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Costa Rica (Atlantic lowlands).
This species occurs in young to mature forest. It is arboreal, and nests opportunistically in plant cavities such as hollow dead stems and ant-plant cavities.
Diagnosis A very small species, close to amazonicaHNS, mackayiHNS, minutulaHNS, and especially quercicolaHNS, distinguished in the major from these species by its subangulate (as opposed to lobate) humerus in dorsal-oblique view, rounded lateral borders of the postpetiole, and bicolorous head.
Measurements (mm) Holotype major: HW 0.76, HL 0.84, SL 0.40, EL 0.06, PW 0.40. Paratype minor: HW 0.42, HL 0.46, SL 0.40, EL 0.06, PW 0.26.
color Major: head capsule anterior to eyes, along with a fuzzy circular spot in the middle of the capsule dorsum, light brown. Waist and gaster also light brown; rest of body and appendages dark yellow. Minor: body medium brown, tarsi yellow, rest of appendages light brown.
Range Atlantic lowlands of Costa Rica, up to 500 meters elevation.
Biology John T. Longino (1997) reports arboricolaHNS as a resident of moist mature and second-growth forest, nesting in the hollow branches and under the dead bark variously of Bauhinia, Cecropia, Stryphnodendron, and other trees.
Figure Upper: holotype, major. Lower: paratype, minor. COSTA RICA: La Selva Biological Station, near Puerto Viejo (J. T. Longino). Scale bars = 1 mm.
Found most commonly in these habitats: 3 times found in wet forest, 2 times found in STR 2050, 1 times found in La Selva, 2 times found in lowland rainforest, 2 times found in montane wet forest, 2 times found in CCL 700m., 1 times found in roadside (edge of gardens), 2 times found in SAT, 2 times found in Entre LOC y SAT, 1 times found in Trampa #2, ...
Found most commonly in these microhabitats: 3 times NOTES FOR COLLECTIONS #3291-s TO #3315 WERE LOST. NOTES WERE RECONSTRUCTED FROM, 1 times ex Cordia alliodora, 1 times ex dead twig of small tree, 1 times ex Cecropia, 2 times Collecting in recent (< 1week) treefall. A large dead snag fell, bringing a lar, 1 times N-S leg of LEP; recent treefall; small Stryphnodendron and some other tree; the, 1 times canopy fogging sample, 1 times Ants from malaise trap set at LOC200 on 15 Oct, harvested 22 Oct., 1 times ALAS canopy fogging of Pentaclethra macroloba (Fabaceae), 1 times Sura, 1 times One of the ALAS fogging samples, from Pentaclethra macroloba crown., ...
Collected most commonly using these methods: 19 times Fogging, 4 times Search, 5 times Malaise, 1 times Foggin.
Elevations: collected from 50 - 835 meters, 129 meters average
Type specimens: holotype major Pheidole arboricola: inbiocri001237448; Paratype Pheidole arboricola: casent0610092, casent0610093, inbiocri001218024, inbiocri001218031, inbiocri001218049, inbiocri001218097, inbiocri001218129, inbiocri001238628, inbiocri001271993, inbiocri001271995, inbiocri001271996, inbiocri001271997, inbiocri001281161, inbiocri001281162, inbiocri001281163, inbiocri002279943, inbiocri002279945