Eupines ( Byraxis ) anisarthra (Broun, 1914)

Eupines ( Byraxis) anisarthra (Broun, 1914) View in CoL

Fig. 4 View FIGURE 4 ; map Fig. 49 View FIGURE 49

Byraxis anisarthra Broun, 1914b: 169 View in CoL . Hudson 1923: 364, 1934: 185.

Eupines ( Byraxis) anisarthra View in CoL : combination and subgeneric assignment by Nomura and Leschen 2006: 254; Maddison 2010: 417; Shen and Leschen 2019: 259 View Cited Treatment .

Type locality: [ MC] Broken River .

Type depository: BMNH LT ♂, 1 PLT .

Diagnosis: Head with vertexal foveae punctiform; antennae 10-segmented with 2-segmented club; A4, A6, A7, A8 and A10 unmodified, A4 slightly asymmetrical, A5 large and asymmetrical, wider than A4 at middle and longer than A3 + A4, outer margin flat, A9 large, about 4 × longer than A8, A10 conical, about 1.6 × longer than A9. Abdominal ventrite 2 with pair of small discal protuberances, inserted with strongly curved apical setae; ventrite 6 with pair of median struts, about one-fourth of ventral length. Protrochanters with barely visible ventral spine, shorter than one-tenth of protrochanteral width; protibiae and mesotibiae unmodified.

Redescription: Body length 1.51–1.63 mm; body colour reddish brown to dark brown with lighter coloured elytra and legs. Head about as long as wide; frons narrowed at end, slightly shorter than half width of head at eye level; eyes well developed, with about 34 facets; vertexal foveae punctiform; lacking antennal tubercles and postantennal notches; postantennal cavities small, slightly shorter than half length of antennal tubercles in dorsal view; antennae 10-segmented with 2-segmented club; A4, A6, A7, A8 and A10 unmodified, A4 slightly asymmetrical, A5 large and asymmetrical, wider than A4 at middle and longer than A3 + A4, outer margin flat, A9 large, about 4 × longer than A8, A10 conical, about 1.6 × longer than A9. Pronotum wider than long, slightly wider than head at eye level; Elytra slightly wider than long, widest near middle; humeral calli slightly prominent; sutural stria distinctive at base and vaguely visible near apex. Abdomen with tergite 1 about 1.5 × longer than tergite 2; ventrite 2 with pair of small discal protuberances, inserted with strongly curved apical setae; ventrite 6 with pair of median struts, about one-fourth of ventral length. Legs with protrochanters modified with barely visible ventral spine, shorter than one-tenth of protrochanteral width; protibiae and mesotibiae unmodified. Aedeagus about 0.28 mm long; with elongate and thin parameres, curved downwards and twisted at apex, with two long subapical setae; median lobe with two long sclerites, slightly wider than parameres in dorsal view, left one curved inward subapically, right one bent abruptly.

Comments: Eupines ( B.) anisarthra is similar to E. ( B.) minuta by having A5 and A9 similarly modified and can be separated by the unmodified mesotibiae (a small apical spine is present in E. ( B.) minuta ; Fig. 31E View FIGURE 31 ).

Distribution: South Island. MC, CO.

Additional material examined: 3 ♂♂: CO: 2, Carrick Range, Watts Rock, 1380 m, 31/Oct/1979, J.C. Watt, moss, 79/133; 1, JNPC, Old Man Range, Headwaters, Obelisk Ck., 1380 m, 13/Jan/07. Associated females ( 2 ♀♀): 2, CO: Carrick Range, Watts Rock, 1380 m, 31/Oct/1979, J.C. Watt, moss, 79/133.