Strumigenys datryx

Identification
Bolton (2000) - See notes under Strumigenys lichiaensis. This minute species is superficially similar to the common and widely distributed Strumigenys rofocala. The latter lacks flagellate hairs on the hind basitarsus and has the base of the apical antennal segment attenuated and narrowly articulated to the preapical antennomere. In datryx a flagellate hair is present on the hind basitarsus and the apical antennal segment is broad basally and broadly articulated to the preapical segment.

Distribution based on Regional Taxon Lists
Indo-Australian Region: Indonesia, Malaysia.

Nomenclature

 *  datryx. Strumigenys datryx Bolton, 2000: 806 (w.) INDONESIA (Sumatra).

Worker
Holotype. TL 1.6, HL 0.43, HW 0.32, CI 74, ML 0.18, MI 42, SL 0.23, SI 72, PW 0.19, AL 0.44. Characters of smythiesii-complex. Apicoscrobal hair flagellate (distal portion of hair easily broken oft). Marginal pilosity anterior to this of quite dense simple hairs that are moderately long and strongly curved anteriorly. Cephalic dorsum reticulate-punctate, with short straight erect hairs present from level of highest point of vertex to occipital margin; hairs arising at about highest point of vertex longer than maximum diameter of eye. Pronotal humeral hair flagellate. Promesonotal dorsum finely punctulate-shagreenate, much less strongly sculptured than dorsum of head. Pronotal dorsum with 1-2, and mesonotum with 2-3 pairs of erect hairs. In holotype all these hairs are short and simple except for posteriormost mesonotal pair, which is flagellate. Some paratypes have 2 mesonotal pairs flagellate and one or two specimens have a pronotal flagellate pair. This suggests that undamaged specimens may have all promesonotal standing hairs flagellate. Dorsum of petiole node and disc of postpetiole smooth, or the petiole with the minutest vestiges of reticulate sculpture. Standing hairs on first gastral tergite fine, at least some of them flagellate or looped apically. Basigastral costulae shorter than disc of postpetiole.

Paratypes. TL 1.6-1.7, HL 0.43-0.44, HW 0.31-0.32, CI 70-74, ML 0.18-0.19, MI 41-43, SL 0.23-0.24, SI 72-77, PW 0.19-0.20, AL 0.44-0.46 (5 measured).

Type Material
Holotype worker, Indonesia: Sumatra, W Sum., Anai V. Nat. Res., 10 km. W Padangpanjan, 250 m., 17.xi.1989, #18 (Lobl, Agosti & Burckhardt).

Paratypes. 1 worker, Indonesia: Sumatra, Jambi, Mt Kerinci, 3000 m., 12.xi.1989, #13 (Agosti, Lobl & Burckhardt); 4 workers, Sumatra, Sum. Barat, Kotomalintang, Maninjau Lake, 12.vii.1992, SUM 438, 750 m., litter berlesate (Deharveng & Bedos); 6 workers, Sumatra, Kotomalintang, 12.vii.1992, SUM 440, 750 m. (Deharveng & 8edos) (MHNG,, ).