Pseudomyrmex rufomedius

Identification
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.

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

Distribution based on Regional Taxon Lists
Neotropical Region: Guatemala, Mexico.

Nomenclature

 *  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 [Examined].

Pseudomyrma stolli Forel, 1912:20. Syntype worker, queens, male, Retalhuleu, Guatemala (Stoll) [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).

References based on Global Ant Biodiversity Informatics

 * Kempf, W.W. 1972. Catalago abreviado das formigas da regiao Neotropical (Hym. Formicidae) Studia Entomologica 15(1-4).