North American Butterflies and Moths List

The definitive website on wildbirds & nature

The Registry of Nature Habitats

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.


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
map legend

Return to species list
Return to Butterflies of North America main page