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Types Mus. Comp. Zool. Harvard.
Etymology Named after the Mexican state of origin.
Major: rugoreticulum mesad to the eyes very extensive, reaching from near the posterior clypeal border to midway between the eye and occiput; pilosity very dense and long, especially on the dorsal surfaces of the head and on the gastral tergites; anterior strip of pronotal dorsum transversely carinulate; postpetiole from above diamond-shaped.
Minor: pilosity extremely long over most of the body; humerus subangulate in dorsal-oblique view; occiput narrowed, with rudiment of a nuchal collar.
Measurements (mm) Holotype major: HW 1.28, HL 1.42, SL 1.02, EL 0.24, PW 0.66. Paratype minor: HW 0.58, HL 0.74, SL 0.94, EL 0.20, PW 0.42.
Color Major: head indistinctly bicolorous, with capsule anterior to eye level yellow and remainder yellowish brown; mesosoma and appendages yellowish brown; waist and gaster plain light brown.
Minor: indistinctly bicolorous, with head capsule posterior to anterior margin of eye as well as gaster and postpetiolar dorsum light brown; remainder of body dark yellow to brownish yellow. Range Known only from the type locality.
Biology The nest of the type colony was beneath a rock in a forest clearing. A winged queen was present on 31 July.
Figure Upper: holotype, major. Lower: paratype, minor. MEXICO: at road 3.5 km below Omilteme, Guerrero, 2000 m (Cornell University Field Party). Scale bars = 1 mm.
Found most commonly in these habitats: 29 times found in cloud forest, 4 times found in oak cloud forest, 1 times found in cloud forest edge, 4 times found in mesophyll forest, 2 times found in road in coffee farm, 2 times found in wet montane forest, 2 times found in edge of cloud forest, 2 times found in hardwood forest, 1 times found in montane rainforest clearing, 1 times found in ridge oak forest litter, ...
Found most commonly in these microhabitats: 30 times ex sifted leaf litter, 14 times at bait, 5 times beating vegetation, 1 times nest in clay bank, 1 times Malaise trap.
Collected most commonly using these methods: 19 times MiniWinkler, 14 times Baiting, 9 times MaxiWinkler, 5 times Beating, 1 times bait, 2 times Berlese/Winkler, 1 times Search, 1 times Malaise.
Elevations: collected from 880 - 2210 meters, 1793 meters average
Type specimens: paratype Pheidole guerrerana: jtlc000016396