Strumigenys yasumatsui

Identification
Bolton (2000) - The lack of the various grooves and impressions in the head that are usually so obvious in this group, coupled with the clavate petiole and reduced sculpture, makes yasumatsui the most distinctive of the bicoloured species and one of the easiest recognised species of the group.

Distribution based on Regional Taxon Lists
Indo-Australian Region: New Guinea.

Nomenclature

 *  yasumatsui. Strumigenys yasumatsui Brown, 1971c: 84, figs. 8, 9 (w.q.) NEW GUINEA. See also: Bolton, 2000: 908.

Worker
Bolton (2000) - TL 3.5-3.6, HL 0.91-0.94, HW 0.58-0.64, CI 64-68, ML 0.50-0.52, MI 53-55, SL 0.68-0.70, SI 109-117, PW 0.34-0.36, AL 0.94-0.96 (3 measured).

Preocular impression in ventrolateral margin of head vestigial, the eyes dome-like and very prominent. Side of head without a vertical groove in front of the eye; without an immediately preocular impression that extends round the ventrolateral margin onto the ventral surface. With head in profile ventrolateral margin behind eye without a concavity. Petiole in profile elongate-clavate, without a differentiated node, the dorsal surface forming an uninterrupted single shallow convexity from junction with propodeum to highest point. Entire side of alitrunk, and most or all of dorsum, unsculptured, smooth and shining. Clypeus dark, remainder of head yellow; pronotum and anterior mesonotum black, remainder of alitrunk yellow; waist segments and gaster blackish brown to black.

Type Material
Bolton (2000) - Holotype worker, paratype workers and queen, PAPUA NEW GUINEA: Aiyura, 1900 m., vi.1962, no. 2116, rotten log, rain forest (R. W. Taylor) [examined].