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Costa Rica (Atlantic slope to 1000m).
Inhabits wet forest leaf litter; nests in soil or in dead wood on ground.
Types Mus. Comp. Zool. Harvard.
Etymology Named in memory of William L. Brown, pioneering systematist of the world ant fauna.
Major: distinguished by an elongated head, shallow antennal scrobes, 3-lobed promesonotum in dorsal-oblique view, large propodeal spines, and foveolate and opaque dorsal head surface.
Minor: propodeal spines long and thin; humerus in dorsal-oblique view toothed; dorsal head surface foveolate and opaque; eyes very large, anteriorly tapered.
Measurements (mm) Holotype major: HW 0.64, HL 0.76, SL 0.34, EL 0.12, PW 0.40.
Paratype minor: HW 0.36, HL 0.38, SL 0.32, EL 0.10, PW 0.26.
color Major: concolorous light reddish yellow, with only a slight tinge of red.
Minor: concolorous dark yellow.
Range Atlantic slope of Costa Rica up to 1100 m (J. T. Longino 1997).
biology Longino (1997) reports that browniHNS nests in soil or in dead wood on the ground in wet forest. The species is captured frequently in Winkler samples. Longino observed a raid on a colony by SimopeltaHNS in the Braulio Carillo National Park at 1100 m elevation, in dense second-growth forest along a stream bank. Stefan Cover (personal communication) located five colonies in primary and secondary lowland rainforest at the type locality, nesting on the forest floor in rotten sticks and, in a single case, a rotten nut husk. Some of the colonies were spread over more than one nest site, and four of the five nests contained seed caches. Winged queens were present in nests at La Selva in March.
Figure Upper: holotype, major. Lower: paratype, minor. COSTA RICA: La Selva Biological Station, near Puerto Viejo, Heredia (Stefan Cover). Scale bars = 1 mm.
Found most commonly in these habitats: 368 times found in cloud forest, 306 times found in montane wet forest, 274 times found in mesophyll forest, 219 times found in ridgetop cloud forest, 109 times found in mesophil forest, 89 times found in mature wet forest, 86 times found in tropical wet forest, 79 times found in lowland rainforest, 54 times found in montane rainforest, 34 times found in tropical rainforest, ...
Found most commonly in these microhabitats: 918 times ex sifted leaf litter, 698 times at bait, 106 times Hojarasca, 2 times bajo de M/08, 1 times sifted leaf litter, 5 times nest, 1 times in dead stick, 2 times forest litter, 1 times ex sifted leaf litter on ground, 1 times foragers, 3 times ex pan trap, ...
Collected most commonly using these methods: 795 times miniWinkler, 704 times baiting, 104 times Mini Winkler, 106 times MaxiWinkler, 28 times Winkler, 28 times Berlese, 16 times search, 12 times Flight Intercept Trap, 4 times Pan Trap, 1 times bait, 3 times beating, ...
Elevations: collected from 30 - 2020 meters, 1020 meters average