Pheidole alacris

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Pheidole alacris
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Pheidole
Species: P. alacris
Binomial name
Pheidole alacris
Santschi, 1923

Pheidole alacris casent0913319 p 1 high.jpg

Pheidole alacris casent0913319 d 1 high.jpg

Specimen Labels


This species is only known from type specimens. Nothing is known about its biology.


See the description in the nomenclature section.

Keys including this Species


Only known from the type locality.

Distribution based on Regional Taxon Lists

Neotropical Region: Argentina (type locality).

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb







The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • alacris. Pheidole flavens st. alacris Santschi, 1923d: 61 (s.w.) ARGENTINA. Raised to species and senior synonym of mediorubra: Wilson, 2003: 366.
  • mediorubra. Pheidole flavens var. mediorubra Santschi, 1933e: 107 (s.w.) ARGENTINA. Junior synonym of alacris: Wilson, 2003: 366.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.


From Wilson (2003): Similar in various traits to Pheidole atticola, Pheidole dinophila, Pheidole hazenae, Pheidole lucaris and Pheidole ulothrix, 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.

Pheidole alacris Wilson 2003.jpg

Figure. Upper: lectotype, major. Lower: paralectotype, minor.

Type Material

ARGENTINA: Estación Sosa, Entre Rios. Naturhistorisches Museum, Basel - as reported in Wilson (2003)


L alacris, active, eager.


  • Santschi, F. 1923d. Pheidole et quelques autres fourmis néotropiques. Ann. Soc. Entomol. Belg. 63: 45-69 (page 61, soldier, worker described)
  • Wilson, E. O. 2003. Pheidole in the New World: A dominant, hyperdiverse ant genus. Harvard University Press, Cambridge, MA. (page 366, Raised to species; senior synonym of flavens mediorubra; fig. major, minor described)