Strophiona Casey, 1913

Strophiona Casey, 1913:248
    laeta (LeConte, 1857:64)
        ostenta Casey, 1913:265
    tigrina Casey, 1913:266
        reducta Casey, 1913:266

Strophiona is thought to consist of three species, all in North America. One species, S. nitens is found throughout eastern North America while two species are described as living in sympatry for the majority of their ranges on the west coast, from British Columbia to Mexico (Linsley and Chemsak, 1972). Strophiona is easily confused with species in the genus Typocerus, ​which have similar elytral patterning.  Typocerus however is separated by having the base of the pronotum broad and unconstricted, and antennal segments expanded apically, and baring extensive poriferous areas on the outer antennal segments. 

Both genera are closely allied to Lepturobosca (Cosmosalia) in overall body form and, like Lepturobosca, exhibit long golden pubescence on their heads, abdomens and pronota. All genera have truncate posterior elytral apices. In Cosmosalia the apices are somewhat rounded, while in Strophiona and Typocerus the lateral angles of the apices are produced outward and pointed.

References

1. Casey, T. L. 1913. Further studies amongst the American Longicornia. Memoirs on the Coleoptera, 4:193-388. <Link to Biodiversity Heritage Library> <PDF>
2. LeConte, J. L. 1857. Report upon Insects collected on the survey. In, Report of Explorations and Surveys to ascertain the most practicable and economical route for a railroad from the Mississippi river to the Pacific Ocean. Made under the Direction of the Secretary of War, in 1853-5, according to Acts of Congress of March 3, 1853, May 31, 1854 and August 5, 1854, 12:1-72, 2 pls. <Making of America Books> <p. 64>