Abstract:
The material upon which this and other species in the same paper were based came from a German aquarist, Mr. E. Roloff, who also had sent a series of the same collection to one of us (Myers). We had studied an adult male and female of this species before Dr. Trewavas published on it, had determined that it was new, and had come to certain conclusions about its generic position. During the month of April, 1949, one of us (Rivas) had the opportunity to spend several days in the Dominican Republic collecting freshwater fishes, especially poeciliids, and the type locality of M. elegans was visited. Study of a fine series of topotypes shows that this species constitutes a remarkable new genus of the tribe Poeciliini that is apparently confined to the Island of Hisbody paniola.