Published online by Cambridge University Press: 31 May 2012
Hab.—Beulah, N.M., alt. 8,000 ft., very abudant on Rudbeckia ampla, A. Nelson. It is preyed upon by Hippodamia convergens. This species is easily known by its bright scarlet colour. Monell reports N. rudbeckia from many genera of Compositæ at St. Louis, Mo.; in New Mexico I have found it only on one species of Rudbeckia; even the species on Rudbeckia hirta is quite different.