21. Cryptocerus causticus ^HNS.

Formica caustica, Pohl & Kollar ^HNS, Bras. Ins. 17-1.. f. 12 [[worker]].

Cryptocerus causticus ^HNS, Guer. Icon. Reg. Anim. 426.

Smith, Mon. Crypt. Trans. Ent. Soc. Lond. 2nd ser. ii. 222.24.

Hab. Brazil.