Syzeton nubifer (LeConte, 1878) Gompel, 2022

Gompel, Nicolas, 2022, The genus Syzeton Blackburn, 1891 (Coleoptera, Aderidae) in the United States of America, Zootaxa 5162 (3), pp. 243-267 : 253-255

Syzeton nubifer (LeConte, 1878) , comb. nov.

( Figures 1 a, d ; 2d, o ; 3d ; 5d )

Xylophilus nubifer LeConte, 1878: 425 ;

Holotype: Florida, Volusia County, Enterprise ( MCZC) ( Werner, 1990)

Zonantes nubifer (LeConte, 1878) : Werner (1990)

Material examined. United States. Alabama: Blount County, Highland Lake , (280 m) [33°53’ N 86°25’ W], light trap, 21.VII.2013, T. King leg. (2 ♂♂, FSCA) ; Dale County, Level Plains [31°17’ N 85°46’ W], black light trap, 28.IV.2011, R. Turnbow leg. (1 ♂, FSCA) ; Dale County, Level Plains [31°17’ N 85°46’ W], black light trap, 31. V.2014, R. Turnbow leg. (2 ♀♀, FSCA) ; Dale County, Level Plains [31°17’ N 85°46’ W], black light trap, 3.VII.2014, R. Turnbow leg. (1 ♂, FSCA) ; Dale County, Level Plains [31°17’ N 85°46’ W], black light trap, 6.VII.2014, R. Turnbow leg. (1 ♂, FSCA) ; Dale County, Level Plains [31°17’ N 85°46’ W], black light trap, 11.VII.2014, R. Turnbow leg. (1 ♂, FSCA) ; Dale County, Level Plains [31°17’ N 85°46’ W], black light trap, 30.VII.2014, R. Turnbow leg. (1 ♀ and 1 ♂, FSCA) ; Dale County, Level Plains [31°17’ N 85°46’ W], black light trap, 10.VIII.2014, R. Turnbow leg. (1 ♂, FSCA) ; Dale County, Level Plains [31°17’ N 85°46’ W], black light trap, 19.VIII.2014, R. Turnbow leg. (1 ♂, FSCA) ; Dale County, Level Plains [31°17’ N 85°46’ W], black light trap, 6.IV.2015, R. Turnbow leg. (1 ♀ and 1 ♂, FSCA) ; Dale County, Level Plains [31°17’ N 85°46’ W], black light trap, 6.IV.2015, R. Turnbow leg. (1 ♀ and 1 ♂, FSCA) ; Dale County, Level Plains [31°17’ N 85°46’ W], black light trap, 11.VI.2015, R. Turnbow leg. (1 ♀, FSCA) ; Dale County, Level Plains [31°17’ N 85°46’ W], black light trap, 30.VI.2015, R. Turnbow leg. (1 ♀, FSCA) ; Dale County, Level Plains [31°17’ N 85°46’ W], black light trap, 11.VII.2015, R. Turnbow leg. (6 ♀♀ and 2 ♂♂, FSCA) ; Dale County, Level Plains [31°17’ N 85°46’ W], black light trap, 16.VII.2015, R. Turnbow leg. (1 ♀, FSCA) ; Dale County, Level Plains [31°17’ N 85°46’ W], black light trap, 24.VII.2015, R. Turnbow leg. (1 ♂, FSCA) ; Dale County, Level Plains [31°17’ N 85°46’ W], black light trap, 3.VIII.2015, R. Turnbow leg. (1 ♂, FSCA) ; Dale County, Level Plains [31°17’ N 85°46’ W], black light trap, 11.VIII.2015, R. Turnbow leg. (1 ♀, FSCA) ; Dale County, Level Plains [31°17’ N 85°46’ W], black light