Roger, 1863b PDF: 14 (catalogue);
Mayr, 1863a PDF: 427 (catalogue);
Mayr, 1865: 9 (diagnosis);
Forel, 1878c PDF: 383 (diagnosis); André, 1882b: 220 (Europe & Algeria species);
Cresson, 1887: 258 (U.S.A. catalogue); Dalla Torre, 1893: 162 (catalogue);
Bingham, 1903 PDF: 289 (diagnosis);
Wheeler, 1905h PDF: 322 (North America species);
Emery, 1913a PDF: 19 (diagnosis, catalogue);
Creighton, 1950a PDF: 338 (North America species key);
Chapman & Capco, 1951 PDF: 192 (Asia checklist);
Gregg, 1963: 438 (U.S.A., Colorado species key);
Bernard, 1967a PDF: 253 (diagnosis);
Smith, 1979: 1417 (North America catalogue);
Wheeler & Wheeler, 1986g PDF: 55 (U.S.A., Nevada species key);
Shattuck, 1992c PDF: 121 (diagnosis, review of genus);
Shattuck, 1994 PDF: 128 (catalogue);
Bolton, 1995a PDF: 1050 (census);
Bolton, 1995b: 247 (catalogue);
Mackay & MacKay, 2002 PDF: 232 (U.S.A., New Mexico species key);
Del Toro, Pacheco & MacKay, 2009 PDF: 306 (all species revision, key).