“…Genuslevel identifications were done using the Bee Genera IDnature guide from DiscoverLife.org (Ascher and Pickering 2011) and The Bee Genera of North and Central America (Michener et al 1994). Species-level identification was done using published literature (Sandhouse 1924, Michener 1938, Michener 1939, Michener 1947, Hurd and Linsley 1951, Timberlake 1952, Stephen 1954, Timberlake 1954, Hurd and Michener 1955, Snelling 1966, LaBerge 1967, LaBerge 1969, Roberts 1972, Daly 1973, McGinley 1986, LaBerge 1986, Michener et al 1994, Michener 2000, Sipes 2002, Rightmyer 2008, Gibbs 2010, Rightmyer et al 2010, Sheffield et al 2011 For those genera or subgenera where taxonomic information was lacking, we classified bees with similar morphological distinctions into morphospecies. Each morphospecies is classified by the genus (and subgenus if determined) followed by a unique three-digit number.…”