Homaeotarsus serpentinus ( LeConte, 1863 ) Brunke & Schnepp, 2021

Brunke, Adam J. & Schnepp, Kyle E., 2021, Taxonomic Changes in Nearctic Paederinae, New Records and a Redescription of the Enigmatic Genus Acrostilicus Hubbard (Coleoptera: Staphylinidae), The Coleopterists Bulletin 75 (4), pp. 883-894 : 892-893

Homaeotarsus serpentinus ( LeConte, 1863) , new combination

( Fig. 3F )

Cryptobium serpentinum LeConte 1863: 46 .

Lissobiops serpentinus : Casey 1905 (key); Blackwelder 1939 (key); Newton et al. 2000 (key); Newton 2019 (catalog).

Type Material. Syntype (male, MCZ, examined virtually): “[orange disc]/[male symbol]/ C. serpentinum Lec [handwritten label]/Type 6427 [red label]” .

Other Material. UNITED STATES: Indiana: Montgomery Co., Pine Hills Nature Preserve , 9.V.2013, R. M. Brattain (1, RMBC) ; same data except : 20.V.2014 (5, RMBC) ; 23.V.2012 (1, FSCA; 2, RMBC) ; 30.V.2012 (3, RMBC) ; 2.VI.2012 (2, RMBC) ; 27.VIII.2013 (2, RMBC) ; 11.IX.2012 (2, RMBC) ; 4.X.2012 (1, RMBC) ; Tippecanoe Co., sifting forest litter , 8.II.2009, K. Schnepp (1, KESC) ; Tippecanoe Co., Lafayette , 1.X.1978 (1, PERC) ; Tippecanoe Co., W. Lafayette, Purdue Ent .

Res. Area, 30.VIII.1984 (7–10 pm), Entm 406 (1, PERC). Ohio: Athens Co., Albany , sifting damp leaf litter near stream bed, 22.IX.2018, J. Brown [photo record, https://bugguide.net/node/view/1776420] . Virginia: Pulaski , under stone on damp sand, by stream, 25.III.2017, C. Harden [photo record, https://bugguide.net/node/view/1350498]; Rte 340, 3 km N Shenandoah, ex flood debris, 13.VI.1982, Y. Bousquet and A. Davies (3, CNC) . West Virginia: Mercer Co., Camp Creek St. Forest, Marsh Fork Falls , litter rhododendron, hardwoods, 12.X.1970, S. Bird (1, CNC) .

Diagnosis. Homaeotarsus serpentinus is easily recognized within the genus by its black pronotum and bicolored head ( Fig. 3F ).

Distribution. Origin: Nearctic. United States: AL, DC, IN, NC, OH [new record], SC, VA, WV [new record].

Comments. This species is uncommonly encoun- tered but appears to be rather broadly distributed in the southern half of eastern North America. It is newly recorded from Ohio and West Virginia.The species is apparently associated with forested creeks and occurs in flood debris, leaf litter, and under stones. In Virginia, Hoffman (1981) found this species, along with the uncommon bembidiine Bembidion plagiatum Zimmerman ( Coleoptera : Carabidae ), on gravel sandbars overlain with a fine layer of silt.

Figures

Fig. 3. Paederinae. A) Stamnoderus monstrosus, dorsal head, B) Pseudolathra oregonensis, protibia, ventral protrusion absent, C) Lobrathium grande, protibia, ventral protrusion present, D) Homaeotarsus sellatus, dorsal habitus, E) H. cribratus, dorsal habitus, F) H. serpentinus, dorsal habitus. Scale bars = 0.2 mm (A–C), 1 mm (D–F).