Stenus (Nestus) caseyi Puthz, 1972 (Fig. 5F) Stenus (Nestus) caseyi Puthz, 1972b: 172. Stenus caseyi – Puthz 1975b: 125. Stenus (s. str.) caseyi – Campbell & Davies 1991: 110. Material examined Holotype ♂, ‘[USA] Michigan’, ‘ ♂ | Holotype’, ‘ Stenus | caseyi | n. sp. | det. V. Puthz 1971’ (MNHG). USA: 1 ♂, 4 ♀♀, Mich. Berrien Co., 2 mi. N. New Buffalo, Gallien R. W bank, 2 Nov. 1980, litter in marsh, L.E. Watrous leg. (FMNH); 4 ♂♂, 1 ♀, Wisconsin, Kenosha Co., Carol Beach, Chiwaukee Prairie, 24 Oct. 1980, FMHD #80-35 litter in wet grassy pockets, L. Watrous & W. Suter leg. (FMNH); 2 ♂♂, 1 ♀, same locality, 1 May 1980, FMHD #80-3162, rhizomes, grasses at ditch, W.S. Suter leg. (FMNH); 2 ♀♀, same locality, 19 Mar. 1974, W. Suter leg., FM(HD)#74-49, Ber.: litter in semi-dry ditch, WS#74-22b (FMNH); 1 ♀, same locality, 4 Jun. 1974, W. Suter leg., FM(HD)#74-163, Ber.: Marsh floor at grass hummocks, WS#74-44a (FMNH); 2 ♂♂, 1 ♀, same locality, 10 May 1975, W. Suter leg., FM(HD)#75-189, Ber.: grassy moss clumps marsh area (FMNH); 1 ♂, same locality, 26 Apr. 1974, W. Suter leg., FM(HD)#74-66, Ber.: floor at cattails, WS#74-30D (FMNH); 1 ♂, same locality, 26 Apr. 1974, W. Suter leg., FM(HD)#74-65, Ber.: sandy soil at water table, WS#74-30C (FMNH); 1 ♀, same locality, 11 Sep. 1976, W. Suter leg., FM(HD)#76-160, WS#76-65b, temporary pond, floor peat (FMNH). Remarks The species was originally described from Michigan, USA, has subsequently been reported from Quebec, Canada (Puthz 1975b) and also cited for the Canadian provinces Ontario, Quebec, New Brunswick and Nova Scotia (Campbell & Davies 1991) without citing material. The new data above widen the range to include Wisconsin. Since the genital preparation of the holotype had been somewhat deformed owing to excessively quick dehydration, the figure of the aedeagus in the original description was not quite adequate. Based on the available material, I herein provide a new figure for this structure (see Fig. 5F).

Published as part of Ryvkin, Alexandr B., 2012, New species and records of Stenus (Nestus) of the canaliculatus group, with the erection of a new species group (Insecta: Coleoptera: Staphylinidae: Steninae), pp. 1-62 in European Journal of Taxonomy 13 on page 18, DOI: 10.5852/ejt.2012.13, http://zenodo.org/record/3857775