Four new species of Litoblatta from Argentina with a key to species based on males (Blattaria: Ectobiidae: Blattellinae).

New diagnostic characters were used to study the genus Litoblatta Hebard: paraprocts, styles due to their shape and distribution of spines, and sclerites of the genitalia of the male with emphasis on the right complex. Male and female genitalia are described in detail. Four new species of cockroaches are described, Litoblatta elisae, Litoblatta lutea, Litoblatta misionerae, and Litoblatta tucumanae.

A new species of Tribonium Saussure, 1862 from the Province of Misiones, Argentina (Blattaria, Blaberidae, Zetoborinae).

Tribonium rothi sp. n. is described from Argentina, whereas T.