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Types Mus. Hist. Nat. Geneve; 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 characterized by the following traits. Major: dorsal head surface extensively sculptured; occipital lobes horizontally 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.
Major: posterior dorsal profile of head weakly concave; humerus in dorsal-oblique view prominent and sub-rectangular; mesonotal convexity prominent; petiolar node in side view thin; postpetiole from above laterally spinose.
Minor: eyes very large; propodeal spine in side view equilaterally triangular.
Measurements (mm) Syntype major: HW 1.30, HL 1.50, SL 0.64, EL 0.14, PW 0.66.
Syntype minor: HW 0.56, HL 0.64, SL 0.50, EL 0.20, PW 0.34.
Color Major: concolorous light reddish brown.
Minor: body concolorous plain medium brown, mandibles yellow, legs light brown.
Range Known only from the type locality.
Biology P. calensHNS appears to be a commensal of the large harvesting ants in the genus PogonomyrmexHNS. Wheeler (190 lh), in his notes to Auguste Forel on the type series, reported as follows: "This feeble PheidoleHNS was found in a number of instances inhabiting small nests within the precincts of the PogonomyrmexHNS colonies, either on the denuded disks or on the slopes of the gravel cones near the entrances of the agriculturals. It was seen more frequently in this association than either Dorymyrmex pyramicusHNS or Forelius maccookiHNS, and was not seen nesting by itself as is very frequently the case with these species."
Figure Upper: syntype, major. Lower: syntype, minor. MEXICO: Aguascalientes (W. M. Wheeler). Scale bars = 1 mm.