2 easy ways to identify this genus:
the top of the head is crossbanded, with a dark "tooth" in the middle;
the dark veins near the wing tips look like they have been twisted and tangled.
throughout NA + much of the Old World(2)
some spp. transmit the phytoplasma that caused elm yellows (elm phloem necrosis)
Barnett D.E. (1976) A revision of the Nearctic species of the genus Scaphoideus
(Homoptera: Cicadellidae). Trans. Am. Ent. Soc. 102: 485-593 (Full text