Cawthronia nigra Tonnoir in Tonnoir & Edwards 1927

(Figs 8, 9, 22, 28, 36, 42, 80–89)

Tonnoir & Edwards 1927: 826 (description female), plt. 62, fig. 72 (photo wing).

Holotype. Female, Nelson [South Island], 1 Nov. 1923, A.L. Tonnoir leg. In NZAC (specimen seen).

Diagnosis. This is the only species of Cawthronia and thus recognizable readily by the generic characters. Description. Male. Head. Fig. 8. Nodes of antennal flagellomeres 0.9–1.2 times as long as wide (Figs 86, 89). Apical segment of maxillary palpus less than twice the length of preceding segment.

Thorax. Fig. 36. Wing. Fig. 22. Length 1.9–2.3 mm.

Terminalia. Tergite 9 subtriangular, vaguely 2-pointed, with slight apicomesal depression, with setae of various sizes including very large apical and basolateral setae (Fig. 88). Gonocoxites apically with 1 large dorsomesal seta and 2 smaller ventromesal setae, and setae of various sizes elsewhere (Figs 83, 85). Gonostylus with setae of various sizes including 1 very large dorsomesal seta, and 1 flat, subtriangular apical spine (Figs 80–82). Parameres emarginate apicoventrally, sclerotized and finely serrate apicolaterally (Fig. 84). Ejaculatory apodeme slightly shorter than parameres, with weakly sclerotized, circular apical extension (Fig. 84).

Redescription. Female. Wing. Length 1.9–2.5 mm. Head. Nodes of antennal flagellomeres 0.5 times as long as wide (Fig. 87).

Terminalia. Basicercus longer than disticercus, both segments with numerous short, thick dorsal setulae (Fig. 42).

Distribution and phenology. Endemic to NZ: SO (NN, BR, NC, MC, SL). Confined to South Island. Adults collected in beech, podocarp and mixed beech/podocarp forests up to an altitude of 800 m above sea level. Adult activity almost throughout the year, but no findings known from February, March and July.

Material studied. SO. NN: 6 (4*) males, Kahurangi N. P., Takaka R. valley (Cobb dam road), 31 Aug.–7 Oct. 2001, M. & C. Jaschhof; BR: 18 (2*) males, 9 (3*) females, Cass, Middle Bush, 9 April 1998, P.M. Johns; 4* males, 4* females, same loc. but 11 April 1998; 3 males, 1 female, same loc. but 30 May 1998; 1* male, Maruia F., Shenandoah Saddle, 3–25 Nov. 2001, M. & C. Jaschhof; NC: 3 males, Arthur´s Pass N. P., Bealey Spur, Waimakariri Track, 19 May–13 June 2001, M. & C. Jaschhof; MC: 1* male, Craigieburn F. P., Broken R. skifield road, 4 Dec. 2001, M. Jaschhof; SL: 1 male, Catlins, Purakaunui Scenic Res., 30 Jan. 2002, M. Jaschhof.