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Waste heaps of Atta are host to an extraordinary diversity of myrmecophiles insects and other arthropods. In this study, the presence of four species of pseudoscorpions is recorded in two Atta colombica waste heaps in the years 2016 and 2017. Two of these species, Cordylochernes scorpioides and Lustrochernes carolinensis are new records in waste heaps and except for the deutonymphs of L. carolinensis, the others all stages of post-embryonic development were present in the studied heaps, which could indicate that these two species carry out their entire life cycle in these waste mounds and live there permanently.

Some species of pseudoscorpions perform a mechanism known as phoresy, attach themselves to other organisms for transportation. In this work, Americhernes oblongus (Pseudoscorpiones: Chernetidae) is reported as a phoront on a species of fly belonging to the genus Scipopus (Diptera: Micropezidae). A. oblongus is a new record for Panama and was collected in the town of Pirre, Province of Darien. The pseudoscorpion was found attached to the coxa of the right hind leg of the fly. To our knowledge, there are no previous reports of phoresy between A. oblongus and Scipopus sp. as a dispersal method.