Strumigenys masukoi

Identification
The only member of the Strumigenys baudueri-group that occurs in the eastern Palaeartic region.

Distribution based on Regional Taxon Lists
Palaearctic Region: Japan.

Nomenclature

 *  masukoi. Smithistruma masukoi Ogata & Onoyama, 1998: 283, figs. 12, 13 (w.) JAPAN. Combination in Pyramica: Bolton, 1999: 1673; in Strumigenys: Baroni Urbani & De Andrade, 2007: 123. See also: Bolton, 2000: 391.

Description
Bolton (2000) - TL 2.2-2.3, HL 0.61-0.63, HW 0.41-0.42, CI 65-69, ML 0.10-0.12, MI 15-19, SL 0.30-0.32, SI 72-77, PW 0.26-0.27, AL 0.58-0.60 (4 measured).

Counting from base of mandible teeth 1, 3 and 5 subequal in length, each distinctly longer than teeth 2 and 4; with 14 teeth and denticles in total. Clypeal dorsum smooth and shining, contrasting with the densely reticulate-punctate vertex. Hairs on dorsum of clypeus very short and spatulate, appressed. Hairs fringing the clypeal margins short spatulate and slightly projecting. With head in full-face view the dorsolateral margin with 2 projecting long flagellate hairs, the first is apicoscrobal, the second is on the side of the occipital lobe. Eye small but strongly convex, visible in full-face view. Leading edge of scape with short narrowly spoon-shaped hairs that are sharply angled toward the apex of the scape. Cephalic dorsum with dense curved narrowly spatulate ground-pilosity and with two pairs of standing flagellate hairs, one pair just in front of the highest point of the vertex, the other behind the highest point. Pronotal humeral hair flagellate. Pronotal dorsum smooth, the mesonotum densely reticulate-punctate. Propodeal dorsum almost smooth, with extremely faint punctulate sculpture; propodeal declivity smooth. Dorsal alitrunk with very dense fine curved ground-pilosity; a single pair of flagellate hairs at about the pronotal midlength and another pair present on the mesonotum. Legs densely clothed with soft appressed fine hairs, the tibiae and basitarsi also with freely projecting long flagellate hairs present. Petiole and postpetiole dorsally with short fine curved ground-pilosity and longer posteriorly curved simple hairs. First gastral tergite with numerous fine curved to flagellate standing hairs. Dorsum of petiole node weakly punctulate, the postpetiole disc and gaster glassy smooth. Petiole in dorsal view with spongiform lobes large, the lateral lobes strongly projecting and the thickness of the posterior collar about half the length of the disc of the node.

Type Material
Bolton (2000) - Holotype and paratype workers, JAPAN: Manazuru-misaki, Kanagawa Pref., Honshu, 3.vii.1983 (K. Masuko); paratype workers with same data but 21.vi.1982; other paratype workers, Mt Kakezuyama, Hiroshima Pref. (Y. Touyama) (KU, ) [examined].