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Colombia, Costa Rica, Panama (type locality). Costa Rica: Atlantic lowlands.
Arboreal; nesting in small cavities in live plant stems.
Types Mus. Hist. Nat. Geneve.
Diagnosis One of the most distinctive of all PheidoleHNS species, marked by extremely small size, greatly elongated head of the major, and almost complete lack of carinulae anywhere on the bodies of major and minor, even around the antennal fossae and on the metapleural gland bulla. In some series at least, majors have faint longitudinal carinulae on the frontal lobes, and both castes have a few such traces on sides of the head anterior to the eyes.
Measurements (mm) Syntype major: HW 0.34, HL 0.40, SL 0.34, EL 0.06, PW 0.24. Minor not measured.
Color Major: concolorous medium yellow. Minor: concolorous pale yellow.
Biology In Costa Rica, christopherseniHNS has been found in rainforest to 600 m, and in Colombia once in seasonal dry forest. This bizarre little species is strictly arboreal so far as is known. The type colony was nesting in a "very thin hollow stem" (Forel). Longino (1997) reports colonies from Costa Rica in the live, hollow stems of Bauhinia vines (a legume), as well as in a bignoniaceous liana, a small tree, and Cecropia saplings.
Figure Upper: syntype, major. Lower: syntype, minor. PANAMA. Scale bars = 1 mm.
Found most commonly in these habitats: 4 times found in mature wet forest, 9 times found in montane wet forest, 2 times found in moist forest, 1 times found in wet forest, 1 times found in Primary forest at river edge, 1 times found in dry forest, 1 times found in wet forest edge, 2 times found in tropical rainforest, 2 times found in tropical rainforest, old second growth, 1 times found in Entre LOC y SAT, ...
Found most commonly in these microhabitats: 4 times ex live stem Myriocarpa, 2 times nest in live stems Myriocarpa, 1 times NOTES FOR COLLECTIONS #3291-s TO #3315 WERE LOST. NOTES WERE RECONSTRUCTED FROM, 1 times in live stem Bignoniaceae liana, 1 times in live stems, 1 times In Cecropia peltata sapling, 1 times in Cecropia insignis sapling, 3 times beating vegetation, 3 times beating veg., 2 times Malaise trap, 2 times copa de árbol, ...
Collected most commonly using these methods: 6 times search, 6 times beating, 6 times Malaise, 5 times Foggin, 4 times Fogging.
Elevations: collected from 50 - 800 meters, 297 meters average