NATURAL AREAS AND REGIONS 



587 



Plants 



Pinus contorta, lodgepole pine. 

 Pseudotsuga mucronata, Douglas fir 



(also Transition). 

 Abies religiosa, pinabete. 

 Populus treviuloides (also Transition). 

 Alnus firmifolia, alder. 

 Quercus ghiesbrechtii, Ghiesbrecht's oak. 



Mammals 



Sorex orizabae, Mount Orizaba shrew* 

 Cryptotis alticola, Mount Popocatepetl 



shrew. 

 Bassariscus astutus astutus, Mexican 



plateau bassariscus. 

 Reithrodontomys chrysopsis chrysopsis, 



volcano harvest mouse. 

 Peromyscus oaxacensis, Oaxaca mouse. 

 Peromyscus difficils felipensis, Cerro 



San Felipe mouse. 

 Sigmodon alticola alticola, Oaxaca cotton 



rat. 

 Neotomodon orizabae, Orizaba little 



wood rat. 

 Microtus mexicanus mexicanus, Mexican 



meadow mouse. 

 Cratogeomys oreocetes. Mount Popoca- 

 tepetl pocket gopher. 

 Romerolagus diazi, volcano rabbit. 



Birds 



Basilinna leucotis, white-eared hum- 

 mingbird (also Transition). 



Lampornis pringlei, Pringle's humming- 

 bird. 



Eugenes fulgens, Rivoli hummingbird 

 (also Transition). 



Selasphorus platycercus, broad-tailed 

 hummingbird (also Transition). 



Troglodytes brunneicollis brunneicolHs, 

 brown-throated wren (also Transition). 



Sialia mexicana australis. Nelson's blue- 

 bird. 



Certhia familiaris albescens, Sierra 

 Madre creeper. 



Nucifraga Columbiana, Clarke's nut- 

 cracker. 



Cyanocitta stelleri azteca, Aztec jay 

 (also Transition). 



Ergaticus ruber, red warbler (also 

 Transition). 



Ergaticus versicolor, pink-headed warbler 

 (also Transition). 



Loxia curvirostra stricklandi, Mexican 

 crossbill. 



Spinus pinus macropterus, Mexican 

 pme siskin (also Transition). 



Spinus atriceps, Guatemalan pine siskin. 



Carpodacus cassinii, Cassin's purple 

 finch. 



Junco phaeonotus phaeonotus, Mexican 

 junco (also Transition). 



2. Minor life areas 



A few of the numerous regional life 

 areas, into which the major life zones of 

 Mexico are divisible, may briefly be 

 indicated.^ No attempt is made to 

 list the total number of species that 

 occur. 



a. Cape Louiands District {Arid Trop- 

 ical Zone). Lowlands of Cape region 

 of Lower California. Desert plains 

 and low mountains. Flora and fauna 

 derived largely from adjacent mainland 

 of Mexico. 



Plants 



Haematoxylum brasiletto, logwood, palo 



de Brasil. 

 Esenbeckia flava, palo amarillo. 

 Elaphrium rhoifolium. 

 Sapium biloculare, hierba de la flecha. 

 Cyrtocarpa edulis, ciruela. 

 Maytenus phyllanthoides, mangle dulce. 

 Dodonaea viscosa, switch sorrel. 

 Rhizophora mangle, mangrove. 

 Conocarpus erecta. 



Mammals 



Oryzomys peninsulae. Lower California 



rice rat. 

 Balantiopteryx plicata, Peter's pouched 



bat. 

 Natalus mexicanus, Santa Anita bat. 

 Dasypterus ega xanthinus, Sierra Laguna 



bat. 

 Pizonyx vivesi, Cardonal Island bat. 



Birds 



Ardea herodias sancti-lucae, San Lucas 

 great blue heron. 



Egretta thula brcrsteri, Brewster's egret. 



Rallus beldingi, Belding's rail. 



Crotophaga sulcirostris, groove-billed 

 ani. 



Toxostoma cinereum cinereum, San Lucas 

 thrasher. 



Dendroica bryanti castaneiceps, man- 

 grove warbler. 



Richmondena cardinalis ignea, San Lucas 

 cardinal. 



Pyrrhuloxia sinuata peninsulae, San 

 Lucas pyrrhuloxia. 



Cyanospiza versicolor, varied bunting. 



b. Vizcaino Desert District {Lower 

 Austral Zone). Central Lower Cali- 

 fornia. Desert plains and low, but 

 rugged mountains. A region of extreme 



' For full treatment of floral and faunal districts in 

 Lower California, see Nelson, 1921, pages 117-132. 



