PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON 11 3(1):302-31 8. 2000. Revision of the extant taxa of the genus Notiosorex (Mammalia: Insectivora: Soricidae) Leslie N. Carraway and Robert M. Timm (LNC) Nash 104, Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon 97331-3803, U.S.A.; (RMT) Natural History Museum & Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, Kansas 66045-2454, U.S.A. Abstract. — We evaluated the taxonomic status of three specimens of gray shrews, Notiosorex (Insectivora: Soricidae), collected in isolated mountain val-leys in Tamaulipas, Mexico, with specimens referable to the Recent taxa N crawfordi crawfordi (n = 229) and N. c. evotis {n = 34). Statistical analyses of cranial morphometric data revealed that the specimens from Tamaulipas represented a heretofore unknown taxon which is described herein as a new species of Notiosorex (N. villai). Also, N. c. evotis was found to be equally distinct from N. c. crawfordi, thus was elevated to specific status. Resumen. — Se evaluo el estado taxonomico de tres especimenes de la mu-sarana gris Notiosorex (Insectivora: Soricidae), colectados en valles dentro de las motafias en Tamaulipas, Mexico y referidos a los taxa recientes N. crawfordi crawfordi (n — 229) y N. c. evotis (n = 34). Analisis estadisticos morfometricos del craneo indicaron que los especimenes de Tamaulipas representan un taxon desconocido, el cual se describe como una especie nueva de Notiosorex (N. villai). Asimismo, N. c. evotis se encontro distinto a N. c. crawfordi, por lo que se elevo al nivel especifico. Gray shrews of the genus Notiosorex (In-sectivora: Soricidae) are widely distributed in the southwestern United States and northern and western Mexico (Fig. 1). They range from southern California, Nevada, Utah, Colorado, Oklahoma, and western Arkansas, southward to southern Baja Cal-ifornia Sur, Michoacan, and southern Ta-maulipas (Sealander 1952, Baker 1966, Armstrong & Jones 1972, Woloszyn & Wo-loszyn 1982, Carie et al. 1989). Insular re-cords are known from Isla San Martin, Baja California Norte (Schulz et al. 1970), and Isla Palmito del Verde, Sinaloa, Mexico (Armstrong & Jones 1971). Gray shrews occur in a variety of habitats including de-sert shrub (characterized by mesquites, Pro-sopis; palo verde, Cercidium; Acacia; Yuc-ca; Agave; and scattered Juniperus; Lange 1959), pine-oak forest (characterized by Abies religiosa, Populus tremuloides, Jun-iperus flaccida, four species of Pinus, and three of Quercus; Alvarez 1963), in grass-land with oak chaparral (characterized by chamise, Adenostomna fasciculatum; scrub oak, Quercus dumosa; California live oak, Q. agrifolia; and mountain lilac, Ceano-thus) and oak woodland habitats nearby (Cunningham 1956), coastal sage scrub (characterized by coastal sagebrush, Arte-mesia californica; black sage, Salvia mel-lifera; laurel sumac, Rhus laurina; and grasses), yellow pine forest {Pinus austral-is; Lange 1959), alkaline marsh (Stephens 1906), arid grasslands (containing scattered catclaw, juniper, and mesquite; Baker 1966), and sandy flats (characterized by Ar-temisia tridentata, Ephedra viridis, Peuce-phyllum schottii, and Chrysothamnus vis-cidiflorus; Fisher 1941). Elevations of oc-cupied habitats range from 3 to 2618 m (Fisher 1941, Lange 1959, Baker 1966, Da-
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