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Types Mus. Comp. Zool. Harvard; Amer. Mus. Nat. Hist.
diagnosis A member of the " bicarinataHNS complex" of the larger piliferaHNS group, comprising agricolaHNS, aureaHNS, barbataHNS, bicarinataHNS, centeotlHNS, cerebrosiorHNS, ceresHNS, defectaHNS, gilvescensHNS, macclendoniHNS, macropsHNS, marcidulaHNS, paiuteHNS, pinealisHNS, vinelandicaHNS, xerophilaHNS, yaquiHNS, and yucatanaHNS, which complex is characterized by the large to very large, forward-set eyes, especially in the minor; and in the major, the occipital lobes lacking any sculpturing (except in aureaHNS); the posterior half of the head capsule smooth and shiny; and the postpetiole seen from above oval, elliptical, or laterally angulate (cornulate in cerebrosiorHNS). P. pinealisHNS differs within the complex by the following combination of traits.
Major: dark spot on vertex; humerus in dorsal-oblique view right-angulate; petiole in side view tapers to a point, and from behind is deeply concave; postpetiolar lateral extension from above horn-shaped; erect pilosity of pronotum long and dense. Minor: humerus in dorsal-oblique view feebly subangulate; postpetiole from above roughly diamond-shaped. Measurements (mm) Lectotype major: HW 1.06, HL 1.24, SL 0.52, EL 0.14, PW 0.54. Paralectotype minor: HW 0.48, HL 0.54, SL 0.46, EL 0.10, PW 0.30.
color Major: head and mesosoma light brown with a slightly reddish tinge; center of head dorsum with contrasting circular dark brown spot, as illustrated; waist and gaster dark brown; appendages brownish yellow.
Minor: concolorous medium brown (brownish yellow, possibly faded, in paralectotype); appendages yellowish brown.
Range Known only from western Texas and a series from Guanajuato, central Mexico.
biology The type colony was found beneath a stone; the nest contained seed caches (Wheeler 1908h). In western Texas, Moody and Francke found three colonies, variously at 1000-1200 m, nesting, respectively, beneath a stone and cow dung and in open soil.
FIGURE Upper: lectotype, major. Lower: paralectotype, minor. TEXAS: Limpio Canyon, Ft. Davis, Davis Mts., Jeff Davis Co., southwestern Texas (W. M. Wheeler). Scale bars = 1 mm.
Found most commonly in these habitats: 1 times found in Creosote bush.
Found most commonly in these microhabitats: 2 times under rock, 1 times soil.
Elevations: collected from 1158 - 1877 meters, 1521 meters average