THIRD ANNUAL MEETING ()9 



fin this connection it should be stated that these conclusions in 

 regard to life zones are provisional and svibject to correction, since they 

 are based upon observations made by the writer only during- the last 

 two weeks in May, 1900, and in June and July, 1901. During the season 

 of 1901 I was in the region in company with Mr. M. A. Carriker, Jr., 

 and my notes for this period are supplemented by his own.] 



Mammals. — Eestricted to the Upper Sonoran: Microtus modestus, Perog- 

 natlms flavescens(7), Perognathtis hispidus paradoxuf^, Perodipus richardsoni, 

 Omjcliomys leucogaster, Spermophilus spilosoma obsoletiis, Geomys luteseens, 

 Lepus melanotis, Cynomys ludovicianus, Vnlpes velox. 



Eestricted to the Transition: PeromyscMS texanus sxibarcticus, Neotoma 

 rupicola. Blarina sp., Cantor canadensis, Putorius lonf/icaudus, Erethizon 

 epixantMis, Odocoileus virginianus macrourus, Odocoilens hemionus, Myotis 

 evotis, Myotis californicus ciliolabrum. 



Common to the Upper Sonoran and Transition: Microtus ansterus 

 haydeni, Peromyscus texanus nebrascensis, Scalops aquaticus machrinus, Sperm- 

 ophilus 13-lineatus palUdus, Tamias minimus, Thoinomys sp.. Fiber zibethieus, 

 Lutreola vison (following up streams from Upper Sonoran into Transi- 

 tion), Procyon lotor, Lepus baileyi, Lynx rufus{'i), Canis nebrascensis. 

 Mephitis hndsonica, Taxidea taxus, Antilocapra americana, Vespertilo fuscus. 



PLA^ers. — Restricted to the Upper Sonoran: Populus deltoides, Eriogonum 

 annuum, Atriplex nuttallii, Eurotia lanata, Sarcobatus vermiculatus, Argemone 

 intermedia, Ribes floridum, Rosa arkansana, Rosa woodsii. Primus pumila, 

 Amorplia fruticosa, AmorpJia canescens, Astragalus muUlflorus, AragaUus 

 lambertii, Rhtis glabra, Cactus (two species), Opnntia polyacantha, Lepargyrea 

 argentea, Gutierrezia euthamice, Eymenopappus fllif alius, Artemisia fiUfolia, 

 Artemisia tridentata (narrow tongues of sage brush extend well up into 

 the Transition on such of the north slopes of Pine Eidge as are open), 

 Artemisia, cana. 



Restricted to the Transition: Pinus ponderosa, Juniperus communis, 

 Limnorchis hyperborea, Corallorhiza multiflora, Populus balsamifera, Populus 

 tremuloides, Ostrya tnrginiana, Berberis aquifolium, Sedum stenopetalum, 

 Ribes cereum, Amelanchier alnifolia. Astragalus hypoglottis, Acer glabrum, 

 Viola canadensis, Cornus amomum, Galium boreale, Symphoricarpus pauci- 

 florus, Campanula rotundifoUa. 



Common to the Upper Sonoran and Transition: Juniperus virginiana, 

 Salix nigra, Betula oecidentalis, Ulmus americana. Clematis ligusticifolia, 

 Ribes oxyacanthoides, Ribes aureum. Primus demissa, Lupinus plattensis, 

 Rhus trilobata, Rhus radicans, Acer negundo, Vitis cordifoUaf Parthenocissus 

 quinquefolia, Cornus stolonlfcra. Symphoricarpus oecidentalis, Townsendia 

 grandiflora. 



The above lists are composed mainly of shrubs and woody perennials, 

 as these are of much the greater value in determining zonal limitations. 

 Nomenclature according to Britton. 



