A synoptic review of the ants of California (Hymenoptera: Formicidae). Author Ward, P. S. text Zootaxa 2005 936 1 68 http://antbase.org/ants/publications/21008/21008.pdf journal article 21008 Proceratium californicum Cook 1953 E1 [endemic to California], E2 [endemic to California floristic province (Hickman, 1993)]