Mayr, 1863a: 456 (catalogue); Mayr, 1865: 23 (diagnosis); Emery, 1882a: 279 (Europe & Algeria species); Dalla Torre, 1893: 63 (catalogue); Emery, 1924f: 265 (diagnosis, catalogue); Creighton, 1950a: 284 (North America species key); Bernard, 1967a: 223 (diagnosis); Smith, 1979: 1398 (North America catalogue); Radchenko, 1994b: 112 (South Siberia species key); Bolton, 1995a: 1049 (census); Bolton, 1995b: 211 (catalogue); Xu, 2012a: 21 (all species key); Cantone, 2017: 202 (brief male diagnosis)
Extant: 3 valid species, 1 valid subspecies
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