trap, 10.VI.2016, R. Turnbow leg. (1 ♂, FSCA) ; Dale County, Level Plains [31°17’ N 85°46’ W], black light trap, 3.VIII.2016, R. Turnbow leg. (1 ♀, FSCA) . Jefferson County, Birmingham [33°31’ N 86°48’ W], black light trap, 28.IX.1981, F. N. Young leg. (1 ♂, FSCA) . Florida: Alachua County , (200 m) [29°36’ N 82°22’ W], 11.IV.1992, J. Pickering leg. (2 ♀♀, FSCA) ; Alachua County, Highway 236, 2 km W Highway 241, 19.III.1999, C. W. Mills leg. (1 ♀, FSCA) ; Alachua County, Gainesville [29°39’ N 82°19’ W], black light trap, 5.IV.1983, N. Hostettler leg. (2 ♂♂, FSCA) ; Alachua County, Gainesville [29°39’ N 82°19’ W], black light trap,. IX.2000, electric light fixture G. Buckingham leg. (1 ♀, FSCA) ; A Alachua County, Gainesville, San Felasco Hammock Preserve State [29°42’ N 82°27’ W], 15.IX.1988, M. C. Thomas leg. (1 ♀, FSCA) ; Alachua County, Gainesville, S side Bivens Arm Lake , (30 m) [29°37’ N 82°20’ W], 20.I.2000, P. E. Skelley leg. (1 ♂, FSCA) ; Alachua County, Gainesville, S side Bivens Arm Lake , (30 m) [29°37’ N 82°20’ W], 4.III.2000, P. E. Skelley leg. (2 ♂♂, FSCA) ; Alachua County, Gainesville, S side Bivens Arm Lake , (30 m) [29°37’ N 82°20’ W], live oak, black light, 10.II.2008, P. E. Skelley leg. (1 ♀, FSCA) ; Alachua County, Gainesville, S side Bivens Arm Lake , (30 m) [29°37’ N 82°20’ W], black light, 24.III.2008, P. E. Skelley leg. (1 ♂, FSCA) ; Alachua County, Gainesville, S side Bivens Arm Lake , (30 m) [29°37’ N 82°20’ W], flight intercept trap, 27.III.2011, P. E. Skelley leg. (2 ♀♀, FSCA) ; Alachua County, Gainesville, 3517 NW 10th Avenue , (30 m) [29°39’ N 82°22’ W], black light trap, 24.XI.1972, R. E. Woodruff leg. (2 ♀, FSCA) ; Alachua County, Gainesville, 3517 NW 10th Avenue , (30 m) [29°39’ N 82°22’ W], at light, 31.VIII.2008, R. E. Woodruff leg. (1 ♀, FSCA) ; Alachua County, Gainesville, 610 NW 54th Terrace , (30 m) [29°39’ N 82°24’ W], 25.VIII.1994, L. Stange leg. (1 ♀, FSCA) ; Dade County, Camp Mahachee, South Miami, (5 m) [25°40’ N 80°16’ W], 10.IV.1993, M. C. Thomas leg. (2 ♀♀ and 1 ♂, FSCA) ; Escambia County, Cantonment, 2666 Monica Lane , (40 m) [30°33’ N 87°18’ W], black light trap, 10.IV.2009, T. Dobbs leg. (1 ♂, FSCA) ; Hernando County, Withlacoochee State Forest, Richloam Unit , (35 m), 10.IV.1991, R. Turnbow leg. (1 ♂, FSCA) ; Hernando County, Withlacoochee State Forest, Richloam Unit , (35 m), 27.IV.1991, R. Turnbow leg. (1 ♀ and 1 ♂, FSCA) ; Jackson County, Florida Caverns State Park , (20 m) [30°48’ N 85°13’ W], black light trap, 