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Taxonomic History (provided by Barry Bolton, 2019)

Distribution:

  Geographic regions (According to curated Geolocale/Taxon lists):
    Americas: United States
  Biogeographic regions (According to curated Bioregion/Taxon lists):
    Nearctic

Identification:

Buren (1968) notes the subpetiolar process of this species as "strikingly large," a character in combination with a postpetiole which is wider anteriorly and has straight sides, which sets C. mutans from the rest of the western Crematogaster.

Taxonomic Treatment (provided by Plazi)

Specimen Habitat Summary

Found most commonly in these habitats: 4 times found in Sarcobatus scrub, 2 times found in chaparral on serpentine, 2 times found in pinyon pine/sagebrush, 2 times found in sagebrush scrub, 2 times found in sagebrush-riparian vegetation, 2 times found in oak woodland, 2 times found in sagebrush, 2 times found in sandy desert, 1 times found in grassland, 1 times found in juniper woodland.

Found most commonly in these microhabitats: 7 times at light, 4 times under stone, 1 times tending homoptera at base of plant, 1 times on low vegetation, 30-10 times at uv-light, 9, 1 times at blacklight, 1 times ex Veromessor andrei nest midden, 00-10 times at uv light, 9, 1 times tending homoptera at base of Ephedra, 1 times outside Formica ravida nest, 1 times ground forager(s), ...

Collected most commonly using these methods: 4 times search, 4 times at light, 3 times collected at uv-light, 1 times beating vegetation (2 hours), 1 times blacklight, 1 times u-v light, 00-10 times at uv light, 9, 1 times hand collecting.

Elevations: collected from 400 - 2256 meters, 1372 meters average

Type specimens: Paratype Crematogaster mutans: casent0616047, casent0616048, casent0616049, casent0616050, casent0616051, casent0616052, casent0616053, casent0616054, casent0616055; paratypes of Crematogaster mutans: casent0863154

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