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Types Naturhist. Mus. Basel.
Etymology Referring to the pampas, the Argentine grasslands where presumably the types were collected.
Major: head slightly bicolorous (see Color below); humerus in dorsal-oblique view subangulate; rugoreticulum of head covering a swath between each eye and antennal fossa; carinulae absent from center of vertex, and those to each side reach less than half the distance from eye level to level of occiput; anterior strip of pronotal dorsum carinulate.
Minor: pilosity very long, with some hairs longer than Eye Length; pronotum entirely smooth; occiput narrowed, with convex border, but lacking nuchal collar.
Measurements (mm) Lectotype major: HW 1.40, HL 1.40, SL 0.86, EL 0.22, PW 0.70. Paralectotype minor: HW 0.72, HL 0.76, SL 0.82, EL 0.20, PW 0.46.
Color Major: body concolorous medium reddish brown except for anterior vertex and anterior one-third of head, which is brownish yellow; appendages yellow.
Minor: body plain medium brown, with venter and genae tending to yellowish brown; appendages brownish yellow.
Range Known only from the type locality.
Figure Upper: lectotype, major. Lower: paralectotype, minor. ARGENTINA: Alta Gracia, Cordoba. Scale bars = 1 mm.
Type specimens: lectotype of Pheidole nitidula pampana: casent0922366; paralectotype of Pheidole nitidula pampana: casent0922365, casent0922367, casent0922368; syntype of Pheidole nitidula pampana nigrior: casent0913360, casent0913361