5.V.2008, M. C. & S. Thomas leg. (2 ♀♀ and 1 ♂, FSCA) ; Leon County, Tall Timbers Research Station, Woodyard Hammok , (60) [30°39’ N 84°12’ W], Berlese funnel, 24.XI.1972, C. W. O’Brien leg. (1 ♀, FSCA) ; Liberty County, Torreya State Park , (40 m) [30°33’ N 84°56’ W], black light trap, 3.V.2003, M. C. Thomas leg. (3 ♀♀, FSCA) ; Liberty County, Torreya State Park , (40 m) [30°33’ N 84°56’ W], 6.V.2007, M. C. Thomas leg. (2 ♀♀, FSCA) ; Liberty County, Aspalaga Landing , (20 m) [30°37’ N 84°54’ W], Malaise trap, 31.X.2002, DJP leg. (2 ♀♀, FSCA) ; Pasco County, Green Swamp West, McNeil Trailhead [28°18’ N 82°03’ W], Hardwood /coniferous forest, Beaten from branches of hardwood tree, 15.I.2014, J. P. Gruber leg. (1 ♂, WIRC) ; Hardwood /coniferous forest, Beaten from branches of hardwood tree, 16.I.2014, J. P. Gruber leg. (2 ♀♀, WIRC) ; 17.I.2014, J. P. Gruber leg. (1 ♀, WIRC) ; Pasco County, Green Swamp West, Main Entrance , (30 m) [28°22’02” N 82°07’04” W], Mixed hardwood/coniferous forest, Beaten from fan-like leaf of palm, 12.I.2014, J. P. Gruber leg. (1 ♀, WIRC) ; Pasco County, Green Swamp West, Main Entrance , (30 m) [28°22’02” N 82°07’04” W], Mixed hardwood/coniferous forest, Beaten from branches of various hardwood trees, 12.I.2014, J. P. Gruber leg. (5 ♀♀ and 1 ♂, WIRC) ; Pasco County, Upper Hillsborough Wildlife Management Area [28°15’32” N 82°06’50” W], Hardwood /coniferous forest, Beaten from branches of hardwood tree, 17.I.2014, J. P. Gruber leg. (1 ♂, WIRC) . Georgia: Clarke County [33°54’ N 83°16’ W], 14.IX.1991, J. Pickering leg. (1 ♀, FSCA) , 14.IX.1991. Louisiana: Allen Parish, Whisky Chitto Creek , (25 m) [30°41’ N 92°52’ W], Wet-mesic hardwood forest, Ex. foliage of mixed hardwoods, along streamlet; bordering Pinus cutover, 7.XI.2014, J. P. Gruber leg. (1 sp., NGPC) ; East Baton Rouge Parish, Baton Rouge, Place Du Plantier Apartments (5m) [30°23’55” N 91°09’13” W], Berlese forest litter, 30.XII.1993, E. G. Riley leg. (1 sp., TAMU) ; Rapides Parish, Indian Creek Reservoir, (25 m) [31°08’ N 92°28’ W], Dry-mesic open Pinus palustris forest, Ex. foliage of mixed hardwoods, 7.XI.2014, J. P. Gruber leg. (2 sp., NGPC) . Mississippi: Oktibbeha County, Osborn Prairies , (100 m) [33°30’ N 88°44’ W], 27.V.2017, R. Turnbow leg. (1 ♀, FSCA) . North Carolina : Haywood County, I-40, N of Waynesville , (840 m) [35°34’ N 82°58’ W], 2.VII.1985, H. V. Weems Jr. leg. (1 ♀, FSCA) . Oklahoma: Latimer County [34°50’ N 95°18’ W], UV,. VIII.1998, K. Stephan leg. (1 sp., TAMU) . South Carolina : Berkeley County, Francis Marion National Forest, Guilliard Lake Recreational Arena , (10 m) [33°17’03” N 79°37’07” W], 27.V.2006, E. G. Riley leg. (1 sp., TAMU) . Texas: Brazos County, 5 km SW Wellborn , (80 m) [30°30’ N 96°20’ W], 16.VII.2016, at lights, V. Belov leg. (1 ♂, VBPC) , 30.VII.2016, at lights, V. Belov leg. (1 ♂, VBPC) , 23.VIII.2016, at lights, V. Belov leg. (1 ♀, VBPC) , 6.IX.2016, at lights, V. Belov leg. (1 ♀, VBPC and 1 ♀, NGPC), 7.IX.2016, at lights, V. Belov leg. (1 ♀, VBPC) , 8.IX.2016, at lights, V. Belov leg. (1 ♀, VBPC) , 12.IX.2016, at lights, V. Belov leg. (1 ♀, VBPC) , 17.IX.2016, at lights, V. Belov leg. (1 ♀, VBPC) , 26.IX.2016, at lights, V. Belov leg. (1 ♂, VBPC) , 27.IX.2016, at lights, V. Belov leg. (2 ♂♂, VBPC) , 5.X.2016, at lights, V. Belov leg. (1 ♀, 2 ♂♂ and 1 sp., VBPC) , 6.X.2016, at lights, V. Belov leg. (1 ♀, VBPC) , 14.X.2016, at lights, V. Belov leg. (1 ♀, VBPC) , 16.X.2016, at lights, V. Belov leg. (1 ♀, VBPC) , 17.X.2016, at lights, V. Belov leg. (2 ♂♂, VBPC) , 21.X.2016, at lights, V. Belov leg. (1 ♂, VBPC) , 24.X.2016, at lights, V. Belov leg. (1 ♀ and 3 ♂♂, VBPC) , 31. X.2016, at lights, V. Belov leg. (2 ♀♀ and 3 ♂♂, VBPC) , 1.XI.2016, at lights, V. Belov leg. (3 ♂♂, VBPC) , 2.XI.2016, at lights, V. Belov leg. (1 ♀ and 2 ♂♂, VBPC) , 4.XI.2016, at lights, V. Belov leg. (3 ♂♂, VBPC) , 18. III.2017, at lights, V. Belov leg. (1 ♀, VBPC) , 27.III.2017, at lights, V. Belov leg. (1 ♀, VBPC) , 29.III.2017, at lights, V. Belov leg. (1 ♂, VBPC) , 13.IV.2017, at lights, V. Belov leg. (2 ♂♂, VBPC) , 14.IV.2017, at lights, V. Belov leg. (1 ♀, VBPC) , 15.IV.2017, at lights, V. Belov leg. (1 ♀, VBPC) , 16.IV.2017, at lights, V. Belov leg. (2 ♀♀ and 1 ♂, VBPC) , 18.IV.2017, at lights, V. Belov leg. (1 ♀, VBPC) , 19.IV.2017, at lights, V. Belov leg. (7 ♂♂, VBPC) , 21.IV.2017, at lights, V. Belov leg. (3 ♀♀ and 2 ♂♂, VBPC) , 22.IV.2017, backyard, vegetation, V. Belov leg. (1 ♀ and 1 sp., VBPC) , 25.IV.2017, at lights, V. Belov leg. (1 ♀ and 1 ♂, VBPC) , 1.V.2017, at lights, V. Belov leg. (1 ♀, VBPC) , 13.V.2017, at lights, V. Belov leg. (2 ♀♀ and 2 ♂♂, VBPC) , 15.V.2017, at lights, V. Belov leg. (1 ♂, VBPC) , 19.V.2017, at lights, V. Belov leg. (1 ♀, VBPC) , 4.VI.2017, at lights, V. Belov leg. (1 ♂, VBPC) , 8.VI.2017, at lights, V. Belov leg. (1 ♂, VBPC) , 11.VI.2017, at lights, V. Belov leg. (1 ♀ and 1 ♂, VBPC) , 20.VI.2017, at lights, V. Belov leg. (2 ♀♀ and 1 ♂, VBPC) , 26.VI.2017, at lights, V. Belov leg. (1 ♂ and 2 sp., VBPC) , 14.VII.2017, at