Strumigenys leptorhina

Identification
Bolton (2000) - A member of the feae complex in the Strumigenys mayri-group. Only two species of the feae-complex lack erect long fine hairs on the dorsal (outer) surface of the hind basitarsus, leptorhina and Strumigenys ecliptacoca. These two species are also the only ones of the complex that lack erect fine hairs on the dorsal surface of the hind femur; in all others at least one such hair is present, and usually more. The two separate easily as leptorhina has elongate-triangular propodeal teeth and conspicuous propodeal lamellae, does not have a freely laterally projecting hair on the upper scrobe margin anterior to the apicoscrobal, and has a narrower head (CI 58-59). In ecliptacoca the propodeum has a pair of minute triangular tubercles and lacks lamellae, the upper scrobe margin has a freely laterally projecting hair anterior to the apicoscrobal (located at about the level of the posterior margin of the eye), and has a broader head (CI 64-65). Finally, in ecliptacoca the there is a small intercalary tooth between the apical fork teeth and the spiniform preapical tooth is nearly twice as long as the maximum width of the mandible. In leptorhina intercalary teeth are absent and the preapical tooth is only approximately equal to the maximum width of the mandible.

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

Nomenclature

 *  leptorhina. Strumigenys leptorhina Bolton, 2000: 886, figs. 470, 512 (w.) BORNEO.

Worker
Holotype. TL 2.9, HL 0.83, HW 0.48, CI 58, ML 0.38, MI 46, SL 0.54, SI 113, PW 0.28, AL 0.80. Characters of the feae-complex. Preapical tooth spiniform, its length about equal to the maximum width of the mandible. Outer margin of mandible in full-face view straight from close to base to level of preapical tooth. Apical fork of mandible without intercalary teeth. Dorsolateral margin of head with two freely laterally projecting simple, non-flagellate hairs, one apicoscrobal and the other posterior to this; upper scrobe margin anterior to apicoscrobal hair does not have freely laterally projecting long hairs. Cephalic dorsum with 4 erect stiff simple hairs along the occipital margin, a similar pair present at highest point of vertex. Preocular notch absent, ventrolateral margin of head minutely shallowly concave immediately in front of eye and straight anteriorly. Pronotal humeral hair flagellate; pronotal dorsum with a pair of inclined curved simple standing hairs, mesonotum with one pair of erect flagellate hairs. Dorsal surfaces of waist segments and first gastral tergite with long flagellate hairs. Pleurae and side of propodeum smooth; dorsal alitrunk reticulate-punctate, tending to be weak or faded anteriorly on pronotum. Dorsal (outer) surfaces of hind basitarsus and hind tibia without erect fine long hairs of any form; dorsum of hind femur without erect long fine hairs. Petiole in profile with a differentiated anterior face that is shorter than the dorsum. Disc of postpetiole narrow, smooth and shining. Basigastral costulae shorter than disc of postpetiole.

Paratype. TL 2.8, HL 0.79, HW 0.47, CI 59, ML 0.36, MI 46, SL 0.51, SI 109, PW 0.28, AL 0.78.

Type Material
Holotype worker, Malaysia: Sarawak, 4th Div., G. Mulu Nat. Pk, RGS Expd., Long Pala, 30.ix.1977, lowland rainforest, leaf litter (B. Bolton). Paratype. 1 worker, Malaysia: Sarawak, Gn. Mulu NP, 200 m., 2.iii.1978, limestone forest, pitfall trap (H. Vallack) (BMNH).