Camponotus semitestaceus

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Camponotus semitestaceus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Camponotini
Genus: Camponotus
Species: C. semitestaceus
Binomial name
Camponotus semitestaceus
Snelling, R.R., 1970

Camponotus semitestaceus casent0005352 profile 1.jpg

Camponotus semitestaceus casent0005352 dorsal 1.jpg

Specimen labels

Nests are found under stones or in the soil, surrounded by a small mound (few cms up to 30 cms in diameter). The colonies are large with many majors. Workers are active during the night or during cooler times of the day, and tend Homoptera. Nest density can be very high. (Mackay and Mackay 2002)



Western United States as far east as Oklahoma, south to northern Mexico.

Distribution based on Regional Taxon Lists

Nearctic Region: United States (type locality).
Neotropical Region: Mexico.

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb


Pinyon juniper forests.


In New Mexico (Mackay and Mackay 2002) brood was found in a nest in May; reproductives were found in nests in September. The scarabaeid beetle Cremastocheilus planatus and the ant cricket Myrmecophilus oregonensis occur in nests.

Nevada, Wheeler and Wheeler (1986) - We have 90 records from 67 localities, all but 1 of which are south of the 40th Parallel; 3,000-7,700 ft. Seventeen records were in the Cool Desert (1 in a Sarcobatus Subclimax, 1 in a cottonwood grove, 2 in buildings, 1 in a fence post, 1 among roots of a plant); 41 were in the Pinyon-Juniper Biome. Eighteen nests were under stones, 8 in exposed soil with craters 5-20 cm in diameter, 12 exposed and surmounted by irregular piles of soil, 2 in rotten wood. Entrances were large (10 mm in diameter). Larvae of Pseudomorpha sp. (Coleoptera: Carabidae; det. T.L. Erwin) were in nests. A pupa of Coniontis sp. was found in a nest. Araeoschizus armatus Hom (both Coleoptera: Tenebrionidae; det. T.J. Spilman).




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

  • semitestaceus. Camponotus (Tanaemyrmex) semitestaceus Snelling, R.R. 1970: 396 (w.) U.S.A. [First available use of Camponotus maculatus subsp. vicinus var. semitestaceus Emery, 1893i: 672; unavailable name.]

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


Type Material

Wheeler (1910) - Described by Emery from a couple of workers from Plummer County, Calif., 5000 ft. (Theo. Pergande).


  • Emery, C. 1893k. Beiträge zur Kenntniss der nordamerikanischen Ameisenfauna. Zool. Jahrb. Abt. Syst. Geogr. Biol. Tiere 7: 633-682 (page 672, First available use of Camponotus maculatus subsp. vicinus var. semitestaceus; unavailable name)
  • Mackay, W. P. and E. Mackay. 2002. The ants of New Mexico (Hymenoptera: Formicidae). Edwin Mellen Press, Lewiston, NY.
  • Snelling, R. R. 1970. Studies on California ants, 5. Revisionary notes on some species of Camponotus, subgenus Tanaemyrmex (Hymenoptera: Formicidae). Proc. Entomol. Soc. Wash. 72: 390-397 (page 396, worker described)
  • Wheeler, G. C. and J. Wheeler. 1986. The ants of Nevada. Natural History Museum of Los Angeles County, Los Angeles.