Revision of the subgenus Nessus of the genus Hypocaccus from Central Europe, with description of a new species (Coleoptera: Histeridae) Author Lackner, Tomáš Zoologische Staatssammlung München, Münchhausenstrasse 21, DE- 81247, Germany; e-mail: tomaslackner @ me. com Author Seres, Gábor Szentmiklósi út 63, I / text Acta Entomologica Musei Nationalis Pragae 2018 Acta. Ent. Mus. Natl. Pragae 2018-10-17 58 2 419 439 http://dx.doi.org/10.2478/aemnp-2018-0033 journal article 5796 10.2478/aemnp-2018-0033 2593a8b2-8a13-4fe0-b5b8-58ea4834527a 1804-6487 4504916 2E9BB0E5-6412-422C-872A-60C2F4BF1D61 Hypocaccus ( Nessus ) hungaricus sp. nov. ( Figs 14–24 ) Type locality. Hungary , Bács-Kiskun megye , Kunpeszér, 47º06′07.5″N , 19º13′45.0″E . Type material. HOLOTYPE : ♁ , mounted on a rectangular mounting card, genitalia extracted and disarticulated, mounted in Euparal on a separate translucent plastic slide under the specimen, ‘ HUNGARY Bács-K. c. / Kunpeszér , Peregi- / házak 29.III.2014 / leg. Gábor Seres [printed] // 47º06’07.5”N / 19º13’45.0”E / in burrow of / Spermophilus cit . [printed] // Hypocaccus ( Nessus ) / hungaricus sp.nov. / HOLOTYPE 2017 / Det.T. Lackner & G. Seres [red label, printed]’ ( HNHM ). PARATYPES ( 71 spec. ): HUNGARY : 1 ♀ , ‘Kalocza / 93 3 / 26T [written] // SAMML / DANIEL [printed] // Nessus / rufipes Payk / det.Dr. Herzer 1944 [printed-written]’ ( ZSM ); 1 ♁, ‘R. Palota / 31.iii.1891 / Hensen [written] // SAMML / DANIEL [printed] // Nessus / rufipes Payk / det. Dr. Herzer 1944 [printed-written]’ ( ZSM ); 1 ♀ , ‘ Saprinus / longistrius / rufipes Pk. Du / Hong.? / Dej. 62 [round, written label] // MUSEUM PARIS / COLL. / DE MARSEUL 1890 [printed]’ ( MNHN ); 1 ♀ , ‘133 / Saprinus / rufipes Pk. / rubripes Er. ? / Hongrie / Krtz. 29 [round, written label] // Saprinus / antiquulus / rubripes? / further text illegible [round, written label] // MUSEUM PARIS / COLL. / DE MARSEUL 1890 [printed]’ ( MNHN ); 1 ♀ , ‘ Ungarn [written] // Hist.-Coll. ( Coleoptera ) / Nr. 49200 / Saprinus antiquulus Illig. / Hungaria / Zool. Mus. Berlin’ ( MFNB ); 1♁ 2♀♀ , ‘ HUNGARY / Kunpeszér / 19.iv.2015 / G. Seres lgt. [written]’ ( CTLA ); 4♁♁, 3♀♀ , 1 spec. , ‘ HUNGARY BácsK.c. / Kunpeszér, Peregi- / házak, pasture / 04.IV.2015 [printed] // inside the burrows of / Spermophilus / citellus / leg. Gábor Seres [printed] // Hypocacculus / rufipes (Payk.) / det.S. Mazur [printed]’ ( CTLA , 1♀ and 1 spec. in CGSE ); 2♁♁, 1♀ , 8 spec. , ‘ HUNGARY Bács-K. c. / Kunpeszér, Peregi- / házak 29.III.2014 / leg. Gábor Seres [printed] // 47º06’07.5’’N / 19º13’45.0’’E / in burrow of / Spermophilus cit . [printed]’ (TLAN; 2 spec. NMPC ); 4♀♀ , 1 spec. , ‘ HUNGARY Kunpeszér / 02.IV. 2014 in burrow / of Spermophilus citellus / leg. Gábor Seres [printed]’ ( CGSE ); 1 spec. , ‘ HUNGARY Pest . c. / Taksony 02.V.2014 / on cottage cheese bait / leg. Gábor Seres [printed]’ ( CGSE ); 1 ♀ , with a specimen of Formica ant on a separate mounting card under the specimen, ‘ HUNGARY Pest c. / Taksony 26.IV.2014 / in a Formica sp. nest / leg. Gábor Seres [printed]’ ( CGSE ); 1 spec. , ‘ HUNGARY Pest .c./ Monorierdő, Bogárzó / 01.IV.2014 / leg. László Nádai [printed]’ ( CGSE ); 1 spec. , ‘ HUNGARY Pest . m. / Erdőkertes, HM / lőtér, 12.IV.2015 / leg.Attila Kotán [printed]’ ( CGSE ); 1 ♁, 9♀♀ , 4 