Nicarchus enyalius Rehn (Ommatolampini: Vilernae) is synonomized with N. erinaceus Stål, leaving the genus monospecific. A redescription is given.

The previously unknown male of Cryptacris costaricensis Descamps & Rowell is described, and the genus redescribed; its probable position within the Vilernae is reaffirmed, and it is newly recorded from Panama as well as from Costa Rica.

A new species of Pauracris Descamps & Amedegnato, a genus previously known only from Colombia, is described from Caribbean Costa Rica (P. brachyptera). Christenacris Descamps and Rowell is provisionally transferred from the Ommatolampini to the Pauracrini.

A new subspecies of Ateliacris annulicornis (Bruner) (A. a. pulchra) (Syntomacrini: Caloscirtae) is described from Western Costa Rica. It differs from the nominate form principally in the coloration of the male.

The systematic position of Leptalacris Descamps & Rowell is reconsidered, and it is transferred from the Ommatolampinae: Clematodinini to the Eucopiocerae group.

One new species (jagoi) and one new subspecies (chrysonota salazari) of Rhachicreagra are described from Costa Rica (Abracrini). Additional notes on Rh. gracilis Bruner, drymocnemensis Jago & Rowell and dierythra Rowell are given.