Xylophilus crassicornis Muona, 2000

Otto, Robert L. & Karns, Ken D., 2017, New state records for Nearctic false click beetles (Coleoptera: Eucnemidae), Insecta Mundi 2017 (582), pp. 1-21 : 3-4

Xylophilus crassicornis Muona, 2000

( Fig. 2, 3 )

This rarely seen eucnemid species was found in Arkansas, Maryland, Virginia, Wisconsin ( Evans 2011; Muona 2000; Otto 2010, 2012), and now taken for the first time in Connecticut, Delaware, Georgia, Massachusetts, New Jersey, North Carolina, Ohio, Vermont and West Virginia. Specimens were taken from Lindgren funnel traps, intercept panel trap, flight intercept trap, beaten from small dead standing hardwood and from a weed. CONNECTICUT: Hartford County: 8.0 km W Granby, Enders State Forest, 8–24 June 2016, K. Divito (CMNH), Litchfield County: 6.1 km NE Torrington, 5–24 June 2013, K. Divito (CMNH), 6.3 km W Canton, Nepaug State Forest, 8–24 June 2016, intercept panel trap, K. Divito (CMNH); DELAWARE: New Castle County: 4.3 km NW Newark, White Clay Creek State Park, 6–21 June 2016, J. Roman (CMNH); GEORGIA: Elbert County: 1.4 km SW Elberton, 9–23 May 2016, R. Morgan (CMNH), Habersham County: 6 km WNW Turnerville, 27 May–11 June 2014, P. Taylor (CMNH), Murray County: 18 km SSE Chatsworth, 22 April–12 May 2015, C. Van Atta (CMNH), Oconee County: 10.4 km NW Bishop, 8–22 May 2013, P. Walden (CMNH); MASSACHU- SETTS: Berkshire County: 5.8 km SSE Sheffield, 7–21 June 2016, K. Divito (CMNH), 5.8 km SSE Sheffield, 21 June–5 July 2016, M. Conlee (CMNH), Franklin County: 3.9 km E Greenfield, 14–28 June 2016, M. Conlee (CMNH), 8.9 km W Sunderland, Northhampton Upper Reservoir, 28 June–8 July 2016, M. Conlee (GERP); NEW JERSEY: Atlantic County: 5.6 km NNE Corbin City, 25 May–9 June 2016, T. James (CMNH), Camden County: 1.9 km S. Camden, 22 June–6 July 2016, M. Parkinson (CMNH), Warren County: 2.9 km NE Hackettstown, Stephens State Park campground, 24 June–8 July 2009, C. O’Conor (CMNH); NORTH CAROLINA: Henderson County: Fletcher, 5 June 1971, L.L.L. (FSCA); Jackson County: Balsam, 12.VI.1959 (FMNH); OHIO: Cuyahoga County: Cleveland Metro Parks, 15 June–2 July 2007, H. Lee (CMNH), Vinton County: 6.5 km SE Zaleski, 4–11 June 2011 (2), 28 May–5 June 2012 (3), 9–16 June 2012, 4–11 June 2016, 10 June 2016, K.D. Karns (KDKC); VERMONT: Windham County: 3.1 km S Brattleboro, 13–27 June 2016, L. Modesto (CMNH); WEST VIRGINIA: Raleigh County: 6.5 km E Beckley, 6–19 June 2014, R. Braud (CMNH).

Muona (2000) commented on color variation in a related species, Xylophilus cylindriformis (Horn), with some specimens being darker than others. Examination of a number of specimens throughout much of eastern United States indicates that color variations are also present in X. crassicornis . Some specimens were observed to be much darker than others ( Fig. 2 ), contrary to Otto’s (2012) previous diagnostic assessment of the species. A small number of specimens were observed to have completely orange elytra ( Fig. 3 ). Diagnostically, the best character state to identify X. crassicornis from X. cylindriformis is the consistent presence of very shallow, sparse pronotal punctures in X. crassicornis (pronotum densely rugose, punctate in X. cylindriformis).

Figures

Figures 1–6. Nearctic Eucnemidae, dorsal habitus. 1) Schizophilus subrufus. 2) Xylophilus crassicornis (dark form). 3) Xylophilus crassicornis (light form). 4) Hylis irvinei. 5) Adelothyreus dejeani. 6) Microrhagus breviangularis. (Scale: 1.0 mm.)