Probolomyrmex petiolatus Weber

Taylor, R. W., 1965, A monographic revision of the rare tropicopolitan ant genus Probolomyrmex Mayr (Hymenoptera: Formicidae)., Transactions of the Royal Entomological Society of London 117, pp. 345-365 : 363

Probolomyrmex petiolatus Weber (figs. 34, 35)

Probolomyrmex petiolatus Weber , 1940, Psyche, Comb., Mass. 47, 76, fig. 1, [[ worker ]] Type locality: Barro Colorado Island, Panama Canal Zone. Holotype: N. A. Weber Collection (examined).

The unique holotype worker of this species is illustrated in figures 34 and 35. It 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. The worker of P. petiolatus differs from that of the sympatric P. angusticeps in its smaller size, with relatively broad head, much shorter scapes, and shorter, more compact petiolar node. The unknown worker of P. boliviensis is undoubtedly similar to P. angusticeps in these features.

Distribution. - Known only from the type locality, Panama: Barro Colorado Island.

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