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 Platypatrobus lacustris Darlington, 1938 Platypatrobus lacustris Darlington, 1938: 146. Type locality: "Ba[t]ch[a]w[a]n[a](g) B[ay] [north of Sault Sainte Marie, Ontario], Lake Superior" (original citation). Holotype (♀) in MCZ [# 21781]. Distribution. This species ranges from New Brunswick to Great Slave Lake in Northwest Territories, south to the foothills of the Rocky Mountains in southern Alberta, northeastern Minnesota (Gandhi et al. 2005: 926), northeastern Ohio (Ashtabula and Trumbull Counties, Harry J. Lee, Jr. pers. comm. 2008), northeastern Pennsylvania (Pike County, CMNH), and Connecticut (Krinsky and Oliver 2004: 396) [see Bousquet 1987a: map 2]. Records. CAN : AB, MB, NB, NT, ON, QC, SK USA : CT, ME, MN, NH, OH, PA, VT Figure 25. Platypatrobus lacustris Darlington. Described in 1938, this species remained a great rarity for more than 20 years. The few specimens known had all been captured at light. Henri Goulet, then a summer student working at the Biosystematics Research Centre in Ottawa (now part of the Eastern Cereal and Oilseed Research Centre), found out that a mite of the genus Protodinychus , members of which occurred commonly in beaver houses, had been found on one of the specimens of Patrobus lacustris . Armed with this information, Goulet visited an abandoned beaver house in Gatineau Park in southwestern Quebec and found more than 50 specimens of Platypatrobus . The habitat requirements of the species were discovered: Platypatrobus lacustris lives in the walls of active or recently deserted beaver houses.