spec. , ‘ HUNGARY Bács-Kiskun / c., Kunpeszér 14.IV.2017 / from Spermophilus citellus / burrow.leg. Gábor Seres [printed]’ ( CGSE ); 2 spec. , ‘ HUNGARY Bács-Kisk.c. / Kunpeszér 19.V. 2013 in / burrow of Spermophilus / citellus leg. Gábor Seres [printed]’ ( CGSE ); 1 ♁, ‘Bpst Umgbg. / Albertfalva [black-framed, printed label] // rufipes / Payk. / coll. H. Diener [printed-written] // Hypocacculus / rufipes (Payk.) / det. S. Mazur [printed]’ ( CTLA ); 1 ♁, ‘Bpst Umgbg. / Issaszegh [printed] // coll. H. Diener [printed] // Hypocacculus / rufipes (Payk.) / det. S. Mazur [printed]’ ( CTLA ); 1 ♁, ‘Isasegh / 1908 v. 17. / coll. H. Diener [printed-written] // Hypocacculus / rufipes (Payk.) / det. S. Mazur [printed]’ ( CTLA ); 1 ♀ , ‘Hu. Pest m. / Fót / Fóti Somlyón [written] // egyelés / 1980 iv.13 / leg.Ádám [written] // Hypocacculus / rufipes (Payk.) / det.S. Mazur [printed]’ ( CTLA ); 1 ♀ , ‘ Budapest / HUNGARIA [black-framed, printed label] // Ex.Coll. / Dr.I. Pereg [printed] // Hypocacculus / rufipes (Payk.) / det. S. Mazur [printed]’ ( HNHM ); 1 ♀ , ‘Albertfalva / 1922 iv. [printed-written] // rufipes / Payk. / coll. H. Diener [printed-written] // Hypocacculus / rufipes (Payk.) / det. S. Mazur [printed]’ ( HNHM ); 1 ♀ , ‘Istvántelek / coll. Sajó // Hypocacculus / rufipes (Payk.) / det. S. Mazur [printed]’ ( HNHM ); 1 ♀ , ‘M-csanak [= Ménfőcsanak] / 1943, vii.27. / Révy D. [black-framed, written] // coll. Dr. D. Révy [printed] // Hypocacculus / rufipes (Payk.) / det. S. Mazur [printed]’ ( HNHM ); 1 ♀ , ‘Hu.occ.1950 / Velencei-tó [printed] // Dinnyés,V.17 / homok-gödörben [printed] // legit. Dr. Kaszab [printed] // Hypocacculus / rufipes (Payk.) / det. S. Mazur [printed]’ ( HNHM ); 1 ♀ , ‘ Budapest / Újpest-Alag [printed-written] // 1931 v.1. / coll. H. Diener [printed-written] // Hypocacculus / rufipes (Payk.) / det. S. Mazur [printed]’ ( HNHM ); 1 ♀ , ‘Hu. Pest m. / Táborfalva / legelő, egyelés [written] // 1981 iv. 8. / Leg. Migály [written] // Hypocacculus / rufipes (Payk.) / det. S. Mazur [printed]’ ( HNHM ); 1 ♀ , ‘Nagykovácsi 1956 / Nagyszénás V. 9. [printed] // Exc. Kaszab / & Székessy // Hypocacculus / rufipes (Payk.) / det. S. Mazur [printed]’ ( HNHM ); 1 ♀ , ‘HUNG. Pest m. / Domony, Domonyvölgy, / autóshálózás, / 2015 IV.11. , Merkl Ottó’ ( HNHM ); 1 ♀ , ‘Bpst. Umgb. / Újpest-Alag [printed] // coll. H. Diener [printed] // Hypocacculus / rufipes (Payk.) / det. S. Mazur [printed]’ ( HNHM ); 1 ♀ , ‘Hu.occ.1950 / Velencei-tó [printed] // Dinnyés / V. 17-18 [printed] // legit / Dr. Kaszab // Hypocacculus / rufipes (Payk.) / det. S. Mazur [printed]’ ( HNHM ); 2 ♀♀ , ‘Siófok / Lichtneckert [printed] // curtus / ROSENH. / det. S. Mazur [printed-written] // Hypocacculus ( Nessus ) / puncticollis (Küster) / P. Vienna det., 2004 [black-framed, printed label]’ ( HNHM );1♁, ‘ Budapest [printed] // coll. / Dr. R.Streda [printed] // Hypocacculus / rufipes Payk. / det.Blühweisz [printed-written] // Hypocacculus / rufipes (Payk.) / det. S. Mazur [printed]’ ( HNHM ); 1 ♁, side-mounted on a triangular mounting card, genitalia extracted, ‘Hunga- / ria [printed] // Hypocacculus / rufipes Payk. / Coll. Schmidt- / Bickhard [printed]’ ( MFNB ). AUSTRIA : 1 ♁, ‘ Austria [written] // Hypocacculus / rufipes Payk. / Coll. Schmidt- / Bickhard [printed]’ ( MFNB ). All