Eupines (Byraxis) setifera (Broun, 1893)

Shen, Jia-Wei & Leschen, Richard A. B., 2020, Revision of Eupines King of New Zealand (Coleoptera: Staphylinidae: Pselaphinae: Goniaceritae), Zootaxa 4777 (1), pp. 1-84 : 69

Eupines (Byraxis) setifera (Broun, 1893)

Fig. 45 ; map Fig. 54

Bryaxis setifer Broun, 1893b: 173 .

Eupines (Byraxis) setifera : combination and subgeneric assignment by Raffray 1904: 207. Raffray 1911: 83, 1924: 157; Hudson 1923: 364, 1934: 183; Nomura and Leschen 2006: 255; Maddison 2010: 417; Shen and Leschen 2019: 274 .

Type locality: [ WO] Mount Pirongia .

Type depository: BMNH LT ♂, 1 PLT .

Diagnosis: Head with vertexal foveae small and asetose; antennae 10-segmented with 4-segmented antennal club; A4, A5, A6, A7, A8 and A10 unmodified, A8 slightly asymmetrical, A9 strongly asymmetrical and concaved at lateral side, margin of concavity laminate and extended in ventral view, A10 conical and slightly impressed at base in ventral view. Abdominal ventrite 2 with pair of barely visible discal protuberances, inserted with slightly curved apical setae; ventrite 6 with pair of short median struts, about one-sixth of ventral length. Protrochanters with long and acute ventral spine, about two-thirds of protrochanteral width; protibiae with minute apical spine; mesotibiae unmodified.

Redescription: Body length 1.21–1.30 mm; body colour reddish brown to with lighter coloured tibiae and tarsi. Head wider than long; frons not narrowed at end, about three-fourths width of head at eye level; eyes well developed, with about 25 facets; vertexal foveae small and asetose; antennal tubercles moderately developed; postantennal notches distinct and broad; postantennal cavities large, about two-thirds length of antennal tubercles in dorsal view; antennae 10-segmented with 4-segmented antennal club; A4, A5, A6, A7, A8 and A10 unmodified, A8 slightly asymmetrical, A9 strongly asymmetrical and concaved at lateral side, margin of concavity laminate and extended in ventral view, A10 conical and slightly impressed at base in ventral view. Pronotum as long as wide, slightly narrower than head at eye level; with punctiform lateral antebasal foveae. Elytra slightly wider than long, widest at apical two-thirds; humeral calli weak, slightly prominent; sutural stria weak, extending from basal onethird to apex. Abdomen with tergite 1 about 1.2 × longer than tergite 2; ventrite 2 with pair of barely visible discal protuberances, inserted with slightly curved apical setae; ventrite 6 with pair of short median struts, about one-sixth of ventral length. Legs with protrochanters modified with long and acute ventral spine, about two-thirds of protrochanteral width; protibiae with minute apical spine; mesotibiae unmodified. Aedeagus about 0.24 mm long, with slender parameres, slightly curved inwards at apex, slightly sinuate in dorsal view, with three pairs of long subapical setae and two pairs of long apical setae; median lobe with two short sclerites, strongly curved towards each other at apex, slightly narrower than parameres.

Comments: This species is similar to E. (B.) nemoralis by having a similar antennal modification but can be distinguished from it by its protibiae with minute apical spine ( Fig. 45F ), which is lacking in E. (B.) nemoralis .

Distribution: North Island. ND, AK, WO, CL, RI.

Additional material examined: 10 ♂♂, ND: 1, Paihia Opua SF., 22/Jan/1981, G. Kuschel; 2, Waipoua SF., Toronui Track, 30/Oct/1980, G. Kuschel; AK: 1, Bethells Matuku Res., 21/Oct–25/Nov/1983, G. Hall and P.A. Maddison, pit trap; 1, Waitakere Drive, 21/Dec/1944; CL: 2, Little Barrier I., 07/Apr/1984, C.T. Duval, sifted litter; 2, AMNZ, Great Barrier I., Little Windy Hill, 200 m, 21/Nov–13/Dec/2002; RI: 1, NE Ohingaiti Mangamako Rd., Paki-iti Fam, 23/Aug/1985, C.T. Duval, sifted litter. Associated females (16 ♀♀): ND: 3, Paihia Opua SF., 22/Jan/1981, G. Kuschel; 13, Waipoua SF., Toronui Track, 30/Oct/1980, G. Kuschel.

Figures

FIGURE 45. Diagnostic characters of E. (B.) setifera (Broun, 1893). A) Habitus. B) Antenna, in dorsal view. C) Same, in lateral view. D) Same, in ventral view. E) Protrochanter. F) Protibia. G) Ventrite 2. H) Ventrite 6. I) Aedeagus, in dorsal view. J) Same, in lateral view. K) Same, in ventral view. Scale bars: A = 1 mm, B–G = 0.2 mm, H–K = 0.1 mm.

FIGURE 54. Geographic distributions of E. (B.) pannicula sp. n., E. (B.) petila sp. n., E. (B.) platyarthra (Broun, 1893), E. (B.) protibialis sp. n., E. (B.) setifera (Broun, 1893), E. (B.) waikaremoana sp. n., E. (B.) whirinaki sp. n. and E. (B.) undecim sp. n. in New Zealand.