lights, V. Belov leg. (1 ♂, VBPC) , 8.X.2018, at lights, V. Belov leg. (1 ♀ and 1 ♂, VBPC) , 19.V.2019, at lights, V. Belov leg. (1 ♀, VBPC) , 26.V.2019, at lights, V. Belov leg. (1 ♀, VBPC) , 7.IV.2020, at lights, V. Belov leg. (1 ♀, VBPC) , 17.IV.2020, at lights, V. Belov leg. (1 ♀, VBPC) , 19.IV.2020, at lights, V. Belov leg. (1 ♂, VBPC) , 20. IV.2020 at lights, V. Belov leg. (1 ♂, VBPC) , 24.IV.2020, at lights, V. Belov leg. (1 ♂, VBPC) , 19.V.2020, at lights, V. Belov leg. (1 ♂, VBPC) , 28.V.2020, at lights, V. Belov leg. (1 ♂, VBPC) , 31.V.2020, at lights, V. Belov leg. (1 ♂, VBPC) , 21.VI.2020, at lights, V. Belov leg. (1 ♂, VBPC) , 26.VI.2020, at lights, V. Belov leg. (1 ♂, VBPC) , 3. VII.2020, at lights, V. Belov leg. (1 ♂, VBPC) , 28.VII.2020, at lights, V. Belov leg. (1 ♀ and 1 ♂, VBPC) , 17. IX.2020, at lights, V. Belov leg. (1 ♀, VBPC) ; Brazos County, College Station, Riley Estate , (80 m) [30°35’ N 96°15’ W], 27.VII.2003, E. G. Riley leg. (1 sp., TAMU) , 19.IV.2005, E. G. Riley leg. (1 ♀, TAMU) ; Brazos County, College Station, Lick Creek Park , (70 m) [30°33’38” N 96°13’03” W], 14.IV.1996, E. G. Riley leg. (1 ♀, TAMU) , 5.V.2002, E. G. Riley leg. (1 ♀, TAMU) ; Brazos County, Bryan [30°40’ N 96°22’ W], taken at light, 11.X.1965, J. C. Schaffner leg. (2 ♂♂, TAMU) ; Brazos County, Bryan [30°40’ N 96°22’ W], 13.VI.1988, E. G. Riley leg. (1 sp., TAMU) ; Cameron County, Sabal Palm Grove Ref., Site 8, (3 m) [25°51’06” N 97°25’13” W], Palm forest margin, Resaca bank, 20.IX.2008, E. G. Riley leg. (2 ♀♀, ERPC) ; Cameron County, Sabal Palm Grove Sanctuary , (5 m) [25°51’03” N 97°25’04” W], 5.IV.1987, E. G. Riley & Rider D. leg. (1 sp., TAMU) ; Cameron County, Sabal Palm Grove Sanctuary , (5 m) [25°51’03” N 97°25’04” W], 20.X.1990, T. Carlow & E. G. Riley leg. (1 sp., TAMU) ; Cameron County, Sabal Palm Grove Sanctuary , (5 m) [25°51’03” N 97°25’04” W], 23.IV.1994, E. G. Riley leg. (1 sp., TAMU) ; Cameron County, Sabal Palm Grove Sanctuary , (5 m) [25°51’03” N 97°25’04” W], 4.XI.2013, E. G. Riley & M. A. Quinn leg. (1 sp., TAMU) ; Fort Bend County, Brazos Bend State Park, Whiteoak Trail , (15 m) [29°22’32” N 95°34’38” W], Buckeye-sycamore forest , Beating /sweeping, 25.III.2000, E. G. Riley leg. (1 sp., TAMU) ; Fort Bend County, Brazos Bend State Park, Whiteoak Trail , (15 m) [29°22’32” N 95°34’38” W], Hardwood forest , Beaten from vegetation, 18.IV.2014, J. P. Gruber leg. (5 ♀♀ and 2 ♂♂, WIRC; 2 ♀♀ and 2 ♂♂, NGPC); Houston County , Crocket National Forest , Big Slough Wilderness