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Costa Rica (uplands of Cordillera Central).
Wilson (2003) provisionally synonymized innupta Menozzi under alfaroi. So far, a pattern has held that leads us to treat them as two distinct species. alfaroi is dirty yellow and nests in dead wood on the ground. innupta is always black and nests under epiphytes, usually in the canopy. innupta and alfaroi are sympatric in the Vara Blanca area of Braulio Carrillo National Park.
diana Forel, with which alfaroi may be confused, is yellow, but lacks transverse striae on the vertex.
Wilson, E. O. 2003. Pheidole in the New World: A Dominant, Hyperdiverse Ant Genus. Harvard University Press, Cambridge, Mass
|Pheidole alfaroi||Wilson, E. O., 2003, Pheidole in the New World. A dominant, hyperdiverse ant genus., Cambridge, MA: Harvard University Press: 165, (download)||165||20017|
|Pheidole alfaroi||n. sp.||Emery, C., 1896, Studi sulle formiche della fauna Neotropica., Bollettino della Societa Entomologica Italiana 28, pp. 33-107: 38-39, (download)||38-39||3798|
|Pheidole alfaroi||Forel, A., 1908, Fourmis de Costa-Rica, récoltées par M. Paul Biolley., Bulletin de la Societe Vaudoise des Sciences Naturelles 44, pp. 35-72: 48, (download)||48||4014|
Found most commonly in these habitats: 155 times found in montane wet forest, 37 times found in cloud forest, probably old second growth, matrix of dense bamboo and more open forest, 21 times found in cloud forest, old second growth forest, 6 times found in cloud forest, 5 times found in mature wet forest, 4 times found in cloud forest, old second growth, riparian, 2 times found in cloud forest, primary, along steep ridge near peak, 1 times found in 2nd growth cloud forest, 1 times found in cloud forest, old second growth, matrix of forest and open bamboo areas, 1 times found in habita troncos podridos, ...
Found most commonly in these microhabitats: 70 times Hojarasca, 48 times ex sifted leaf litter, 21 times at bait, 1 times in dead tree, 9 times Hojarasca, bosque, 1 times nest under rock in pasture, 7 times Hojarasca, en bosque paralelo al sendero gradiente fuerte y al lado de paredon, 1 times nest in soil, 1 times at arroz con pollo bait, 4 times Hojarasca, mature forest, dropping, 1 times under epiphytes on dead wood on ground, ...
Collected most commonly using these methods: 104 times Mini Winkler, 13 times search, 37 times miniWinkler, 30 times Malaise, 22 times baiting, 11 times Berlese, 5 times maxiWinkler, 5 times Winkler, 4 times flight intercept trap, 1 times beating.
Elevations: collected from 890 - 1590 meters, 1416 meters average