NATURAL AREAS AND REGIONS 



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Neotoma fuscipes macrotis, large-eared 



wood rat. 

 Cratogeomys fulvescens, plateau fulvous 



pocket gopher. 

 Liomys bulleri, BuUer's spiny pocket 



mouse. 

 Dipodomys phillipsii, Phillips' kangaroo 



rat. 

 Citellus variegatus variegatus, Mexican 



plateau rock squirrel. 

 Thomomys boltae nigricans, Stephens' 



pocket gopher. 

 Thomomys bottae alticolus, Sierra Laguna 



pocket gopher. 

 iSciu7-us aureogaster frumentor, Perote 



squirrel. 

 Lepus gailliardi gailliardi, Gailliard's 



jack rabbit. 

 Odocoileus hemionus canus, gray mule 



deer (also Lower Austral). 



Birds 



Chloroenas fasciaia vioscae, Viosca's 

 pigeon. 



Balanosphyra formicivora bairdi, Cali- 

 fornia woodpecker. 



Balanosphyra formicivora angustifrons, 

 narrow-fronted woodpecker. 



Dryobates villosus intermedins, inter- 

 mediate woodpecker. 



Basilinna xantusii, Xantus' humming- 

 bird. 



Tuchycineta thalassina brachyptera, 

 Lower California violet green swallow. 



Thryomanes bewickii charienturus, San 

 Diego wren. 



Tardus confinis, San Lucas robin. 



Chamaea fasciata henshawi, pallid wren- 

 tit. 



Baeolophus wollweberi wollweberi, WoU- 

 weber's titmouse. 



Baeolophus ivollweberi annexus, bridled 

 titmouse. 



Baeolophus inornatus cineracens, ashy 

 titmouse. 



Baeolophus inornaliis murinus, San 

 Diego titmouse. 



Psaltriparus minimus minimus, bush- 

 tit. 



Psaltriparus melanotis melanotis, black- 

 eared bush-tit. 



Psaltriparus grindae, Grinda's bush-tit. 



Sitta carolinensis lagunae, Lower Cali- 

 fornia nuthatch. 



Cyanocephalus cyanocephalus, pinyon 

 jay. 



Aphelocoma cyanotis, blue-cheeked jay. 



Aphelocoma sumichrasti, Sumichrast's 

 jay. 



Aphelocoma sieberii wollweberi, Zacatecas 

 jay. 



Vireo huttoni cognatus, Frazar's vireo. 



Megaquisculus tenuirostris, slender- 

 billed grackle. 



Aimophila ruficeps ruficeps, rufous- 

 crowned sparrow. 



Aimophila ruficeps sororia, Laguna 



sparrow. 

 Pipilo fuscus potosinus, plateau brown 



towhee. 

 Pipilo maculalus magnirostris, mountain 



towhee. 



d. Pine Association (Transition Zone) . 

 An area, commonly characterized by 

 the occurrence of yellow pine, and 

 associated species as plant indicators 

 occupies the upper slopes of the Sierra 

 Madre Occidental, except the summits 

 of the few high peaks, from near the 

 international boundary to the southern 

 part of the Republic where it is rep- 

 resented on the slopes of the higher 

 mountains, and thence northward along 

 the Sierra Madre Oriental largely in 

 the State of Vera Cruz. It also includes 

 most of the upper slopes of the San 

 Pedro Martir Mountains in northern 

 Lower California and of ranges which 

 rise island-like to a sufficient altitude 

 from the great interior plateau. 



Plants 



Pinus ponderosa, western yellow pine. 

 Pinus chihuahuana. Chihuahua pine. 

 Pinus lumholtzii, Lumholtz' pine. 

 Pinus arizonica, Arizona pine. 

 Pinus lambertiana, sugar pine. 

 Pinus coulteri, Coulter's pine. 

 Robinia neomexicana, New Mexican 



locust. 

 Rhamnus betulaefolia. 



Mammals 



Scapanus anthonyi, Anthony's mole. 

 Ursus nelsoni, Nelson's grizzly bear. 

 Ursus machetes. Chihuahua black bear. 

 Ursus americanus eremicus, Coahuila 



black bear. 

 Cants mexicanus, Mexican wolf. 

 Reithrodontomys megalotis zacatecae, 



Zacatecas harvest mouse. 

 Peromyscus truei martirensis, San Pedro 



Martir mouse. 

 Peromyscus difficilis difficilis, Zacatecas 



mouse. 

 Sigmodon leucotis, white-eared cotton 



rat. 

 Nelsonia neotomodon, Zacatecas little 



wood rat. 

 Neotoma albigula zacatecae, Zacatecas 



white-throated wood rat. 

 Neotoma mexicana madrensis, Sierra 



Madre wood rat. 

 Microtus mexicanus phaeus, Colima 



meadow mouse. 



