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Mexico, Costa Rica, Panama. Costa Rica: northern Pacific lowlands.
Mackay described this species from five workers captured in a pitfall trap from Lomas Barbudal, a dry forest site in Guanacaste Province. He also reported a collection from 24km SW Cintalpa, Chiapas, Mexico. I collected a worker in a Winkler sample of sifted leaf litter from a small patch of riparian forest at Finca La Pacifica, also in Guanacaste Province. Specimens of M. smithii were in the same Winkler sample.
See also MacKay et al. (2004).
MacKay, W. P. 1998. Dos especies nuevas de hormigas de la tribu Attini de Costa Rica y Mexico: Mycetosoritis vinsoni y Mycocepurus curvispinosus (Hymenoptera: Formicidae). Revista de Biologia Tropical 46:421-426.
Mackay, W. P., J. M. Maes, P. R. Fernandez, and G. Luna. 2004. The ants of North and Central America: the genus Mycocepurus (Hymenoptera : Formicidae). 7pp. Journal of Insect Science, 4:27, Available online: insectscience.org/4.27
Found most commonly in these habitats: 1 times found in dry forest, 1 times found in wet forest.
Found most commonly in these microhabitats: 2 times ex sifted leaf litter.
Collected most commonly using these methods: 2 times Winkler.
Elevations: collected from 40 - 90 meters, 65 meters average