Species: Formica (rufa-group) obscuripes

Taxonomic History (provided by Barry Bolton, 2013)

Distribution:

NEARCTIC: United States: WA OR CA ID NV UT MT WY* CO NM ND SD WI IL; Canada: British Colombia, Alberta, Saskatchewan, Manitoba, Ontario. *The type specimen was collected in Wyoming. A collection of Formica obscuripes was made at Ft. Davis, TX by an unknown collector on 6Jun1902. Specimen from AMNH collection.

Biology:

Broad habitat preferences, an incomplete list includes: sagebrush steppe, prairie, hardwood forest, and mixed coniferous forest. This species as currently conceived, besides have broad habitat preferences, has high variability in coloration, from mostly red (black gaster) to almost completely infuscate black (head orange). Like many other Formica, F. obscuripes primarily tends hemipterans on vegetation.

Identification:

Head as broad as long; scapes not covered in erect setae; setae present on lateral corners of headcapsule; setae present on pronotum, mesonotum and propodeum; erect setae present on femora and on tibiae in addition to ventral double row. Makes more-or-less dome-shaped thatch-mounds of organic debris.
The current concept of F. obscuripes allows for variation in length and density of setae and pubescence on all abovementioned surfaces. In the Great Plains and Pacific Northwest, majors are somewhat infuscated, while minors are completely dark.

Comments:

Check Alex Wild's determination of some northern California material as F. planipilis. Also note that McIver & Loomis (1993. Insectes Sociaux 40:207-218) record "Formica planipilis" from SNARL, near Mammoth. I think that these two taxa may be conspecific.

Taxon Page Author History

Taxonomic Treatment (provided by Plazi)

Specimen Data Summary

Found most commonly in these habitats: 11 times found in shrub steppe, 6 times found in conifer forest, 3 times found in coastal dunes/shorepines, 2 times found in peak bald at treeline, 1 times found in grass, sage, bare soil, 2 times found in aspen forest, 1 times found in treeline with Abies, Vaccinium, 1 times found in grassland, sparse cottonwood, 1 times found in aspen, fir, meadow, 1 times found in lodgepole pine forest, ...

Collected most commonly using these methods or in the following microhabitats: 62 times search, 1 times observation, 1 times Winkler

Elevations: collected from 5 - 2720 meters, 901 meters average

3 Specimens Imaged | View All 160 Specimens for this species

CASENT0005389

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CASENT0179852

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CASENT0280401

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