Catalogue of Geadephaga (Coleoptera, Adephaga) of America, north of Mexico Author Bousquet, Yves Agriculture and Agri-Food Canada, Central Experimental Farm, Ottawa, Ontario, Canada bousquety1@yahoo.com text ZooKeys 2012 2012-11-28 245 1 1722 http://dx.doi.org/10.3897/zookeys.245.3416 journal article http://dx.doi.org/10.3897/zookeys.245.3416 1313-2970-245-1 FFFF52503A0AFF882450FFB66D45FF8E 578462 Subgenus Phymatocephalus Schaum, 1864 Phymatocephalus Schaum, 1864: 125. Type species: Phymatocephalus riehlii Schaum, 1864 (= Melanotus erro LeConte, 1854) by monotypy. Etymology. From the Greek phymatos (tumor, growth) and cephale (head), alluding to the big head (" caput crassum ") of the adult [masculine]. Diversity. Two species in southern North America and Mexico.