Bembidion nigrivestis Bousquet

Bousquet, Yves & Webster, Reginald, 2006, Descriptions of three new species of Bembidion Latreille (Coleoptera: Carabidae) occurring in Canada, Zootaxa 1297, pp. 23-35 : 24-27

Bembidion nigrivestis Bousquet , sp. nov.

( Figs. 1 , 3 )

Etymology. The specific name is the combination of the Latin adjective niger, ­ gra, ­ grum (black) and the Latin noun vestis, ­is, f (clothes, clothing), referring to the blackish color of the species integument.

Type material. Holotype (ɗ) in CNC labelled: " Canada Quebec (Stanstead) Sainte­ Catherine­de­Hatley 3.VI.1992, Y. Bousquet / Holotype Bembidion nigrivestis Bousquet CNC No. 23455."

Paratypes from the following localities. Canada. NEW BRUNSWICK. Kouchibouguac National Park, 21.IX.1977, J.M. Campbell (8ɗɗ, 9ΨΨ, CNC). 5.3 km SW jct. Hwy 101 & Charters Settlement Rd., York Co., 4.V.2000, 8.V.2000, R.P. Webster (4ɗɗ, RWC) [under alders in moss and litter along margin of small brook]. QUEBEC. Gatineau Park, 1.VI.1979, A. Smetana (1Ψ, CNC). Gatineau Park, Notch Rd., 30.X.1982, A. Smetana (3ɗɗ, 3ΨΨ, CNC). Gatineau Park, Lac Bourgeois, 24.IX.1982, A. Davies (1Ψ, CNC) [sift moss]. Gatineau Park, Ramsey Lake area, 6.VI.1971, 12.IX.1976, J.M. Campbell (4ΨΨ, CNC). Rigaud, 5.V.1988, A.& Z. Smetana (1ɗ, 1Ψ, CNC). Ormstown, 16.VIII.1975, 21.VI.1979, 30.VII.1978, 8.VII.1983, E.J. Kiteley (1ɗ, 4ΨΨ, CNC). Saint­ Antoine­Abbé, 28.XII.1979, A. Larochelle (1ɗ, 2ΨΨ, CMNH, CNC). Saint­Étienne (Lévis), 8.IX.1979, C. Chantal (CCC, 2ɗɗ, 4ΨΨ). Cowansville, 16.XI.1979, A. Larochelle (1Ψ, CMNH). Fairy Lake, 14.XI.1928, W.J. Brown (2ΨΨ, CNC). Aylmer (Gatineau), 7–14.VII.2002, 1–12.X.2003, L. LeSage (2ɗɗ, CNC) [étang à castor boueux et largement entouré de quenouilles / bord étang temporaire, en forêt mixte sur affleurement calcaire]. ONTARIO. Ottawa, 13.X.1967, A. Smetana (1Ψ, CNC). Ottawa, Mer Bleue bog, 23–30.IV.1982, 9.VI.1982, L. LeSage (2ɗɗ, 1Ψ, CNC) [pitfall / red oak litter]. 4 mi. E Ottawa, Mer Bleue bog, 28.VI.1980, A. Davies (1ɗ, CNC) [tread muskrat nest]. Merivale [= Ottawa], 21.VII.1953, E.C. Becker (1ɗ, CNC). 3 mi. NW South March, 13.X.1975, S.&J. Peck (1ɗ, CNC) [bog]. Nepean Greenbelt, Jackpine Tr., 18.X.1986, A. Davies (3ɗɗ, 2ΨΨ, CNC) [birch­maple litter beside pond]. Cedar Grove, 5.5 mi. SW North Gower, 6.X.1973, S. Peck (1ɗ, CNC) [wet forest moss]. Milton, 8.IX.1981, M. Sanborne (1ɗ, CNC). Mississippi Lake, Lanark Co., 22.X.1967, A. Smetana (3ɗɗ, 2ΨΨ, CNC). Carillon Park, 6.V.1982, 13.X.1983, E.J. Kiteley (2ΨΨ, CNC). United States of America. MINNESOTA. 3.7 km N Swatara, various dates, R. Haack (109ɗɗ, 58ΨΨ, CMNH, CNC).

