- Order: Passeriformes
- Family: Thamnophilidae
Padilla, La Paz, Bolivia, 31 March 2005 © Joe Tobias
Also known as the Yungas Antwren, this species was formerly considered Vulnerable, but has recently been re-analysed on the basis of more robust distributional data, and is now treated as Near Threatened. The Ashy Antwren is entirely uniform grey, with unmarked wing coverts in males, whilst females are olivaceous-brown above with more rufescent unmarked wings and tail, and uniformly bright ochraceous underparts. It is restricted to the east Andean foothills of La Paz, Cochabamba, and Santa Cruz departments, in central and western Bolivia, and has recently been found in extreme southwest Puno, in Peru, always in foothill forest (of varying types) with a dense, structurally complex understory, often with Chusquea bamboo thickets, at 600–1500 m, i.e. above the upper limits of its congeners, the White-flanked Antwren (Myrmotherula axillaris), and the Gray Antwren (Myrmotherula menetriesii).
. 2010. Ashy Antwren (Myrmotherula grisea), Neotropical Birds Online (T. S. Schulenberg, Editor). Ithaca: Cornell Lab of Ornithology; retrieved from Neotropical Birds Online: http://neotropical.birds.cornell.edu/portal/species/overview?p_p_spp=378291