Apterostigma urichi Forel guianense, Neal A. Weber, University of North Dakota, 1936

Neal A. Weber, University of North Dakota, 1936, The biology of the fungus-growing ants. Part. I. New forms. 1, Revista de Entomologia 7, pp. 378-409 : 393

Apterostigma urichi Forel guianense , var. nov.

Female (dealate): Length about 5.6 mm. - Differing from a topotype dealate female of the typical urichi in the greater development of the lobes of the anterior margin pi the pronotum, in the less convex declivous surface of the epinotum, which in the topotype urichi is almost tuberculate, in the less strongly marginate gaster, and in the more appressed pilosity, especially on the gaster, as compared with reclinate hairs. Color and size are similar.

Described from one female taken by myself July 20, 1936, by the Oronoque River near the junction with the New River, British Guiana. The ant was with her fungus garden, labout 10 mm. long, 2 mm. (deep, and 8 mm. wide, in a small cavity beneath rotten bark on a living tree at an elevation of 4 feet. No other Apterostigma were near and she was evidently starting a new colony independently.