Crickerson 1937 Ephyraeius v. nuchalis Bates Well, Pima Co., Ariz. Feb. 3, 1937. Individual seen and heard several times during days here; work of one found on branch of mesquite tree; branch 4 inches in diameter, holes encircling branch about 6 ft. above ground; some old squared in slope, others freshly made round; flies attracted by sap first drew my attention to work.