Pseudomyrmex acanthobius (Emery 1896b) .

Pseudomyrma acanthobia Emery 1896b: 628 . [w syntypes examined, MCSN, MHNG; Paraguay (Bohls)].

Pseudomyrma acanthobia var. fuscata Emery 1896b: 629 . NEW SYNONYMY. [w syntypes examined, MCSN, MHNG; Paraguay (Bohls)].

Pseudomyrmex acanthobius (Emery) . Kusnezov 1953: 214.

Pseudomyrmex acanthobius var. fuscatus (Emery) . Kempf 1972: 215.

Pseudomyrmex acanthobius, a small pallidus- group species with large eyes and a relatively swollen fore femur, has been recorded sporadically from Paraguay nesting in Acacia thorns. Emery described both P acanthobius and P. acanthobius var. fuscatus in the same paper (Emery 1896b), distinguishing the two forms on the basis of color. The collections I have seen of this species can vary from orange-yellow to dark brown. Phil Ward, who is currently revising Pseudomyrmex, has examined Emery’s types and my recent Paraguayan collections and concluded that the color variation is intraspecific. As there are no other characters that reliably differ between the forms, I see no reason to dissent from Ward’s assessment.