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(Figs. 5A-D, 9E, 10E)
Holotype: worker belonging to colony Eg97-BOR-587, Gunong Rara , Sabah, Malaysia, 25/ii/1997, Eg (ITBC). Paratypes: 4 workers from the same colony to which the holotype belongs (MCZC, MHNG, ACEG, SKYC).
Nontype material examined. MALAYSIA: Sabah: Sepilok Forest [general coll.: SKY 27/viii/1995]; Sarawak: Tower Region, Lambir N. P., Miri [general coll.: SKY, 15/i/1993, 1/iii/1997].
Worker. HL, 0.54-0.58 mm; HW, 0.35-0.36 mm; SL, 0.33-0.37 mm; CI, 60-67; SI, 92-106; WL, 0.75-0.84 mm; PW, 0.26-0.29 mm; DPtW, 0.16-0.19 mm; DPtI, 61-66; PtH, 0.26-0.29 mm; PtNL, 0.25-0.29 mm; LPtI, 96-104 (N=5). Body ferruginous brown. Head in full-face view with weakly convex sides and very shallowly concave occipital border. Eye absent. Antenna relatively short; relative lengths of antennal segments II-XII as seen in Fig. 10E; antennal segment III shorter than IV. Dorsal outline of mesosoma almost straight; posterior margin of propodeal dorsum in dorsal view strongly concave; posterior face of propodeum margined laterally with a well-developed translucent lamella which in profile forming an obtuse angle in upper portion. Petiole including subpetiolar process as long as or a little longer than high, in profile with relatively gentle anterior slope and (weakly) concave posterior outline (above the articulation with gaster); posterodorsal margin of petiolar node in dorsal view weakly and broadly concave; subpetiolar process developed, with conspicuous anteroventral and posteroventral projections; the anteroventral projections relatively thick and not translucent. Abdominal segment III (gastral segment I) in profile relatively short, relatively gently narrowed anteriad in the anterior 3/4; abdominal sternum III weakly convex behind the midlength.
Recognition. Four Oriental and Australian species are morphologically very similar to each other: this species, P. greavesi TaylorHNS, P. salomonis TaylorHNS, and P. vietiHNS sp. nov. The difference between this species and P. vietiHNS is given in the key. It is separated from P. greavesiHNS as follows: in the worker the petiole in profile has a relatively steep anterior slope and straight posterior outline (above the articulation with gaster). Probolomyrmex maryatiaeHNS is barely separated from P. salomonisHNS (holotype worker deposited in MCZC was examined) as follows: in the worker of the former the anterior portion of the subpetiolar process projects strongly and the posterodorsal margin of the petiolar node is relatively broadly concave. In contrast, in the worker of P. salomonisHNS the anteroventral portion of the subpetiolar process forms a round corner and the posterodorsal margin of the petiolar node is relatively narrowly concave.
Distribution. Known only from Borneo.
Found most commonly in these habitats: 1 times found in 2nd growth wet forest, 1 times found in tropical rainforest.
Found most commonly in these microhabitats: 2 times ex sifted leaf litter.
Collected most commonly using these methods: 2 times winkler.
Elevations: collected from 330 - 515 meters, 422 meters average
Type specimens: paratype of Probolomyrmex maryatiae: casent0911224