(Rhinocryptidae; Ϯ Rusty-belted Tapaculo L. thoracicus) Gr. λειος leios smooth; σκελος skelos shin, leg; "PTEROPTOCHUS THORACICUS, sp. nov. ... The tarsi are rather shorter and by no means so strong as in P. albicollis, and their anterior surface, so far as I can judge from my single specimen (the feet of which are not in very good order), nearly smooth, the divisions of the scutella being obsolete, if not imperceptible. The claws are short and curved, as in other members of the genus. ... On the whole, the form is subgenerically (if not generic ally) distinct, and may stand as a separate section (for which I propose the name Liosceles *) to connect Pteroptochus with Agathopus. ... * λειος, lævis, et σκελος, crus." (P. Sclater 1865); "Liosceles Sclater, Proc. Zool. Soc. London, 1864 (1865), p. 610. Type, by monotypy, Pteroptochos thoracicus Sclater." (Peters 1951, VII, 280).