Area , FR511 & Four C’s trail, (70 m) [31°28’ N 95°08’ W], 15.III.1996, E. G. Riley leg. (1 sp., TAMU) ; Montgomery County, The Woodlands [30°10’ N 95°30’ W], 25.V.1978, J. S. Wappes leg. (3 ♂♂, FSCA) ; Sabine County, Sabine National Forest, 9 mi. E Hemphill, Beech Bottom [31°19’ N 93°42’ W], Beech-Magnolia forest , Malaise trap, 16.IV.1989, R. Anderson & E. Morris leg. (1 sp.) ; Sabine County, Sabine National Forest , ca. 8 mi. E Hemphill, (50 m) [31°23’10” N 93°42’29” W], Malaise trap, 15.III.2008, E. G. Riley leg. (1 sp., TAMU) ; Sabine County, Sabine National Forest , ca. 8 mi. E Hemphill, (50 m) [31°23’10” N 93°42’29” W], UV light trap, 30.III.2008, E. G. Riley leg. (1 sp., TAMU) ; Sabine County, Sabine National Forest , ca. 8 mi. E Hemphill, (50 m) [31°23’10” N 93°42’29” W], Lindgren funnel, 13.IV.2008, E. G. Riley leg. (1 sp., TAMU) ; Sabine County, Sabine National Forest , ca. 8 mi. E Hemphill, (50 m) [31°23’10” N 93°42’29” W], UV light trap, 10.V.2008, E. G. Riley leg. (1 sp., TAMU) ; Sabine County, Sabine National Forest , ca. 8 mi. E Hemphill, (50 m) [31°23’10” N 93°42’29” W], UV light trap, 15.VI.2008, E. G. Riley leg. (1 sp., TAMU) ; Sabine County, Sabine National Forest , 12.6 km, ESE of Hemphill [31°16’42” N 93°44’10” W], Mixed hardwood/coniferous forest, Beaten from branches of Quercus sp. , 13.III.2013, J. P. Gruber leg. (2 ♂♂ and 1 sp., NGPC) ; Sabine County, Sabine National Forest , 12.6 km, ESE of Hemphill [31°16’42” N 93°44’10” W], Mixed hardwood/coniferous forest, Beaten from branches of Quercus sp. , 14.III.2013, J. P. Gruber leg. (4♀♀ and 2 ♂♂, WIRC) ; San Jacinto County, Sam Houston National Forest, Big Creek Scenic Area [30°30’22” N 95°05’20” W], Mixed hardwood/coniferous forest, Beaten from branches of hardwood tree ( Quercus and Carya ), 11.III.2013, J. P. Gruber leg. (1 ♀ and 4 ♂♂, WIRC; 8 sp., NGPC); Tyler County , 5 mi. E Spurger, (20 m) [30°41’ N 94°05’ W], Flight intercept trap under pines, 23.III.1997, Gillogly A. R. leg. (1 sp., TAMU) ; Tyler County, Kirby State Forest , (40 m) [30°34’ N 94°25’ W], Elevated flight intercept, 27.IV.2003, E. G. Riley leg. (1 sp., TAMU) ; Tyler County, Kirby State Forest , (40 m) [30°34’ N 94°25’ W], Ground-level flight intercept trap, 27.IV.2003, E. G. Riley leg. (3 sp., TAMU) ; Walker County, 4 mi. N Huntsville [30°43’ N 95°33’ W], at light, 30.IV.1974, R. Phelps leg. (1 ♀, TAMU) ; Waller County, 15 mi. ENE of Hempstead , (80 m) [30°10’ N 95°50’ W], Beating, 22.IV.1997, Chamberlain W. E. leg. (1 sp., TAMU) .

