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Types Mus. Comp. Zool. Harvard.
diagnosis A member of the " piliferaHNS complex" of the larger piliferaHNS group, comprising calensHNS, californicaHNS, carrolliHNS, cavigenisHNS, clementensisHNS, creightoniHNS, hopliticaHNS, littoralisHNS, miculaHNS, piliferaHNS, polymorphaHNS, rugulosaHNS, senexHNS, soritisHNS, tepicanaHNS, and torosaHNS, which complex is distinguished by the following traits. Major: dorsal head surface extensively sculptured; occipital lobe transversely rugulose (or, in carrolliHNS smooth, in littoralisHNS foveate, and in miculaHNS and soritisHNS carinulate); postpetiole from above diamond-shaped, trapezoidal, or spinose. Minor: eye medium-sized to large. P. torosaHNS is distinguished within the complex as follows.
Major: bicolorous; transverse rugulae cover posterior fifth of dorsal surface of head in full-face view, and longitudinal carinulae cover all of the remainder of the dorsal surface except the frontal triangle; humerus in dorsal-oblique view prominent and lobose; in side view, mesonotum drops almost vertically to metanotum; propodeal spines very long, stout, and vertical to propodeal basal face; seen from above, postpetiole very wide relative to petiole, and spinose.
Minor: all of head and mesosoma foveolate and opaque; pilosity along promesonotal dorsum consists of evenly spaced pairs of setae.
Measurements (mm) Holotype major: HW 1.56, HL 1.84, SL 0.76, EL 0.20, PW 0.68.
Paratype minor: HW 0.58, HL 0.64, SL 0.62, EL 0.14, PW 0.32.
color Major: bicolorous, with light reddish brown head and appendages contrasting with dark brown mesosoma and gaster.
Minor: concolorous light brown.
Range Known only from the type locality.
Figure Upper: holotype, major. Lower: paratype, minor. MEXICO: El Sueco, Chihuahua. Scale bars = 1 mm.