Formicoxenus hirticornis

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Formicoxenus hirticornis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Formicoxenus
Species: F. hirticornis
Binomial name
Formicoxenus hirticornis
(Emery, 1895)

Formicoxenus hirticornis casent0103494 profile 1.jpg

Formicoxenus hirticornis casent0103494 dorsal 1.jpg

Specimen labels


This ant is a guest or xenobiont in the nests of Formica ciliata, Formica obscuripes, Formica ravida (based on MCZC specimens) and possibly Formica integroides.

At a Glance • Xenobiotic  



The eyes have several erect hairs and the clypeus of the worker is weakly depressed in the middle near the anterior border of the clypeus, and is without a medial carina, although several poorly developed lateral carinae are present. The propodeal spines are well developed, and thickened throughout. The anterior face of the petiole meets the dorsum in an angle, the posterior face is convex and rounded. The dorsum of the postpetiole is completely covered with punctures. The mesosoma has dense punctures. (Mackay and Mackay 2002)

Keys including this Species


North and South Dakota, south to Colorado, west to California.

Distribution based on Regional Taxon Lists

Nearctic Region: Canada, United States (type locality).

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb


Pine forest





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

  • hirticornis. Leptothorax (Leptothorax) hirticornis Emery, 1895c: 319 (w.) U.S.A. Smith, M.R. 1939c: 176 (q. ergatoid); Snelling, R.R. 1965a: 18 (q.m. ergatoid). Combination in L. (Mychothorax): Emery, 1924d: 262; in Mychothorax: Ruzsky, 1936: 96; in Formicoxenus: Buschinger, 1979a: 61. Senior synonym of formidolosus: Smith, M.R. 1939c: 177. See also: Wheeler, W.M. 1903c: 224; Francoeur, Loiselle & Buschinger, 1985: 382.
  • formidolosus. Leptothorax (Mychothorax) hirticornis var. formidolosus Wheeler, W.M. 1915b: 415 (w.q.) U.S.A. Junior synonym of hirticornis: Smith, M.R. 1939c: 177.

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


Type Material

Wheeler (1903) - Washington D.C. (Pergande). Described from a single specimen in the collection of Prof. Emery.