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Types Naturhist. Mus. Basel.
diagnosis Similar in various traits to species listed in the heading above, distinguished as follows.
Major: brown, with yellow legs; entire dorsum of head except for frontal triangle and midclypeus carinulate; anterior third of pronotal dorsum covered by broken transverse carinulae; all of dorsal surface of head and all of mesosoma foveolate; in side view mesonotal convexity present, although very low; postpetiole seen from above elliptical.
Minor: eye set well forward on head; propodeal spine equilaterally triangular; all of head and mesosoma foveolate; occiput narrowed somewhat, its margin straight; nuchal collar absent.
Measurements (mm) Lectotype major: HW 0.94, HL 0.96, SL 0.52, EL 0.12, PW 0.50.
Paralectotype minor: HW 0.42, HL 0.48, SL 0.42, EL 0.08, PW 0.28.
color Major: body and mandibles medium brown; other appendages dark yellow.
Minor: concolorous light brown.
Range Known only from the type locality.
figure Upper: lectotype, major. Lower: paralectotype, minor. ARGENTINA: Estacion Sosa, Entre Rios. Scale bars = 1 mm.
Collected most commonly using these methods: 3 times direct collection.
Elevations: collected from 80 - 180 meters, 134 meters average
Collect Date Range: collected between 1932-06-13 and 1997-01-14
Type specimens: Lectotype of Pheidole alacris: casent0913319; paralectotype of Pheidole alacris: casent0913320; syntype of Pheidole flavens mediorubra: casent0917769; syntype of Pheidole flavens mediorubra: casent0913321, casent0913322
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