Klages's Antbird lives in montane forest from northern Venezuela to eastern Colombia. Pairs forage in bamboo and dense lower growth for insects and other small prey.
It has a long, white-tipped tail. Males are finely black-and-white streaked; females have a rufous head and back. Both sexes show rufous on the rump and belly and white spots on the wings.
Pairs move through dense understorey, often in bamboo thickets or along montane-forest edges. They seldom join mixed-species flocks and take insects; spiders are listed as likely prey.
An extinction-risk assessment has not been added yet.