Tnins. Am. V.ui . Soc, \nl. XI. IV 



\'\. \\[. 



Fig. 1. Slopes at Calionte, Liiu-olii Coimty, Nevada. Walls of lateral 

 canyon of Meadow Valley. Hal)itat of M(irs<(i ralifoniicd (Initiicola. (I'lioto- 

 ftrajih l)y Rehn anfi Hel)ar(l.) 



Fig. '2. iMiviroiitiK'iit at ("ri'stliiie, l.iiirnln ('oiinly, Xex'ada. N'ctictatidii 

 chiefly sage and Utah .luiiiper [J iinipcni.s utdhciinis). llal)itat of .M>iis(<i 

 ailifondca dninicola at upper limits of its distrihution. (Photograi)h i)y Keliii 



ami HclKird.! 



Kl ll\ WD III I', \KD -NOR 111 A.\U-K1C.\N IX .\l.\s I ACIN.XL 



