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Species: Proceratium californicum   Cook, 1953 

Download Data

Taxonomic History (provided by Barry Bolton, 2021)

Proceratium californicum Cook, 1953 PDF: 45, fig. (m.) U.S.A. (California). Nearctic. Primary type information: Type-material: holotype male. Type-locality: U.S.A: California, Santa Cruz Mts, Glenwood, 27.v.1908. Type-depository: LACM. Type notes: Snelling, 1967 PDF: 2, stated that the holotype is “the property of the Snow Museum, Oakland, California” (now the Oakland Museum of California); but Ward, 1988 PDF: 112, records its presence in LACM. AntCat AntWiki HOL

Taxonomic history

Snelling, 1967 PDF: 4 (q.); Ward, 1988 PDF: 109 (w.).
Status as species: Brown, 1958g PDF: 247, 332; Smith, 1958c PDF: 111; Snelling, 1967 PDF: 2 (redescription); Smith, 1979: 1338; Brown, 1980c PDF: 343 (in key); Ward, 1988 PDF: 109; Bolton, 1995b: 366; Baroni Urbani & de Andrade, 2003a PDF: 243 (redescription); Ward, 2005 PDF: 38.
// Distribution


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

Distribution Notes:

Central and southern California. Endemic.


This rarely collected ant is known from valley oak (Quercus lobata) riparian woodland in the Central Valley and from adjacent foothill localities (oak woodland; chaparral; grassland). It is presumed to be a specialist, subterranean predator on spider eggs. Alates have been collected in April and May.


Worker: standing pilosity lacking on scape and legs; scape relatively long (SL/HL 0.76-0.80); eye vestigial, reduced to a fleck of dark pigment (no distinct ommatidium); petiole low and broad, with anterior and posterior faces converging on a rounded summit; length of abdominal sternite 4 (excluding the presternite) about 0.4 times that of the corresponding tergite.


Snelling (1967); Ward (1988).

Taxonomic Treatment (provided by Plazi)

Treatment Citation: Ward, P. S., 2005, A synoptic review of the ants of California (Hymenoptera: Formicidae)., Zootaxa 936, pp. 1-68

Proceratium californicum CookHNS 1953

E1 [endemic to California], E2 [endemic to California floristic province (Hickman, 1993)]

Specimen Habitat Summary

Found most commonly in these habitats: 3 times found in oak woodland, 3 times found in riparian woodland, 1 times found in in soil, 1 times found in oak savanna, 1 times found in open grassland, 1 times found in serpentine grassland.

Found most commonly in these microhabitats: 2 times sifted litter, 1 times sifted litter (leaf mold, rottenn wood), 1 times on moist sawdust pile, 1 times worker under stone, 1 times under stone, 1 times under log, 1 times under large rock.

Collected most commonly using these methods: 2 times search, 1 times hand collecting, 1 times midden.

Elevations: collected from 15 - 1050 meters, 438 meters average

Collect Date Range: collected between 1986-04-04 and 2019-04-27

Type specimens:

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