Key to species of Processa from the eastern Pacific

1. Pereopods 2 equal in length, carpus with 9-11 articles. Rostrum narrow, slender, bifid at apex ................................. Processa aequimana - Pereopods 2 not equal in length, right longer thanleft. Rostrum short, apexsimple..............2

2. Right carpus with 17-19 articles. Propodus of pereopods 5 with spines on flexor margin. Exopod of third maxilliped rudimentary ....................... Processahawaiensis - Right carpus with 49-55 articles. Propodus of pereopods 5 without spines on flexor margin. Exopod of third maxilliped well developed ........................... Processa peruviana