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|Combination in Neivamyrmex (Neivamyrmex): Smith, 1942c PDF: 555; in Neivamyrmex: Borgmeier, 1953 PDF: 5.|
|Raised to species: Emery, 1900e: 186.|
Natural History: Also relatively common and well-known, the habits of N. opacithorax are quite similar to those of N. nigrescens. Males are bicolored, black with a reddish-brown gaster, and may be seen flying on calm, cool, sunny, late summer or early fall days.
|Neivamyrmex opacithorax||Ward, P. S., 2005, A synoptic review of the ants of California (Hymenoptera: Formicidae)., Zootaxa 936, pp. 1-68: -1, (download)||-1||21008|
|Neivamyrmex opacithorax||Snelling, G. C. & Snelling, R. R., 2007, New synonymy, new species, new keys to Neivamyrmex army ants of the United States., Advances in ant systematics (Hymenoptera: Formicidae): Homage to E. O. Wilson - 50 years of contributions. (Memoirs of the American Entomological Institute 80), pp. 459-550: 486-487, (download)||486-487||21290|
Found most commonly in these habitats: 1 times found in road edge in mesophyl forest, 2 times found in oak pine juniper woodland, 2 times found in 2º wet forest, 1 times found in grazed creosote desert, 1 times found in pine-oak forest, 2 times found in swamp forest, 1 times found in chaparral on gabbro, 1 times found in old sawdust amid slabs, north side of pile, 0 times found in Desert canyon forest, 1 times found in Dry Palmetto woods, ...
Found most commonly in these microhabitats: 1 times column on road, 2 times at bait, 3 times under stone, 1 times raiding column, 2 times sample from tree base, 1 times in dead wood below ground, 1 times night collecting; foraging column, 1 times in ant colony refuse under stone, 1 times Foraging under rock in partial shade. Sandy Soil. Dense shrubby cover <1m. tall., 1 times ex abandoned fire ant mound.
Collected most commonly using these methods: 5 times search, 2 times Baiting, 2 times Berlese, 1 times Raiding columns, 1 times Search, subterranean raid, 1 times Colony|in soil/night collecting, 1 times general collecting, 1 times Malaise trap, 0 times under rock.
Elevations: collected from 6 - 1960 meters, 1250 meters average
Type specimens: syntype of Eciton californicum opacithorax: casent0903735