Pseudomyrmex rufomedius

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Pseudomyrmex rufomedius
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Pseudomyrmecinae
Genus: Pseudomyrmex
Species: P. rufomedius
Binomial name
Pseudomyrmex rufomedius
(Smith, F., 1877)

Pseudomyrmex rufomedius casent0902925 d 1 high.jpg

Specimen Labels



Ward (1989) - Workers and queens possess a broad head with relatively small eyes; a flattened and laterally marginate pronotum; a more or less apendunculate petiole, much longer than high or wide, whose dorsal face is also flattened and laterally margined; very fine, pale, inconspicuous pilosity; and a bicolored body (orange petiole contrasting with dark brown head and gaster; remainder of body variably infuscated). An additional characteristic feature of the worker is the virtual obliteration of the metanotal groove, the mesonotum and propodeum forming a continuous, elevated, and laterally compressed plate.


Known only from Guatemala and southern Mexico (Ward 1989).

Distribution based on Regional Taxon Lists

Neotropical Region: Guatemala (type locality), Mexico.

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.

  • rufomedius. Pseudomyrma rufomedia Smith, F. 1877b: 66 (q.) GUATEMALA. Combination in Pseudomyrmex: Wheeler, G.C. & Wheeler, J. 1956: 386. Senior synonym of stolli: Ward, 1989: 443. See also: Kempf, 1960a: 7.
  • stolli. Pseudomyrma stolli Forel, 1912g: 20 (w.q.m.) GUATEMALA. Combination in Pseudomyrmex: Kempf, 1972a: 224. Junior synonym of rufomedius: Ward, 1989: 443.


Type Material

Syntype alate queen (unique). Aceituno, Guatemala (The Natural History Museum) [Examined].

Pseudomyrma stolli Forel, 1912:20. Syntype worker, queens, male, Retalhuleu, Guatemala (Stoll) (Musee d'Histoire Naturelle Genève) [Examined].

The P. rufomedius type, although lacking a head, agrees closely with the worker-associated queens of P. stolli (and other material which I have examined), and there can be no doubt about the identity of the species (cf. Perrault, 1987).


  • Kempf, W. W. 1960a. Estudo sôbre Pseudomyrmex I. (Hymenoptera: Formicidae). Rev. Bras. Entomol. 9: 5-32 (page 7, see also)
  • Smith, F. 1877b. Descriptions of new species of the genera Pseudomyrma and Tetraponera, belonging to the family Myrmicidae. Trans. Entomol. Soc. Lond. 1877: 57-72 (page 66, queen described)
  • Ward, P. S. 1989a. Systematic studies on pseudomyrmecine ants: revision of the Pseudomyrmex oculatus and P. subtilissimus species groups, with taxonomic comments on other species. Quaest. Entomol. 25: 393-468 (page 443, Senior synonym of stolli)
  • Wheeler, G. C.; Wheeler, J. 1956. The ant larvae of the subfamily Pseudomyrmecinae (Hymenoptera: Formicidae). Ann. Entomol. Soc. Am. 49: 374-398 (page 386, larva described)