Eupines (Byraxis) ovalis sp. nov.

Fig. 39; map Fig. 53

Diagnosis: Head with vertexal foveae punctiform; antennae 10-segmented with 2-segmented antennal club; A4, A6, A7, A8 and A10 unmodified, A4 asymmetrical, A5 largest and ovoid, dorsal side broadly impressed, A9 cylindrical and elongate, slightly asymmetrical at apex, A10 conical, about 1.5 × longer than A9. Abdominal ventrite 2 with pair of flat and wide discal protuberances, with strongly curved large apical setae; ventrite 6 with pair of short median struts, about one-fourth of ventral length. Protrochanters with short ventral spine, about one-seventh of protrochanteral width; protibiae and mesotibiae unmodified.

Description: Body length 1.50 mm; body colour dark brown with lighter coloured elytra and tarsi. Head as long as wide; frons slightly narrowed at end, about half length of head at eye level; eyes moderately developed, slightly prominent in dorsal view, with about 31 facets; vertexal foveae punctiform; antennal tubercles weak; lacking postantennal notches; postantennal cavities large, slightly longer than antennal tubercles in dorsal view; antennae 10-segmented with 2-segmented antennal club; A4, A6, A7, A8 and A10 unmodified, A4 asymmetrical, A5 largest and ovoid, dorsal side broadly impressed, A9 cylindrical and elongate, slightly asymmetrical at apex, A10 conical, about 1.5 × longer than A9. Pronotum slightly longer than wide, wider than head at eye level, with punctiform lateral antebasal foveae. Elytra about as long as wide, widest near middle; humeral calli barely visible in dorsal view; sutural stria shallowly extending from base to apex. Abdomen with tergite 1 about 1.5 × longer than tergite 2; ventrite 2 with pair of flat and wide discal protuberances, with strongly curved large apical setae; ventrite 6 with pair of short median struts, about one-fourth of ventral length. Legs with protrochanters modified with short ventral spine, about one-seventh of protrochanteral width; protibiae and mesotibiae unmodified. Aedeagus about 0.27 mm long, with wide and stout parameres, slightly sinuate, bent downwards in lateral view, apex slightly curved, with pair of long subapical setae; median lobe with two large sclerites slightly entwined at apex, widest near middle,

much narrower than parameres.

Comments: This species can be distinguished from all other species by its A5 large and ovoid (Figs. 39 B–D).

Distribution: South Island. BR.

Etymology: The specific epithet refers to the oval-shaped antennomere 5.

Type material ( NZAC): Holotype. ♂, specimen entire, glued on card, aedeagus + one antenna mounted on acetate card: “ NEW ZEALAND, BR, Sewell Peak, 15 Jan 2014, T. Buckley, M. Gimmel, R. Leschen // ant nests under rock, 810 m, 42°24.497'S, 171°20.457'E ”.