Three new <i>Pseudaptinus</i> (subgenus <i>Thalpius</i>) from Ecuador, with notes on <i>Pseudaptinus</i> (<i>Thalpius</i>)<i> aptinoides</i> Liebke

Pseudaptinus (Thalpius) bartolozzii n. sp., Pseudaptinus (Thalpius) moreti n. sp., and Pseudaptinus (Thalpius) gracilis n. sp., three new flightless species from Ecuador, are described. P. bartolozzii n. sp. shows a peculiar ant-like habitus; P. moreti n. sp. and P. gracilis n. sp. form, together with Pseudaptinus (Thalpius) aptinoides Liebke, a morphologically very homogeneous species group. Moreover, the holotype of P. aptinoides is illustrated, and a re-description of this species is given. Finally, a key to all species of Pseudaptinus subgenus Thalpius so far recorded from South America is provided.