Key to the species of Olivensa Lane, 1965

1. Head testaceous with homogeneous pilosity density; Bolivia, Brazil (Amapá, Amazonas, Pará), French Guiana .............................. Olivensa cephalotes (Pascoe, 1858)

— Head black with glabrous area at vertex............................................ 2

2(1). Base of scape and femora testaceous, tibiae black; Brazil (Amazonas) Olivensa mimula Lane, 1965 — Antennae and legs entirely black, except apex of tarsi................................. 3

3(2). Thorax black with squamous, orange pilosity laterally and tufts of whitish pilosity at anterior margin and metepimera laterally, near basal margin centrally; Bolivia, Brazil (Amazonas), Ecuador, French Guiana ..................... Olivensa megacephala (Bates, 1866)

— Thorax entirely testaceous-orange with sparse pilosity; French Guiana ..................................................... Olivensa sonzognii Dalens and Robin, sp. nov.