Dorsal view of mesosoma for A Ancistrocerus bustamente (de Saussure) female, with parategulae of mesonotum narrowed, and humeral angle obtuse and not projecting B A. epicus (Zavattari) female, with parategulae of mesonotum broadly flattened, and humeral angle approximately a right angle and projecting bluntly C A. sur sp. n. female, with parategulae broad and humeral angle acute and projecting sharply. Dorsoposterior view of propodeum and T I for D A. bustamente (de Saussure) female, with propodeal dorsal carina complete E A. similis (Smith) male, with propodeal dorsal carinae incomplete F A. flavomarginatus (Brèthes) female, without propodeal dorsal carina and T I with carina well developed dorsally; and G A. sur sp. n. female, without propodeal dorsal carina and tergum I with carina effaced dorsally. pt = parategula; hum = pronotal humeri; pdc = propodeal dorsal carina; tc= T I carina.