Strumigenys kraepelini

Identification
Bolton (2000) - As currently understood this species shows considerable variation in size and relative dimensions of head and scape. This, coupled with variation in sculpture of the dorsal alitrunk, leads me to believe that more than one real species may be included here. The question cannot be resolved at present because material representing the varying forms is too sparse. It is certain that the original type-material of kraepelini has long ceased to exist. While I am convinced that Forel’s taxon resides in kraepelini as defined here, designation of a neotype should await the more detailed analysis of variation that is necessary. See notes under Strumigenys barylonga and Strumigenys exilirhina.

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

Nomenclature

 *  kraepelini. Strumigenys kraepelini Forel, 1905c: 8 (w.) INDONESIA (Java). See also: Bolton, 2000: 885.

Worker
Bolton (2000) - TL 2.7-3.0, HL 0.70-0.88, HW 0.38-0.50, CI 52-60, ML 0.32-0.40, MI 42-48, SL 0.45-0.60, SI 110-129, PW 0.27-0.28, AL 0.70-0.85 (18 measured).

Characters of the feae-complex. Preapical tooth short-triangular, its length half or less of the width of mandible at point where tooth arises, always shorter than maximum width of mandible. Outer margin of mandible in full-face view shallowly convex from close to base to level of preapical tooth. With head in full-face view anteriormost point of eye is located just posterior to 0.50 X HL (behind midlength of head). Upper scrobe margin with two freely laterally projecting long flagellate hairs, the posterior one in apicoscrobal position. Cephalic dorsum with 4-6 erect flagellate hairs along the occipital margin, a similar but usually shorter pair present at highest point of vertex. Preocular notch absent, ventrolateral margin of head extremely shallowly evenly concave immediately in front of eye and straight anteriorly. Maximum diameter of eye usually slightly greater than maximum width of scape, rarely less. Pronotal humeral hair flagellate. Pronotal dorsum varying from weakly reticulate-punctate to almost entirely smooth. Pronotal dorsum without standing hairs, mesonotum with 2 pairs of erect flagellate hairs. Dorsal surfaces of waist segments and first gastral tergite with long flagellate hairs. Pleurae and side of propodeum smooth; in profile the mesothorax long and constricted in its anterior half. One or two long fine erect flagellate hairs present on the dorsal (outer) surface of the hind basitarsus and another 1-2 on the hind tibia; similar pilosity present on the other legs. Petiole in profile long and low, node with a strongly differentiated anterior face. Dorsum of node long and low, shallowly convex, much longer than anterior face. In dorsal view petiole node at least as long as broad, usually longer than broad, reticulate-punctate; disc of postpetiole smooth. Basigastral costulae shorter than disc of postpetiole.

Type Material
Bolton (2000) - Holotype worker, INDONESIA: Java, Bogor ( = Buitenzorg), iii.1904 (K. Kraepelin) (holotype lost (probably destroyed in World War II), not in or ).