paratypes provided with following red and printed label: ‘ Hypocaccus ( Nessus ) / hungaricus sp.nov. / PARATYPE 2017 / Det. T. Lackner & G. Seres’ Figs 14–15. Hypocaccus ( Nessus ) hungaricus sp. nov. 14 – habitus, dorsal view. 15 – ventrolateral view, arrow points the metaventrite with tubercles. Differential description. The new species ( Fig. 14 ) is generally very similar to H . ( N .) rufipes , differing from it only slightly. Therefore we chose not to provide the new species with a full description, rather pointing out the most significant characters that differentiate it from H . ( N .) rufipes . Body ( Fig. 14 ) generally smaller ( PEL : 1.40–2.00 mm; APW: 0.75–1.00 mm; PPW: 1.25–1.50 mm; EW: 1.45–1.80 mm; EL: 1.00–1.30 mm), more rectangular-oval ( H . ( N .) rufipes is more round-oval); pronotum more parallel-sided, anterior angles distinctly obtuse; punctation of pronotal disc laterally very coarse and dense, punctures sometimes almost forming elongate rugae (in H . ( N .) rufipes punctation of pronotal disc likewise becomes denser laterally, but punctures never form elongate rugae); cuticle never metallic, rather dark-brown to almost black (in H . ( N .) rufipes cuticle is variable, but often shiny to slightly metallic, can be with bronze or even greenish hue); alutaceous microsculpture among frontal punctures more marked than in H . ( N .) rufipes . Males with two faint, but discernible small tubercles situated on basal third of metaventrite medially ( Fig. 15 ). The two species differ in the form of male terminalia, especially eighth sternite, which is narrowing anteriorly in H . ( N .) hungaricus while it is almost parallel-sided in H . ( N .) rufipes (compare Figs 16–17 with 3–4). The aedeagus of H . ( N .) hungaricus is slightly shorter and stouter than in H . ( N .) rufipes (compare Figs 10 with 23). Etymology. Patronymic, named after the country of origin. Distribution. Known so far only from Hungary and Austria. Records from Austria do not carry any specified data and could also originate from the former Austro-Hungarian Empire meaning that they were actually collected in Hungary . An overlooked species, confused with H . ( N .) rufipes , possibly spread over a larger area. Figs 16–24. Male genitalia of Hypocaccus ( Nessus ) hungaricus sp. nov. 16 – VIII sternite and tergite, ventral view; 17 – ditto, dorsal view; 18 – ditto, lateral view; 19 – IX and X tergites, dorsal view; 20 – ditto, lateral view; 21 – IX sternite (spiculum gastrale), ventral view; 22 – ditto, lateral view; 23 – aedeagus, dorsal view; 24 – ditto, lateral view. Biology. So far found only in the burrows of European Ground Squirrel ( Spermophilus citellus (Linnaeus, 1766)) ; an apparent nidicole. A single specimen was collected in a nest of Formica sp., probably accidentally. Some specimens were collected in pitfall traps baited with cottage cheese. Note. Already REICHARDT (1941: 296) mentioned ‘some specimens from Hungary possess more parallel-sided pronotum with distinctly obtuse anterior pronotal angles, while their body measurements are generally smaller’. Unfortunately REICHARDT (1941) did not pay much attention to these character states and did not compare the male genitalia among populations. Obviously he also overlooked the faint metaventral tubercles.