Strumigenys rostrataeformis

Identification
Bolton (2000) - A member of the Strumigenys rostrata-group. The two Japanese species of this group described by Brown, Strumigenys incerta and rostrataeformis, are closely related but may be separated by the following characters.

S. rostrataeformis: Anterior clypeal margin transverse between the points where the outer margins of the fully closed mandibles intersect the clypeal margin. Pronotal humeral hair stout and remiform. Longest pair of standing hairs on mesonotum remiform. First gastral tergite with apical and basal transverse rows of standing hairs, no hairs between these rows. Standing hairs behind highest point of vertex not distinctly narrower or finer than those on the frons. Spongiform lobe on side of petiole in dorsal view at least half the width of the disc of the node.

S. incerta: Anterior clypeal margin broadly concave between the points where the outer margins of the fully closed mandibles intersect the clypeal margin. Pronotal humeral hair fine and flagellate. Longest pair of standing hairs on mesonotum simple but blunted apically. First gastral tergite with standing hairs between the apical and basal rows. Standing hairs behind highest point of vertex curved, simple, contrasting with the more spatulate hairs on the frons. Spongiform lobe on side of petiole in dorsal view much less than half the width of the disc of the node.

Distribution based on Regional Taxon Lists
Palaearctic Region: Japan.

Nomenclature

 *  rostrataeformis. Smithistruma rostrataeformis Brown, 1949d: 12 (w.) JAPAN. Combination in Pyramica: Bolton, 1999: 1673; in Strumigenys: Baroni Urbani & De Andrade, 2007: 127. See also: Bolton, 2000: 460.

Type Material
Holotype worker and paratype worker, JAPAN: Shikoku, Umaji (Tosa) (H. Okamoto) (KU, ) [examined].