Derobrachus geminatus is a species of beetle in the family Cerambycidae. For over 100 years, this species was confused with the related species Derobrachus hovorei; essentially all literature prior to 2007 therefore uses the name geminatus for the wrong species, while the true geminatus was known under the junior name Derobrachus forreri.Santos-Silva, Antonio (2007) Revisão do gênero Derobrachus Audinet-Serville, 1832 (Coleoptera, Cerambycidae, Prioninae). Arquivos do Zoologia 38: 1-94. It is an uncommon species but fairly large, reaching 70 mm in length, that can be found from southern Arizona and Texas to Sinaloa and Baja California Sur.Chemsak A.J. (1996) Illustrated revision of the Cerambycidae of North America. Vol. I, Subfamilies Parandrinae, Spondylidinae, Aseminae, Prioninae. Wolfsgarden Press, Burbank, ix+150pp., 10 pls.
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