Formica occulta

Nests are usually found under stones, but may be located under logs, or simply in the soil, in fine sand, loam soils, to rocky loam. All nests had only a single gyne. They are very fast, and rescue brood when the nest is disturbed. Workers from larger nests are moderately aggressive. Black or nearly black, with abundant appressed pilosity. The pilose lobes on the metasternum are always developed and surrounded with abundant, erect hairs. (Mackay and Mackay 2002)

Identification
Black or nearly black, with abundant appressed pilosity. The pilose lobes on the metasternum are always developed and surrounded with abundant, erect hairs. (Mackay and Mackay 2002)

Distribution
United States: Oregan, Wyoming, Utah, Colorada, Arizona and New Mexico. Mexico, Chihuahua.

Distribution based on Regional Taxon Lists
Nearctic Region: United States. Neotropical Region: Mexico.



Habitat
In New Mexico (Mackay and Mackay 2002) - Pinyon-juniper, sagebrush communities, oak forests, ponderosa pine-riparian; aspen, fir, spruce, and residential areas.

Biology
For New Mexico (Mackay and Mackay 2002) - Brood was found in nests from June to August, sexuals in late June to July. Dealate females were collected in late June and early July. A mating flight occurred the night of 12-vii-1986, sexuals were attracted to a blacklight trap. Dealate females were found in August, two new females were found nesting together (two separate times, one with brood present). One colony was nesting together with Lasius sitiens, a second nest was together with Myrmica hamulata, another with Formica lasioides, a fourth with Solenopsis salina. One nest also contained Acanthomyops latipes(=Lasius latipes), Lasius sitiens and Myrmica hamulata. It is a host of the cricket Myrmecophila sp., and is parasitized by Polyergus breviceps.

Nomenclature

 *  occulta. Formica occulta Francoeur, 1973: 94, figs. 132-147 (w.q.m.) U.S.A.