Probolomyrmex petiolatus

The holotype was collected among leaves and humus on the rainforest floor.

Identification
Taylor (1965) - The worker of P. petiolatus differs from that of the sympatric Probolomyrmex angusticeps in its smaller size, with relatively broad head, much shorter scapes, and shorter, more compact petiolar node. The unknown worker of Probolomyrmex boliviensis is undoubtedly similar to P. angusticeps in these features.

Agosti (1994) - This species is easily recognized by the subpetiolar process.

Distribution based on Regional Taxon Lists
Neotropical Region: Brazil, Colombia, Ecuador, Guatemala, Mexico, Panama, Venezuela.

Nomenclature

 *  petiolatus. Probolomyrmex petiolatus Weber, 1940b: 76, fig. 1 (w.) PANAMA. Agosti, 1995: 433 (q.). See also: Taylor, 1965d: 363; Brown, 1975: 57.

Worker
Taylor (1965) - The unique holotype worker of this species has the following dimensions: HL, 0.51 mm.; HW, 0.36 mm.; SL, 0.29 mm.; CI, 71; SI, 81; WL, 0.65 mm.; PW, 0.27 mm.; dorsal petiole width, 0.14 mm.; petiolar node index, 52; petiole height, 0.27 mm.; petiolar node length, 0.23 mm.; lateral petiolar index, 85. Weber's original description adequately characterises this distinctive species.

Agosti (1994) - HL 0.51-0.64, HW 0.35-0.40, SL 0.31-0.41, TL 0.66-0.88, CI 63-69, SI 70, (2 examined).

Queen
Agosti (1994) - HL 0.61, HW 0.42, SL 0.44, TL 0.90. CI 70, SI 104, (1 examined).

Type Material
Taylor (1965) - Holotype worker: Barro Colorado Island, Panama Canal Zone. N. A. Weber Collection (examined).