"Stem rarely exceeding 9 cm. in height, relatively robust. Leaves sessile, stem-clasping, their margins often but not invariably much undulate-crisped. Dorsal sepal narrowly cuneate with a short point. Lateral sepals narrow-linear, spreading, sometimes recurved. Petals broad-linear, spreading or almost erect. Expanded lamina of the labellum almost rhomboid, but occasionally rounded in front, with a short point. Calli numerous, chiefly in two groups, one towards the claw and one on the anterior half extending to the apex; the posterior calli including several insectiform ones, one very large and double-headed, resembling an ant; the anterior calli small. Column-wings broader than [ and ], not as high as the anther. Fl. chiefly Sept."