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Types Amer. Mus. Nat. Hist; Mus. Comp. Zool. Harvard.
diagnosis A member of the " bicarinataHNS complex" of the larger piliferaHNS group, comprising agricolaHNS, aureaHNS, barbataHNS, bicarinataHNS, centeotlHNS, cerebrosiorHNS, 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 in both castes; and, in the major, by the occipital lobes lacking any sculpturing (except in aureaHNS); the posterior half of the head capsule almost entirely smooth and shiny; and the postpetiolar node seen from above oval, elliptical, or laterally angular (cornulate in cerebrosiorHNS). P. marcidulaHNS is distinguished within the complex by the following combination of traits.
Major: clavate hairs occasional on mesosoma, with other ordinary pilosity sparse; apex of petiolar node in side view pointed; postpetiolar node from above laterally subangulate.
Minor: promesonotal dorsal profile lined with evenly spaced pairs of clavate hairs.
Measurements (mm) Major (Sierra Blanca, Texas): HW 0.92, HL 1.22, SL 0.56, EL 0.16, PW 0.42.
Syntype minor: HW 0.44, HL 0.48, SL 0.42, EL 0.12, PW 0.28.
color Major: overall yellow, with gaster and legs in lighter shade than rest of body.
Minor: concolorous pale yellow.
Range Known only from central and western Texas.
Biology P. marcidulaHNS is evidently a rare species. Wheeler (1908h) found one colony, nesting beneath a stone at Barton Creek, Texas. In Hudspeth County, Texas, Moody and Francke (1982) found a single colony at 1300 m, nesting in open sandy loam soil.
Figure Upper: major. TEXAS: 5 km south of Sierra Blanca, Hudspeth Co. (O. F. Francke and J. V. Moody). Lower: syntype, minor. TEXAS: Barton Creek, Austin (William M. Wheeler). (Type locality: Barton Creek, Texas.) Scale bars = 1 mm.
Found most commonly in these habitats: 1 times found in Oak-juniper-mequite woodland, 1 times found in Sotol-creosote bush.
Found most commonly in these microhabitats: 1 times under rock, 1 times Carrying seeds of Dasychloa pulchella.
Collected most commonly using these methods: 1 times pitfall.
Elevations: collected at 1372 m
Type specimens: cotype: casent0172968