Chelipoda tangerina Published 2007, sp. n.

33. Chelipoda tangerina sp. n.

[Figs. 67, 114, 122]

Type material. Holotype ♂: New Zealand, South Is., FD, Darren Mts., South Gully, Tutoko Bench, 945– 1219m?/ i/1977, JSD [NZAC]. Paratypes: 8♂, 3♀ same data as holotype, various dates in January 1977; 1♂, 3♀, OL, Rees Saddle, 1450–1800m, 14/ii/1980, JCW [NZAC]; 2♀, OL, Dart Valley, 940m, JCW [NZAC]; 1♀, OL, peak 2.4 km W of Mt Tyndall, 16/ii/1980, JSD [NZAC]; 1♀, MC Arthurs Pass, Klondike Corner, 8/ii/ 1982, CFB [NZAC]; 1♂, FD, Barland Saddle, Fiordland NP, 1010m 2/ii/1982, JWE [LUNZ].

Etymology: a reference to the tangerine colour of the thorax and antennae.

Description. Male: length = 2.0mm.

Head: subspherical, black, front of frons orange, vertex and occiput dusted grey, face strongly golden dusted. Bristles yellowish to blackish; ocl and verticals similarly strong, Only one vertical (vt1) distinguishable, the outer vertical (vt2) being congruent with upo; no pile on lower occiput. Antennae (Fig. 114) bright orange, arista black; basal segments as long as wide; postpedicel short pointed ovate, almost triangular, barely longer than wide, thinly pilose; arista bare, 3X as long as postpedicel. Proboscis black, palpi rather broad, brownish yellow with 3–4 short dark apical setae.

Thorax: orange, uniformly pale dusted; a small blackish patch on katepisternum immediately posterior of front coxae; sct black, other setae orange or blackish orange; dc5 present and strong; dc1 apparently vestigial; dc2, dc3, pprn, ph, unp, lnp and sa well developed.

Legs: yellow, front trochanter posteriorly and apical two tarsal segments black. C 1 basally with slightly darker stripe in front. C 1 0.8–0.9X as long as thorax, 4.5X as long as deep, bearing small dark bristly hairs anteriorly and a small anteroapical ‘wart’. Front trochanter with a very long yellowish bristle on outer face. F 1 (Fig. 122) 1.1–1.2X as long as C 1, strongly inflated, 3.2X as long as wide, almost trapezoid, posterior face rather flattened, a pv series of short bent hairs on basal 0.5, becoming smaller and displaced posteriorly near base but merging with stronger but still small curving spine-like bristles on apical 0.5 amongst which are 3 much stronger bristles 0.6–0.7 from base; a line of fine av hairs on basal 0.5 discontinuous with series of 12– 13 small black denticle-like bristles on distal 0.5; a patch of posteriorly directed long fine apically curved yellow hairs dorsally and posterodorsally on basal 0.3. T 1 short, 0.6X length of F 1, abruptly curved in distal 0.3, a series of minute adpressed denticles ventrally on basal 0.5 with a short strong black hooked spine immediately beyond. Basal tarsal segments of front leg spinose ventrally; at2 0.6–0.7X as long as at3. Legs otherwise without modified structure or chaetotaxy but tarsi with dorsoapical bristles rather strong, particularly on posterior legs.

Wing: veins brown, yellowish basally; membrane yellowish basally, a strong greyish black patch anteroapically extending from before apex of R 2+3 to tip of M 2; cell dm rather broad; cell cup closed, vein A 1 strong, continuing strongly for a short distance after junction with CuA 2; costa bearing fine erect hairs (perpendicular to plain of wing) before junction with R 2+3.

Abdomen: deep black, lightly dusted greyish. Terminalia (Fig. 67) black; hypandrium large, almost globular but rather elongate with a pair of broad apical hypandrial processes curving strongly anteriorly, a ‘window’ of weakly sclerotized tissue apicoventrally; epandrium fairly broad, slightly overlapping hypandrium below; subepandrial process curved, narrow, strongly sclerotized; cercus apparently free, not fused with epandrium, at least apically; phallus strongly recurved anteriorly on basal section then curving posteriorly with tip upturned and emerging beyond tip of hypandrial processes.

Description. Female: Differing from the male as follows.

Head: antenna duller orange, postpedicel black dorsally.

Thorax: duller orange, pleura tending to be faintly darkened; dc1 not vestigial, 0.3X as long as dc2.

Legs: no anteroapical ‘wart’ on C 1. No long seta on outer face of front trochanter. F 1 not trapezoid, strongly and evenly inflated below, widest 0.3–0.4 from base, a linear series of short black pv spines interspersed with stronger bristles, particularly on basal 0.5; av series of 13–14 black denticles contiguous with 2– 3 strong basal spines. T 1 0.7X as long as F 1, slightly and evenly curved, no ventral hooked spine. Tarsi less strongly bristled, at3 subequal to at2.

Wing: veins yellowish brown; membrane strongly tinged yellow; no dark anteroapical mark.

Abdomen: terminal papillae black with dark hairs.

Comments. C. tangerina has a distinctive bright orange thorax and antennae, contrasting with the black abdomen. It is only doubtfully placed in the C. trepida -group. C. tangerina is only known from alpine regions of New Zealand’s South Island in herb field and tussock grasslands between 940m and 1800m in January and February.