Adalmus rugiceps ( Broun, 1921 ) Byeon & Chandler & Leschen & Park, 2024

Byeon, Ui-Joung, Chandler, Donald S., Leschen, Richard A. B. & Park, Jong-Seok, 2024, Revision of the New Zealand genus Adalmus with description of six new species (Coleoptera: Staphylinidae: Pselaphinae), Acta Entomologica Musei Nationalis Pragae 64 (1), pp. 17-32 : 25-27

Adalmus rugiceps ( Broun, 1921) , comb. nov.

( Figs 7 , 10 )

Plectomorphus rugiceps Broun, 1921: 509 . Type locality: Glenhope.

Plectomorphus rugiceps : HUDSON (1923: 366); NOMURA & LESCHEN (2006: 240).

Type material. HOLOTYPE: J ( BMNH): // 4023. [J] / New Zealand [red line] Broun Coll. Brit. Mus. 1922-482 / Glenhope, T. Hall, 10.12.1914 / Plectomorphus rugiceps [J].

Additional material examined. SOUTH ISLAND: BR [Buller]: LEAF LITTER TARAMAKAU 17 MARCH 1968 R.A.CUMBER (1 J, genitalia dissected, 1 ♀ NZAC); N of Charleston 23 Dec 1992 F M Climo S30/9725699 // Sphagnum under regrowth rimu (1 J, slide mounted, NZAC); Gorae Fern Flat 25 III 2021 // Forest floor litter. J. Nunn [ JTN] (1 J, genitalia dissected, NZAC); Rahu Res (just at start) 3 Apr 2004, R. Leschen, H. Haman, // litter/beating RL844, 42. 17S, 172.05E (1 ♀ NZAC); 0.8 kmN Bullcok Ck nr. Punakaiki 50m 23.iii.80 broadlf-nikau palm-podocp. A.Newton, M.Thayer // berl, leaf & log litter, forest floor (1 J 3 ♀♀ FMNH). NN [Nelson]: Glenhope. Kiwi 427m Tadmor Nelson // 5 Aug 69 J.I.Townsend // Litter (1 J genitalia dissected, abdomen lost, NZAC). WD [Westland]: Franz Joseph 24.2.89 [handwritten] // J T Nunn collection [ JTN] (1 J, genitalia dissected, 1 ♀ NZAC); 1.8km n Punakaiki, 80m 19.xii.1984 - 20.i.1985 hdwd.for.with nikauA.Newton/M. Thayer 718 // flight intercept (window) trap (3 JJ 6 ♀♀ FMNH); 1.8km n Punakaiki, 50m 19.xii.1984 - 20.i.1985 hdwd.-podo.-nikau for A.Newton/M.Thayer 719 // berl., leaf & log litter, forest floor (1 J

FMNH); 1.5km n Punakaiki, 50m 19.xii.1984 – 20.i.1985 2 o hdwd.-nikau forest A.Newton/M.Thayer 720 // berl, leaf & log litter, forest floor (1 J 3 ♀♀ FMNH); Loop Line Road Scen. Reserve, sse Kumara, 160m, 8–9.i.1985 podocarp-hdwd. forest A.Newton/M.Thayer 730 // flight intercept (window) trap (1 J FMNH); Okuku Ck., 11.3km SSE Kumara 60m 18–22.iii.1980 podocarp-broadlf.A.Newton,M.Thayer // berl, leaf & log litter, forest floor (1 ♀ FMNH); 7.7km SSE Kumara 90m 18–22. iii.80 podocarp-broadlf. A.Newton,M.Thayer // berl, leaf & log litter, forest floor (2 ♀♀ FMNH); L.Mahinapua Scen.Res. 30m 16-22.iii1980 podocarp-mixed broadleaf A.Newton,M.Thayer // berl, leaf & log litter, forest floor (1 J FMNH).

Diagnosis. Males of this species can be distinguished from other Adalmus species by the following characters: profemur convex at distal 1/3 and clavate ( Fig. 7B ); protrochanter unmodified, mesotrochanter with distinct spine ( Fig. 7C ), metatrochanter unmodified and with several setae ( Fig. 7D ); left paramere thick, blunt, shorter than right paramere, right paramere slender, long, and sharp; median lobe elongate and slender, nearly as long as basal bulb, curved, smooth, apex falciform ( Figs 7E–G ).

Redescription. BL 1.94–2.15 mm (FBL 1.50–1.60 mm, 7 specimens measured); body, antenna, and legs reddish- -brown, maxillary palpus and tarsi yellowish-brown; body pubescent ( Fig. 7A ).

Head slightly broader than long (HL: HW = 35: 40), widest across eyes, eyes convex, rostrum broad (HW: RW = 40: 24), ridges of antennal tubercle parallel, depression between ridge of antennal tubercle weakly impressed, apex of rostrum strongly projecting, anterior margin of clypeus not visible in dorsal view; antennal length approximately 1.00– 1.05 mm, antennomere I approximately 2.3 times longer than II, antennomere II longer and broader than III–VIII, antennomeres III–VIII of similar length, antennomeres IX–XI forming indistinct club, XI approximately twice as long as broad.

Thorax. Prothorax slightly wider than head (HW: PW = 40: 48), subhexagonal (PL: PW = 51: 52), broadest at anterior 2/5, gently narrowing from middle, narrowest at anterior margin.

Elytra broader than pronotum (EW: PW = 76: 52), slightly broader than long (EL: EW = 65: 76); with sutural striae; weak impression at elytral foveae; subhumeral foveae present, not visible in dorsal view.

Legs. Protrochanter with smooth posterior margin; profemur weakly rugose on ventral side, convex at distal 1/3 and clavate; mesotrochanter with distinct spine ( Fig. 7C ); metatrochanter with several setae on posterior margin; tibiae and femora moderately long, subequal in length.

Aedeagus asymmetric, 0.38 mm long, with diaphragm and basal stem; parameres asymmetric, left paramere thick, blunt, shorter than right paramere, right paramere slender, long, and apically pointed; median lobe elongate and slender, nearly as long as basal bulb, curved, smooth, with falciform apex.

Sexual dimorphism. Females have the metatrochanter lacking distinct setae.

Comments to classification. Images of the holotype of Adalmus rugiceps taken by one of us (J.-S. Park) which confirms that this species is a member of the genus Adalmus based on the diagnostic characters given above. The unique swollen profemora of this species was noted as a diagnostic character of this species when the holotype was examined (D. S. Chandler, pers. observ.).

Distribution. New Zealand (South Island: BR, NN, WD; Fig. 10 ).

Figures

Fig. 7. Adalmus rugiceps (Broun, 1921). A – male dorsal habitus; B – front leg; C – middle leg; D – hind leg; E–G – aedeagus in ventral (E), lateral (F) and dorsal (G) view.

Fig. 10. Collection localities in New Zealand.