New Haven, CT, American Academy of Arts and Science, 1930. 8vo (23.5 x 15.2 cm). 151 pp.; eight plates. Original printed wrappers.

A major monograph of this ant genus. A few species are new. Published in the Academy's Proceedings, as Vol. 66 No. 2, but as "stand alone" work, with its own title page, page and plate numbering (both starting at 1) and wrappers. Stamp of a Dutch geologist on the front wrapper and title page top margin, otherwise a very good, clean copy. Very uncommon. Creighton not in Mallis, American Entomologists (1971).