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<div>We describe Cistothorus apolinari hernandezi, subsp. nov. from wet páramo of the</div><div>Sumapaz massif south of Bogotá, Colombia. This form differs from the nominate of</div><div>the wetlands of the Cundinamarca-Boyacá Plateau in size, coloration, ecology, social</div><div>structure and song and appears to be isolated from it by some 1000 m of elevation</div><div>and different habitat preferences. A second population apparently occurs some 300</div><div>km further northeast in the Sierra Nevada del Cocuy in Dept. Boyacá but no data</div><div>exist for intervening páramos. As a species, C. apolinari is critically endangered</div><div>but the wetland and páramo populations face different threats and require different</div><div>conservation strategies; distinguishing the latter population formally helps call</div><div>attention to this situation.</div>