Distribution. United States: Florida to eastern Oklahoma and Texas, north to North Carolina ( Werner, 1990).

Figures

FIGURE 1. Morphological characteristics of the genus Syzeton Blackburn, 1991. a, uniseriate elytral pubescence (example, Syzeton nubifer (LeConte, 1878)). b, bean-shaped transversal head in dorsal view (example Syzeton ouachitanus (Werner, 1990)). c, pronotum shape in dorsal view, with anterior margin made of segments converging toward head in an obtuse angle (example Syzeton floridanus (Werner, 1990)). d, pedicel (antennomere 2) shorter than antennomere 3 (examples, left, Syzeton ouachitanus (Werner, 1990) and right, Syzeton nubifer (LeConte, 1878)). e, last abdominal ventrite of ♀ with a medial pit (ex- ample Syzeton fasciatus (Melsheimer 1846)). f, enlargement of framed region in panel e, arrow pointing to pit. g, right midtarsus with arrowheads pointing to ventral brush (example Syzeton pallidus (Werner, 1990)). h, right hind femora in ventral view, white frame centered on excavation (example Syzeton pallidus (Werner, 1990)). i, enlargement of framed region in panel h, arrow pointing to excavation. scale bars: 100 µm.

FIGURE 2. Habitus of US Syzeton species. a, Syzeton ouachitanus (Werner, 1990) ♂ from Texas. b, S. fasciatus (Melsheimer 1846) ♂ from Wisconsin. c, S. hubbardi (Casey 1895) ♂ from Oklahoma. d, S. nubifer (LeConte, 1878) ♂ from Texas. e, S. ater (LeConte, 1875) ♂ from Arkansas. f, S. gruberi n. sp. ♂ paratype from Arizona. g, S. arizonae n. sp. ♂ holotype from Arizona. h, S. belovi n. sp. ♂ holotype from Texas. i, S. pallidus (Werner, 1990) ♂ from Texas. j, S. subfasciatus (LeConte, 1855) ♂ from Missouri. k, S. floridanus (Werner, 1990) ♂ from Florida. l, S. signatus (Haldeman, 1848) ♂ from South Carolina. m, S. ouachitanus (Werner, 1990), elytral variation. n, S. hubbardi (Casey 1895), elytral variations, the white lines delinate a ~20º angle between the inner oblique markings. o, S. nubifer (LeConte, 1878), elytral variations, the white lines delinate a ~30–40º angle between the inner oblique markings. Scale bars: 1 mm.

FIGURE 3. ♂ genitalia of US Syzeton species in ventral view (left on all panels) and lateral view (right on all panels, ventral facing to the left). a, Syzeton ouachitanus (Werner, 1990) ♂ from Texas. b, S. fasciatus (Melsheimer 1846) ♂ from Wisconsin. c, S. hubbardi (Casey 1895) ♂ from Oklahoma. d, S. nubifer (LeConte, 1878) ♂ from Texas. e, S. ater (LeConte, 1875) ♂ from Texas. f, S. gruberi n. sp. ♂ paratype from Arizona. g, S. arizonae n. sp. ♂ holotype from Arizona. h, S. belovi n. sp. ♂ holotype from Texas. i, S. pallidus (Werner, 1990) ♂ from Texas. j, S. subfasciatus (LeConte, 1855) ♂ from Missouri. k, S. floridanus (Werner, 1990) ♂ from Florida. l, S. signatus (Haldeman, 1848) ♂ from South Carolina. Note the presence of air bubbles in some of the genitalia presented here. Scale bars: 0.1 mm.

FIGURE 5. External morphology of US Syzeton species. a–l, ♂ right foretibia in upper view. a, Syzeton ouachitanus (Werner, 1990) ♂ from Texas. b, S. fasciatus (Melsheimer 1846) ♂ from Wisconsin. c, S. hubbardi (Casey 1895) ♂ from Oklahoma. d, S. nubifer (LeConte, 1878) ♂ from Texas. e, S. ater (LeConte, 1875) ♂ from Texas. f, S. gruberi n. sp. ♂ paratype from Arizona. g, S. arizonae n. sp. ♂ holotype from Arizona. h, S. belovi n. sp. ♂ holotype from Texas. i, S. pallidus (Werner, 1990) ♂ from Texas. j, S. subfasciatus (LeConte, 1855) ♂ from Missouri. k, S. floridanus (Werner, 1990) ♂ from Florida. l, S. signatus (Haldeman, 1848) ♂ from South Carolina.Arrowheads indicate kinks or other modification of the inner side of the tibias; double black arrow denotes the curve of the tibia. m–n, ♀ antennae with details of antennomere 6–8 (inset). m, S. belovi n. sp. ♀ paratype from Texas. n, S. pallidus (Werner, 1990) ♀ from Texas. o, left hind-leg of S. fasciastus (from Wisconsin) in ventral view (arrow indicates the inflated femur). p–q, pubescence on elytral disc. p, S. belovi n. sp. ♂ holotype from Texas. q, S. arizonae n. sp. ♂ holotype from Arizona. Scale bars: 0.1 mm.