No. 8. — Mammals from Darirn. By Glover ]M. Allen and Thomas Barbour. In a previous paper (Bangs and Barbour, 1922) are listed the birds brought back from eastern Panama by the junior author and W. S. Brooks during a brief sojourn (^March to ^Nlay, 1922) in that country. This article gives an account of the expedition and a sketch of the conditions obtaining in the country traversed. In addition to other vertebrates (see Barbour, 1923), nearly one hundred mammals were collected, two of which represent hitherto undescribed forms. In as much as the publication of Major Goldman's (1920) excellent treatise on the mammals of Panama has laid such a satisfactory basis for further investigation, it seems worth while to publish a list of the species found by the expedition together with brief field ijotes. Of especial interest is the meeting of North American and South American types. Thus the discovery of a small Urocyon in the savannas of Panama adds a genus hitherto unreported from the isthmus south of Costa Rica, although its presence was to have been surmised from the fact of its recent and unexpected discovery in Venezuela. On the other hand the capture of a new species of Oecomys in the forest of eastern Panama, not only adds another genus to the known Pana-manian fauna, but serves to link it with that of South America. Two genera of bats are also now definitely recorded for Panama, though both have pre\'iously been taken farther northward in Central Amer-ica, namely, Noctilio and Thyroptera, the latter represented by a species very little knowTi. Press of time prevented the preparation of large series of many species which would have been easily obtainable. 1. Chironectes panamensis Goldman. Panama Water Opossum. The Zorro de Agua was \ery rare in the Sambii valley. It was met with but once, in the course of night hunting with a lamp. Unlike most Neotropical marsupials it was very active and although wounded, quickly made its escape among the great rock piles at the foot of a cliff beside the Rio Jesusito. All agreed that it was a rare species and but seldom killed bv the Chocoano Indians.