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Published online by Cambridge University Press: 31 May 2012
The most recent list of the North American species of Orenaia was given by McDunnough (1939: 14), who referred two species to the genus. In the present paper two nominal species are transferred from Titanio to Orenaia, one as a synonym, and a new species of Orenaia is described.
Titanio and Orenaia agree in the reduced eyes, stout build, hairy vestiture, and noctuid-like facies. However, as was first shown by Müller-Rutz (1929), the genitalia of Orenaia are indistinguishable from those of Evergestis, whereas those of Titanio are of a very different type. The similarity in habitus of the two genera is undoubtedly the result of convergence.