Acromyrmex (Moellerius) balzani Emery planorum, subsp. nov. Worker: Length 2-7 mm. - Worker maxima: Head deeply incised, occipital angles rounded, with acute spine and about 5 low and inconspicuous tubercles. Antennal scapes reaching occipital angles. Dorsum of first gastric segment with large tubercles irregularly arranged but tending to be absent from the medial region, and a lateral region and tending to form lateral ridges. Head, except occipital region, sparsely rugulose. Thorax finely rugulose. Surface of body faintly pruinose. Hairs short, sparse, recurved. Ferruginous. Described from a colony taken by myself about 17 kilometers north of Ciudad Bolivar, on the llanos of Venezuela, January 27, 1935. This subspecies differs from the subspecies myersi in having longer antennal scapes, in arrangement of gastric tubercles, in sparser pruinosity, and in brighter color.

Published as part of Neal A. Weber, University of North Dakota, 1936, The biology of the fungus-growing ants. Part. I. New forms. 1, pp. 378-409 in Revista de Entomologia 7 on page 409