XX 
Fic. 
LV 
OE Vile 
De Valle 
EW AU, 
MIDIS 
WW}. 
ee 
IGGL, 
IE JUL. 
LIV. 
EWe 
LVL 
ILW/ALIE. 
ILA 
LIST OF FIGURES IN THE TEXT. 
PAGE 
Microtus.eshypety bartse 3h dois: k-th aie sateen chaise eee 302 
Cratogeomys castanops es 5.2 annoy tay ere ee 315 
Thomioniys kil Vast. oe ae. ene ee eect 334 
Dipodomiys sierriagai 7.7.2 chsh esmees aoe pa ele nee 346 
Péroonathus meriand! oh). tyne eee ee Gk ee hee 354 
Meteronysiallent:2\5 2) ) 2). oa She qe eke ene nego 5) oe ee 376 
Toncheres.lalbilis <3 see shee: ae cliche ewe esse eee 384 
Capromiys: pilorides: 2. sai oat 2 waite crags esheets ee 390 
Plasiodontia aédiuny. 20-6 occ oe Sea eee ee 396 
Erethizoniepixanthum >. 2004402 3) a aaa ee 399 
Coendil mexicanum... 2.475 2: ae nano ae oe ee ee eee 401 
Dasyproctaasthmiuca : 2. 5022!)...5 555e ee ae er 406 
Agoutl PAC, VIF SALA. Ge as ol Setsae. ols ne Se ce 409 
Bepus allem: (02) is tise aot set wie an ore ote ee 434 
