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Mexico, Belize, Guatemala, Honduras, Costa Rica, Colombia. Costa Rica: Atlantic slope of Cordillera Volcanica Central, from 50 to 1100m.
The genus Proceratium comprises mostly rare and cryptic ants of leaf litter and soil, distributed throughout the world in both tropical and temperate zones (Baroni Urbani and de Andrade 2003). Some species of the genus are known to be specialized predators of spider eggs (Brown 1980).
In Costa Rica this species is known from several collections in wet forest habitats. Isolated workers have been collected in Winkler and Berlese samples from La Selva Biological Station and from the 500m site on the Barva Transect. An alate queen was taken in a Project ALAS Malaise trap sample (9-21 April 2001) from the 1100m site on the Barva transect.
Brown, W. L., Jr. 1980 ("1979"). A remarkable new species of Proceratium, with dietary and other notes on the genus (Hymenoptera: Formicidae). Psyche (Camb.) 86:337-346.
Mann, W. M. 1922. Ants from Honduras and Guatemala. Proceedings of the United States National Museum 61:1-54.
(1922, Proc. U. S. Nat. Mus., 61 (13): 6 - 7, worker, queen; type locality: Cecilia, Honduras) is a new synonym of P. silaceum RogerHNS (1863, Berlin. Entomol. Zeitschr., 7: 172, worker; type locality " Nord-America ").
The differences cited by Mann and listed in Snelling's key are all very variable in P. silaceumHNS, as is body size. Specimens from the tropical part of the range usually have the petiolar node thinner from front to rear, and the posterior face is more or less concave and overhung by the slightly produced posterodorsal nodal border, but a tendency in this direction is seen in some northern specimens, for instance, in a worker from the Ouachita Mts. of southwestern Arkansas, and one from Schooler Lake, Choctaw Co., Oklahoma (W. L. Brown). The geographical gap between Honduras and eastern U. S. is now being filled in to some extent. Already in 1911, W. M. Wheeler had collected specimens in Guatemala (Quirigua and without locality except for the country), and now S. and J. Peck have sent samples from litter berlesates in Veracruz, Mexico: near Cordoba, and in the canyon of the Rio Metlac, near Fortin de las Flores. It should only be a matter of time until we have samples from east Texas and Tamaulipas. This case is paralleled by that of Cryptopone gilvaHNS, another ponerine that ranges from the U. S. down through the uplands of Mexico and Central America as far as Panama.
Found most commonly in these habitats: 17 times found in tropical rainforest, 9 times found in cloud forest, 10 times found in montane wet forest, 8 times found in lowland rainforest, 7 times found in ridgetop cloud forest, 7 times found in mixed hardwood forest, 2 times found in 2º mesophil forest, 2 times found in riparian mesophytic forest, 2 times found in 2nd growth forest, 1 times found in moist forest, ...
Found most commonly in these microhabitats: 78 times ex sifted leaf litter, 5 times forest litter, 2 times Hojarasca, 2 times ex sifted litter, 1 times on dead wood, 1 times Malaise trap, 1 times leaf litter, 1 times ex rotten wood, 1 times bajo de M/28, 1 times bajo de M/27, 1 times bajo de M/26, ...
Collected most commonly using these methods: 34 times MaxiWinkler, 29 times MiniWinkler, 18 times Winkler, 6 times Berlese, 3 times flight intercept trap, 2 times Malaise, 2 times search, 1 times Mini Winkler.
Elevations: collected from 50 - 1930 meters, 901 meters average