LBPOUIDili-GEOOUArUICAL VAUlATKiN. 



271 



from AliiMka nnd tlio noithwestorn portions of Uritisli Aincricn. 'I'liis 

 iiistuncc, liowovcr, forms tlic only nctuiil oxccplion to the general law of 

 decrease in size southward. In nil the other species, those from the more 

 sontiiern localities are the smaller. Thus, Georgia specimens of Lrpus 

 sylouticus are appreciuhly smaller than th().><c from about Wa.shiiigton ; sjM'ci- 

 mcns of variety NuttalU from West(!rn Texas arc smaller than those of the 

 same variety from I)e(M' Creek, Nehraska ; sjiecimens of L. culifornkus from 

 Capo Saint Lucas are also considerably smaller than tiiost; from about San 

 Francisco; nnd the same is true of specimens of L. Trotibridgri from these 

 two localities. 



a 



Tadi.ie l.—iletx»artmmli of tkulh of Amtrkan tpeeUt and lai iciln of Lepi'S, fAoi ing variation in titt, wH\ 



localily. 



While in the Lepus sijlvaticus group, variety xylmlicus shades imper- 

 ceptibly into variety Nuttalli in passing from the wooded region westward 

 to the treeless plains, nnd while Iowa specimens of sylvalicus arc the largest 



1.- -i 



