BREVIORA Mnaseiam of Compsirative Zoology Cambridge. Mass. 30 November, 1970 Number 361 ADDITIONS TO KNOWLEDGE OF THE ARGYROLAGIDAE (MAMMALIA, MARSUPIALIA) FROM THE LATE CENOZOIC OF ARGENTINA GEORGE GAYLORD SIMPSON Abstract. A recent monograph of the Argyrolagidae is supplemented by observations on specimens not previously seen by the author. The holotype of Argyrolagiis palineri confirms previously published data. An additional specimen of Argyrolagiis scagliai adds to i<nowledge of the coronal pattern of lower molars. Argyrolagiis parodii is a hitherto dubious species the holotype of which was destroyed. A second specimen is made neotype; it validates the species and permits redefinition. A monograph of the Argyrolagidae (Simpson, 1970) was com-pleted early in 1968 and an addendum included late in that year. Early in 1970 a visit to Argentina made possible the study of several specimens not available or not known to me when the monograph and addendum were written. These add significantly to knowledge of the family. For the facilities for making and the privilege of publishing these observations I am greatly indebted to the authorities of the Museo de La Plata and especially to Dr. Rosendo Pascual and Sr. Jorge Zetti. The accompanying photographs were made under the direction of Sr. Zetti and provided for this publication by the Museo. In Buenos Aires Sr. Guillermo del Corro courteously made available the type of Argyrolagiis palmeri. The drawing was made by RaVae Marsh from a sketch by me. While making this study I was employed jointly by Harvard University and the Uni-versity of Arizona. In the following all measurements are in miUimeters: L r=z length (anteroposterior or mesiodistal). W = width (bucco-lingual). Ljj = length of trigonid. Lp = length of talonid. W^ =r width of trigonid. Wj, = width of talonid. MACN = Museo Argentino de
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