Pheidole obnixa ^HNS Forel

Pheidole arciruga r. obnixa ^HNS Forel 1913m: 231. Raised to species level by Santschi 1925e: 157. Types Mus. Hist. Nat. Geneve.

Etymology L obnixa ^HNS, steadfast, resolute, allusion unknown.

diagnosis Similar to aberrans ^HNS, cavifrons ^HNS, and longior ^HNS, distinguished as follows.

Major: head comparatively short (Head Length/Head Width 1.2 mm, the same as aberrans ^HNS, much shorter than cavifrons ^HNS and longior ^HNS)', pronotal dorsum covered by widely spaced longitudinal carinulae, with those near the midline curving outward toward the rear; occiput covered by transverse carinulae; humerus, mesonotal convexity, and propodeal spines well developed; a low lobe present on profile of postpetiolar venter. Minor: pronotum covered by semicircular carinulae.

Measurements (mm) Paralectotype major (Rosario de Santa Fe, Argentina): HW 1.20, HL 1.34, SL 0.50, EL 0.14, PW 0.60. Lectotype minor (Buenos Aires): HW 0.52, HL 0.54, SL 0.40, EL 0.08, PW 0.34. color Major: concolorous light brown.

Minor: mesosomal waist yellowish brown, head and gaster light brown. Range Buenos Aires, Cordoba, and Santa Fe, in Argentina. Biology Unknown.

Figure Upper: paralectotype, major (Rosario de Santa Fe, Argentina; only tentatively associated with lectotype minor). Lower: lectotype, minor (Buenos Aires, Argentina). Scale bars = 1 mm.