, although most common from March-November.

Caterpillar hosts: Boneset (Eupatorium odoratum) in the sunflower family (Asteraceae).

Adult food: Flower nectar including boneset.

Habitat: Open areas such as thorn scrub, road edges, and fencerows.

Range: Central Texas south to central Mexico.

Conservation: Habitats in the lower Rio Grande Valley should be protected and conserved.

The Nature Conservancy Global Rank: G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.

Management needs: None reported.

References:

Opler, P. A. and V. Malikul. 1992. A field guide to eastern  butterflies. Peterson 
    field guide #4. Houghton-Mifflin Co.,  Boston. 396 pages, 48 color plates.

Scott, J. A. 1986. The butterflies of North America. Stanford  University Press, 
    Stanford, Calif. 583 pages, 64 color plates.

Author: Jane M. Struttmann

South Texas populations are ssp perditalis

Rounded Metalmark (Calephelis nilus)
distribution map
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