Mayr, 1855 PDF: 383 (diagnosis);
Roger, 1863b PDF: 12 (catalogue);
Mayr, 1863a PDF: 443 (catalogue);
Mayr, 1865: 8 (diagnosis);
Forel, 1878c PDF: 373 (diagnosis); André, 1882b: 162 (Europe & Algeria species);
Cresson, 1887: 255 (U.S.A. catalogue); Dalla Torre, 1893: 214 (catalogue);
Emery, 1925d PDF: 267 (diagnosis, catalogue);
Buren, 1944a PDF: 310 (U.S.A., Iowa species key);
Smith, 1947g PDF: 152 (U.S.A. species key);
Creighton, 1950a PDF: 556 (North America species key);
Chapman & Capco, 1951 PDF: 203 (Asia checklist);
Gregg, 1963: 632 (U.S.A., Colorado species key);
Wheeler & Wheeler, 1963: 274 (U.S.A., North Dakota species key);
Bernard, 1967a PDF: 329 (diagnosis);
Wheeler, 1968 PDF: 156 (Nearctic species, male genitalia);
Smith, 1979: 1466 (North America catalogue);
Wheeler & Wheeler, 1986g PDF: 95 (U.S.A., Nevada species key);
Kupyanskaya, 1990a: 207 (Far Eastern Russia species key);
Agosti, 1994b PDF: 109 (diagnosis, review of genus);
Bolton, 1994: 50 (synoptic classification);
Bolton, 1995a PDF: 1052 (census);
Bolton, 1995b: 342 (catalogue); Kupyanskaya, 1995: 361 (Far Eastern Russia species key);
Mackay & MacKay, 2002 PDF: 359 (U.S.A., New Mexico species key);
Bolton, 2003 PDF: 129 (synopsis).