Strumigenys offina

The two non-type collections of this species are from wet forest litter-samples.

Identification
Bolton (2000) - A member of the koningsbergeri complex in the Strumigenys koningsbergeri-group. This is the only species in the group to lack humeral hairs; see notes under Strumigenys koningsbergeri.

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

Nomenclature

 *  offina. Strumigenys offina Bolton, 2000: 850, fig. 444 (w.) BORNEO.

Worker
Holotype. TL 2.4, HL 0.71, HW 0.64, CI 90, ML 0.30, MI 42, SL 0.35, SI 55, PW 0.31, AL 0.66. With characters of koningsbergeri-complex. Upper scrobe margin from immediately behind frontal lobe expanded into a lamellate flange that is about equal to maximum width of scape (usually best seen in oblique ventral view). Upper scrobe margin with a jagged appearance as the small curved hairs that fringe the margin each arises from a low triangular tubercle; irregular appearance is enhanced by a ragged indentation or concavity of the margin at the level of the eye; eye itself not visible in full-face view. Pronotal humeral hair absent. Dorsal alitrunk completely lacking standing hairs: short erect hairs absent from both pronotum and mesonotum (some non-paratypic workers with a minute erect pair on mesonotum). Katepisternum smooth, remainder of pleurae and side of propodeum usually finely reticulate-punctate, but in some a smooth patch present on metapleuron. Lamella on propodeal declivity broad, its posterior (free) margin usually convex below level of spiracle, less commonly more or less straight. On middle and hind legs bullae of femoral glands usually absent, at most minute and very indistinct. Standing hairs on first gastral tergite narrowly spatulate or at least with their apical portions flattened and weakly expanded.

Paratypes. TL 2.3-2.5, HL 0.68-0.75, HW 0.60-0.67, CI 85-90, ML 0.30-0.31, MI 40-44, SL 0.32-0.36, SI 53-57, PW 0.29-0.32, AL 0.60-0.70 (8 measured).

Type Material
Holotype worker, Malaysia: Sarawak, 4th Division, Gn. Mulu N. P., 830 m., v.-viii.1978, B. M. 1978-49 (P. M. Hammond & J. E. Marshall). Paratypes. 17 workers with same data as holotype (BMNH,, ).

References based on Global Ant Biodiversity Informatics

 * Bolton, B. 2000. The Ant Tribe Dacetini. Memoirs of the American Entomological Institute 65
 * Pfeiffer M.; Mezger, D.; Hosoishi, S.; Bakhtiar, E. Y.; Kohout, R. J. 2011. The Formicidae of Borneo (Insecta: Hymenoptera): a preliminary species list. Asian Myrmecology 4:9-58