Tetraopes femoratus

Definition

A species of longhorn beetle (family Cerambycidae) native to Mexico and the United States, first described by John Lawrence LeConte in 1847. Like other members of the genus Tetraopes, adults are typically associated with milkweeds (Asclepias), where larvae bore into roots and stems. The species exhibits considerable geographic variation, with several named infraspecific forms (e.g., var. oregonensis, var. basalis, var. amnicola, var. monticola) historically treated as varieties or subspecies based on differences in coloration, elytral pattern, and body proportions across western, southwestern, and Rocky Mountain populations.

Etymology

Femoratus refers to the femora (thighs), likely alluding to a distinctive feature of the hind legs in this species.

Example

Specimens of Tetraopes femoratus from the Pacific Northwest (historically called var. oregonensis) often display reduced red markings compared to nominate populations from the Southwest, illustrating the clinal variation that complicates subspecies boundaries in milkweed-associated cerambycids.

Synonyms

• Tetraopes femoratus var. oregonensis
• Tetraopes femoratus var. basalis
• Tetraopes femoratus var. amnicola
• Tetraopes femoratus var. monticola

Related Terms

• Tetraopes
• Cerambycidae
• longhorn beetle
• Milkweed beetle
• LeConte
• infraspecific name
• clinal variation

Usage Notes

The numerous named varieties reflect 19th- and early 20th-century taxonomic practice; modern treatments may synonymize these under the nominate form or recognize them as subspecies depending on the authority. The genus Tetraopes is part of the Tetraopini, a tribe of milkweed specialists; species identification requires careful examination of antennal proportions, elytral maculation, and male genitalia.