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Genus Xylotrechus

which species? - Xylotrechus aceris Arrowhead Borer? - Xylotrechus sagittatus Rustic Borer - Xylotrechus colonus Beetle - Xylotrechus colonus Rustic Borer - Xylotrechus colonus Arrowhead Borer - Xylotrechus sagittatus Longhorn ? - Xylotrechus insignis Mating Xylotrechus  - Xylotrechus nauticus - male - female
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga (Water, Rove, Scarab, Longhorn, Leaf and Snout Beetles)
Superfamily Chrysomeloidea (Long-horned and Leaf Beetles)
Family Cerambycidae (Longhorned Beetles)
Subfamily Cerambycinae
Tribe Clytini
Genus Xylotrechus
Explanation of Names
Author of genus is Chevrolat, 1860. (Louis Alexandre Auguste Chevrolat, French, 1799-1884) Xylotrechus means "wood runner". (1)
Numbers
Size
8-25 mm
Identification
Medium-sized Longhorn Beetles, with rather short antennae, usually.

Quoting BugGuide member and coleopterist Guy Hanley: The genus Xylotrechus has two ridges or "carina" on the front of the head, sometimes converging, forming a sort of "Y" shape. See photo of X. sagittatus:

Print References
Taber (1)
Dillon (2)
Yanega (3)
Internet References
Mike Quinn found this beautiful page of images!
Insects of Cedar Creek--X. colonus, X. undulatus.
North Carolina State University Entomology Collection lists for that state, with number pinned: colonus (158), sagittatus (76)