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Pheidole petrensisHNS new species

Types Mus. Comp. Zool. Harvard.

Etymology Gr L petrensisHNS, at a stone, alluding to the microhabitat of the type colony.

diagnosis A member of the fallaxHNS group similar to haskinsorumHNS, hectorHNS, lattkeiHNS, and susannaeHNS, distinguished as follows. Major: head subrectangular in full-face view; tip of antennal scape just reaches occipital comer; almost entire head, mesosoma, and waist foveolate and opaque; entire central strip of all the gastral tergites shagreened and opaque; rugoreticulum limited to space between eye and antennal fossa; carinulae limited mostly to anterior half of head, absent from rest of body; propodeal spines moderately long and thin.

Minor: propodeal spines long, very thin, needle-like; head capsule in full-face view forms almost perfect oval; nuchal collar present; entire head and body foveolate and opaque; entire central strip of first gastral tergite shagreened and opaque to subopaque. Measurements (mm) Holotype major: HW 1.16, HL 1.26, SL 1.02, EL 0.22, PW 0.62. Paratype minor: HW 0.68, HL 0.84, SL 1.06, EL 0.20, PW 0.46.

color Major: body and appendages medium to dark brown; a darker brown circular spot is present on vertex. Minor: body concolorous light brown.

Range Known only from the type locality.

Biology Collected from beneath a rock. A male was present in the nest on 26 May.

Figure Upper: holotype, major. Lower: paratype, minor. MEXICO: 24 km west of Cuernavaca, Morelos, 2200 m (William P. MacKay). Scale bars = 1 mm.