Handleyomys chapmani  Handleyomys chapmani, also known as Chapman's oryzomys or Chapman's rice rat, is a species of rodent in the genus "Handleyomys" of family Cricetidae. It is found only in Mexico. It was previously placed in "Oryzomys" as "Oryzomys chapmani", but has been provisionally transferred to the genus "Handleyomys" pending the description of a new genus to contain it. Chapman's rice rat was named after Frank Michler Chapman.