Thanasimus undatulus (Say, 1835)

Chapman, Eric G., Leavengood, John M. & Dupuis, Julian R., 2025, The Cleridae and Thanerocleridae of eastern North America, with illustrated keys, updated distributions, and special emphasis on the Kentucky fauna, Zootaxa 5639 (1), pp. 1-88 : 67-68

Thanasimus undatulus (Say, 1835) ; Cleridae : Clerinae : Clerini

Illustrations: Plate 5-G. Key to clerid genera, couplet 16-F; Thanasimus key, couplet 1-D, couplet 2-B, C, couplet

Distribution: Transcontinental—CA to TN to NF to AK.

- Recorded from: AK, CA, CO, CT, ID, IL, IN, MA, ME, MI, MN, MT, NH, NM, NY, OR, TN, UT, VT, WA, WI, Alberta, British Columbia, Manitoba, New Brunswick, Newfoundland, Northwest Territories, Nova Scotia, Ontario, Prince Edward Island, Quebec, Saskatchewan and Yukon ( Wolcott 1947; Papp 1960; Ross & Daterman 1995; Mawdsley 1999; Ross et al. 2005; Furness & Kegley 2006; Majka 2006; Dorshorst &Young 2008; Gandhi et al. 2009; Webster et al. 2022; BugGuide). Papp (1960) included Florida and “Lower California ” (i.e., Baja California Sur), which we suspect to be misidentifications of T. dubius . Due to its common collection during semiochemical and forestry-related studies, which are quite numerous, the authors fear that some distributional records may have been overlooked herein.

- New State Record: VERMONT: Rutland County: 3.4 km SSW of Pittsfield, 43.741978N, 72.821597W, 290 m., Wood processing, Lindgren funnel trap with a-pinene + EtOH + monochamol, 21-V-5-VI-2024, PH Team ( JMLC, 1) .

Natural History: Bøving & Champlain (1920) reported it as a predator of bark beetles ( Dendroctonus and others) in fir ( Abies ), cedar (probably referring to Juniperus virginiana ), larch ( Larix ), spruce ( Picea ), pine ( Pinus ) and Douglas fir ( Pseudotsuga ). Mills (1983) reported it to be a predator of the Douglas fir beetle ( Dendroctonus pseudotsugae

Hopkins) and the spruce beetle D. rufipennis (Kirby) in Canada. Dorshorst & Young (2008) reported that nearly all

Wisconsin specimens they examined were from Lindgren funnel traps (most baited with ipsdienol) at lumber mills and conifer stands with jack, red, white pines ( Pinus resinosa , P. strobus , P. banksiana ), and spruce ( Picea ).

Chemical lures: Frontalin + alpha-pinene ( Baker et al. 1977); (R)-(-)-ipsdienol ( Miller 1997); two different blends of the following: alpha-pinene, camphene, beta-pinene, myrcene, limonene, beta-phellandrene, alpha-terpinolene,

alpha-cubebene, bornyl acetate, cis-nerolidol, 1S-borneol, and methyl-isoeugenol ( Macias-Samano et al. 1998);

frontalin + seudenol ( Zhou et al. 2001); ipsenol (Lindgren & Miller 2002).