Review of Canadian species of the genera Gnathusa Fenyes, Mniusa Mulsant & Rey and Ocyusa Kraatz (Coleoptera, Staphylinidae, Aleocharinae) Author Klimaszewski, Jan Author Webster, Reginald P. Author Langor, David W. Author Bourdon, Caroline Author Hammond, H. E. James Author Pohl, Greg R. Author Godin, Benoit text ZooKeys 2014 412 9 40 http://dx.doi.org/10.3897/zookeys.412.7282 journal article http://dx.doi.org/10.3897/zookeys.412.7282 1313-2970-412-9 442595E8D2014E59AC9F5FD0AD4580E1 442595E8D2014E59AC9F5FD0AD4580E1 1. Ocyusa canadensis Lohse Figure 8 a-l , Map 4 Ocyusa canadensis Lohse, in Lohse et al. 1990 : 147; Brunke et al. 2012 : 134. Diagnosis. Body length 2.5-3.0 mm, narrowly elongate and broadest at elytra; body colour dark brown to almost black, with tarsi, two basal antennal articles and tibiae rust-brown, rest of antennal articles brown; forebody with dense microsculpture, moderate punctation and pubescence, and strongly glossy; head round and narrower than pronotum; pronotum transverse, rectangular in shape with sides strongly arcuate, and narrower than elytra; elytra at suture about as long as pronotum (Fig. 8a); abdomen broadly arcuate laterally, slightly narrower than elytra and with basal impressions on first three visible tergites; antennae with articles V-X subquadrate to slightly elongate (Fig. 8a). MALE: male tergite VIII broadly rounded apically (Fig. 8c); sternite VIII rounded apically (Fig. 8d); median lobe of aedeagus with tubus strongly bent ventrally and with pronounced structures of internal sac (Fig. 8b). FEMALE: tergite VIII truncate apically (Fig. 8f); sternite VIII rounded apically (Fig. 8g); spermatheca with semi-spherical capsule with long invagination, and S-shaped broad stem (Fig. 8e). Distribution. This native Nearctic species is known from Alaska, Yukon Territory and Ontario ( Brunke et al. 2012 ), and is here newly reported from the island of Newfoundland and New Brunswick [new provincial records] (Map 4). Bionomics. Some adults were collected from June to July at lake margins, on moist soil/gravel among sedges and by treading Carex and grasses. Locality data. CANADA: Newfoundland: George's Lake, Corner Brook, 29.VII.1972, J.M. Campbell (CNC) 1 male; New Brunswick: Restigouche Co., Wild Goose Lake, 419 m elevation, 47.8540°N , 68.3200°W , 21.VII.2010 // lake margin, on moist soil/gravel among sedges, R.P. Webster (RWC) 1 female; same data except: 420 m elevation, 47.8543°N , 68.3219°W , 7.VI.2011 // lake margin with emergent Carex and grasses, treading Carex and grasses, R.P. Webster (RWC) 1 male; same data except 20.VI.2011, (RWC) 2 males, 4 females. Ontario: Timiskaming Distr., 52 km South Armstrong, 27.VI.1973, R. Parry and J.M. Campbell (CNC) 4 females, 7 sex undetermined; 52 km S Armstrong, 27.VI.1973, R. Parry and J.M. Campbell (CNC) 1 female. Yukon Territory: Dempster Hwy., mi. 122, 20.VII.1978, 2000 feet, A. Smetana and J.M. Campbell (CNC) 2 males, holotype and paratype; Dempster Hwy., mi. 147, 1900 feet, 22.VII.1978, J.M. Campbell and A. Smetana (CNC) 1 sex undetermined. UNITED STATES OF AMERICA: Alaska: Prudhoe Bay Rd., Bonanza Creek, 900 feet, 66°40'N , 150°40'W , 2.VII.1978, A. Smetana and J.M. Campbell (CNC) 1 paratype sex undetermined; Nutirwick Creek, 67°55'N , 149°45'W , 2300 feet, 8.VII.1978, J.M. Campbell and A. Smetana (CNC) 2 sex undetermined.