The Rice Rats of North America: (Genus Oryzomys)

adult topotypes alfaroi group Allen altitudinal range anteriorly Biological Survey collection blackish bombycinus brownish buffy caliginosus chapmani characters characters.-Size Chiapas collected by E. W. Color.-Fresh pelage Costa Rica cranial darker dentition E. W. Nelson ears enamel island Field Mus figs frontal region fulvescens genus Geographic Greatest length Guatemala hairs hind foot Hist Honduras Humid Lower Tropical hypocone interorbital breadth interparietal Jalisco July 26 less Lower Tropical Zone Measurements.-Type melanotis Merriam mexicanus nasals National Museum Nectomys Nelson and E. A. Nicaragua Oaxaca ochraceous-buff ochraceous-tawny Oligoryzomys Oryzomys alfaroi ORYZOMYS COUESI Oryzomys melanotis palatal bridge palatine foramina paler Panama pelage posteriorly Proc Puebla reentrant reentrant angle rhabdops RICE RAT rostratus Skull average species subgenus subspecies supraorbital supraorbital ridges Tabasco tail vertebræ talamanca Tamaulipas tawny tectus Total length type and topotypes type locality Type.-No underparts United States National upper molar series Upperparts usually Vera Cruz whitish width of braincase Zool zygomatic breadth