Additional Records. NEW BRUNSWICK. 5.3 km SW jct. Hwy 101 & Charters Settlement Rd., York Co., 15 IV.2004, 25.IV.2004, 30.IV.2004, 1.V.2004, 8.V.2004, R.P. Webster (7, RWC) [under alders in moss and litter along margin of small brook]. Canterbury, York Co., 2.V.2004, R.P. Webster (2, RWC) [margin of vernal forest snow melt pool in moist leaf litter]. Hovey Hill Protected Area, Carleton Co., 10.V.2005, R. P. Webster (1, RWC) [in moist leaves and moss near forest pools]. Jacksonville, Carleton Co., 31.V.2005, R. P. Webster (1, RWC) [margin of vernal forest pool in moist leaves]. QUEBEC. Labelle, 13.VIII.1968, J.­P. Lebel (1, CNC). Blandford (Arthabasca), 10.XI.1975, C. Chantal (1, CCC). Rouville (Saint­Hilaire), 29.XI.1992, C. Chantal (8, CCC). Verchères (Varennes), 21.IX.1996, C. Chantal (1, CCC). Saint­Rédempteur (Lévis), 31.X.1981 (1, CCC). Laprairie (Brossard), 1.XI.1992, C. Chantal (4, CCC). Saint­Étienne (Lévis), 23.IX.1975, 4.X.1975, 23.X.1977, C. Chantal (7, CCC). Mont­Saint­Bruno (Chambly), 4.XII.1981, C. Chantal (1, CCC). Gatineau, 9.XI.1975, 4.XI.1975, C. Chantal (2, CCC). Sainte­Julie, 15.IV.1994, 17.IV.1995, C. Chantal (3, CCC). Saint­Nérée (Bellechasse), 21.IX.1975, C. Chantal (1, CCC). ONTARIO. Ottawa (2, CNC). Flint Hill nr Kemptville, 17.X.1985, A. Davies (8, CNC) [sifted beach / maple litter beside logs]. MANITOBA. Sandilands Prov. For., 14.VI.2004, K. Ryan (1, CNC) [pitfall trap]. MAINE. 4 mi. W Orono, Penobscot Co., 28.V.1982, D.S. Chandler (20, NHDE) [sift leaf litter in wet depressions in forest]. Acadia Natl. Park, Hancock Co., 27.VI.59, 1.VII.59 (2, NHDE). Camden Hills State Park, Waldo Co., 29.V.1982, D.S. Chandler (2, NHDE) [sift leaf litter along stream]. Edge of Mud Lake (v. Sinclair), 7.VIII.1962, Darlington (7, MCZ). Monmouth, 27.VI., C.A. Frost (2, MCZ). NEW HAMPSHIRE. 2 mi. S Dover, Strafford Co., 1.VIII.2001, D.S. Chandler (1, NHDE). Spruce Hole, 3 mi. SW Durham, Strafford Co., 30.VIII.1982, D.S. Chandler (1, NHDE) [sift leaf litter along pond].

Description. Habitus ( Fig. 1 ). Color: Head black dorsally; pronotum reddish­black to black; elytra black with intervals 1 and lateral margins, in some specimens also base, paler, reddish to brownish­red; antennomeres 1 and 2 yellow, though antennomere 2 slightly darker than 1 in most specimens; antennomere 3 yellow with apical two­thirds to third infuscate; antennomeres 4–11 reddish­brown; palpi brown to brownish­black; femora and tibiae yellow, tarsi slightly darker, yellowish­brown. Microsculpture: Clypeus without distinct meshes; frons with isodiametric to slightly transverse meshes; pronotum without evident meshes though at high magnification spots of poorly impressed meshes are often visible; elytra with striate microsculpture, microlines poorly evident; abdominal sterna iridescent laterally, microlines indistinct. Head: Proportionally wide, with large eyes; antennomeres 3–11 clearly elongate. Prothorax: Pronotum proportionally short; sides rectilinearly convergent up to near posterior angles; posterior angles about right. Elytra: Striae moderately coarsely punctate up to slightly behind middle of elytra. Male genitalia: Median lobe as illustrated ( Fig. 3 ).

Apparent body length = 2.5–3.0 mm.

Geographical Distribution. This species is known from New Brunswick and Maine west to eastern Minnesota and southeastern Manitoba.

Wing Development. This species is wing­dimorphic. Of the 51 specimens investigated for wing status, two specimens had long wings and the other ones short wings.

Habitat. Adults of this species were found in New Brunswick in moss and leaf litter along the margin of a small intermittent stream shaded by alders, cedars, and balsam firs and in moist leaves and moss along the margin of vernal snow­melt pools. In New Brunswick adults become active on bare patches on the forest floor early in the season when a significant amount of snow is still on the ground. Bembidion semicinctum often cooccurred with B. nigrivestis .

Note. This species belongs to the subgenus Semicampa Netolitzky. It is externally most similar to B. muscicola Hayward and B. praticola Lindroth. Adults of B. nigrivestis differ from those of these two species in having the body distinctly darker dorsally. Specimens of B. muscicola differ also from those of B. nigrivestis in having evident microsculpture meshes on the pronotum while specimens of B. praticola differ also in having transverse microsculpture meshes on the elytra, the body proportionally longer, the head narrower, and the pronotum longer on average (see "Key to Nearctic species of Semicampa " below for measurements).

The subgenus Semicampa contains 25 species: 18 are found in the Palaearctic Region ( Marggi et al. 2003: 266–267) and seven occur in the Nearctic Region. Adults of Semicampa are small (less than 4 mm in length), without or with faint metallic lustre and possess the following character states: frontal furrows parallel on frons, extended and doubled on clypeus to anterior edge; mentum tooth small, flat; pronotum with laterobasal carina and basal edge truncate laterally; lateral edge of elytron not extended beyond humerus; seven punctate striae distinct on anterior third of elytron; striae, particularly lateral ones, obsolete toward apex; two non foveate discal setae (ed3 and ed5) on interval 3, anterior one free, not attached to stria 3; anterior metasternal apophysis marginate, margination relatively close to edge.

Following is a key for the recognition of all but one species of Semicampa found in North America. The species not included, B. rubiginosum LeConte , is known only from the holotype. Based on a superficial study of the specimen, we believe it could be a macropterous adult of B. roosevelti Pic.

Figures

FIGURE 1. Bembidion nigrivestis, habitus (dorsal view). Scale bar = 1 mm.

FIGURES 3 – 5. Median lobe of aedeagus (left lateral view). 3, B. nigrivestis (Rigaud, Quebec); 4, B. iridipenne (holotype); 5, B. nitidicolle (Rosefield, Saskatchewan). Scale bar = 0.2 mm.