Archbold's Newtonia is a small bird of dry spiny forest and shrubland in southern Madagascar. It searches for spiders and insects on low branches.
Rufous-brown color appears on the forehead and around the eye, while the head and back are greyish brown. The center of the chin and throat is buffy white; the breast and flanks are cinnamon buff, becoming paler on the belly.
It feeds on small arthropods such as spiders, beetles, bugs, and termites. It actively searches along branches of shrubs and low trees.
The eyes are pale whitish-yellow and the bill is black.
The upperwings and tail are grey-brown.
An extinction-risk assessment has not been added yet.