Discothyrea The three hitherto known New World species of Discothyrea and the three species described below may be separated by means of the following key: 1. Antennae nine-jointed................................................ 2 Antennae seven-jointed............................................... 3 2. Length of female 1.2 mm. Costa Rica.......................horni Menozzi Length of female 2 mm., worker 1.5 mm. "North America"....testacea Roger 3. Clypeal lamina between the antennal bases bearing a denticle, worker 1.0 mm. British Guiana..............................denticulata Weber Clypeal lamina not toothed............................................ 4 4. Length of female 1.8 mm. Argentina.....................neotropica Bruch Length of female 1.1-1.2 mm.......................................... 5 5. Ventral lamina of petiole with right posterior angle, petiole 0.19 mm. high, node of petiole more sharply angulate above, color lighter. Panama, humilis Weber Ventral lamina of petiole with acute posterior angle, petiole 0.21 mm. high, node of petiole more rounded above, color darker. Trinidad....icta Weber

Published as part of Weber, N. A., 1939, New ants of rare genera and a new genus of ponerine ants., pp. 91-104 in Annals of the Entomological Society of America 32 on page 99