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Costa Rica (southern Pacific lowlands).
This species is a moderately abundant element of the fauna in Corcovado National Park, but so far it is known only from Corcovado. Within Corcovado I collected it at Sirena, Los Patos, Los Planes, Cerro Rincon, and Llorona, so it is widely distributed on the Osa Peninsula. Three times I observed clusters of workers on inflorescences, once on Acanthaceae, once on Hamelia axillaris (Rubiaceae), and once on Melastomataceae. In the first two cases, the inflorescences also had abundant Membracidae and Coccoidea (scale insects). At Sirena I observed workers foraging parabiotically with Crematogaster carinata. The workers were together on low vegetation, moving together in columns and forming clumps of stationary workers. Thus D. inermis is probably parabiotic, much like D. debilis. The workers move very slowly and seem relatively passive, in contrast to many other species of Dolichoderus that either flee or aggressively attack in response to disturbance. The workers often move with their gasters twisted laterally, a distinctive posture I have also seen in some species of Myrmelachista.
Found most commonly in these habitats: 3 times found in rainforest, 1 times found in lowland rainforest, 1 times found in Plateau, 1 times found in rainforest stream edge.
Found most commonly in these microhabitats: 1 times Wet forest. Dolichoderus and Crematogaster parabiotica group; workers together o, 1 times on inflorescences of a melostome shrub, 1 times column, 1 times recent treefall, 1 times in inflorescences of Hamelia axillaris, with Hemiptera, 1 times Leaf litter, 1 times forager.
Collected most commonly using these methods: 1 times Pitfall72h, 1 times search.
Elevations: collected from 5 - 700 meters, 155 meters average