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University of California Publications in Zoology [Vol. 12 



sandj' creosote, and the stony, or rocky, creosote ; but by giving weight 

 to sitnilarities, as well as to differences, such distinction conld be of 

 but minor rank. Expediency seems to argue against further refine- 

 ment in the present stage of study. Then, too, no such precise statis- 

 tical gathering of data as regards the animals has yet been done as 

 would warrant the exercise of such fine analysis. 



Catclaw (or wash) Assoclvtion 



Lopliortyx gamlu'li: iiiin.; resident 



Zen.iiilur;i niacroura marginella: niin.; 

 winter 



Bubo virginianus palloseens: max.; 

 resident 



Geococcyx calif orniamis: max.; resi- 

 dent 



Dryobates scalaris cactopliilvis: niiii.; 

 resident 



I'halaenoptilus nuttalli mitt.-illi: niin.: 

 winter 



Phalaenoptiliis nuttalli uitidus: niin.; 

 resident 



Archilocbus alexandri: min. ; summer 



Calypte eostae: min.; summer 



Myiarehus cinerascens cineraseens: 

 min.; summer 



Icterus eucullatus nelsoni: min.; tran- 

 sient 



Icterus bulliiclci: min.; transient 



Carpodacus moxicanus frontalis: 

 max.; resident 



Astragalinus psaltria hesperophilus: 

 max.; resident 



Zonotrieliia leucoplirvs leueopbrys: 



max.; transient 

 Zonotrieliia leucoplirys gambeli: min.; 



winter 

 Zamelodia melanoeepliala melanoce- 



pliala: min.; transient 

 I'hainopepla nitens: min.; resident 

 Lanins ludovieianus excubitorides: 



max.; resident (?) 

 Lanivireo solitarius cassini: min.; 



transient 

 Oreoscoptes montanus: min.; winter 

 Mimus polyglottos leucopterus: min.; 



winter 

 Heleodytes brunnoieapillus coiiesi: 



max.; resident 

 Thryomanes bewicki eremophilus: 



max.; winter 

 Auriparus flavieeps flaviceps: max.; 



resident 

 Polioptila eaoiulea obseura: max.; 



winter 

 Polioptila plumbea: max.; resident 



MAMMALS 



Odoeoileus lieniionus oremieus: max. 

 Peroniyseus eremicus eremicus: min. 

 Dipodomys merriarai merriami: min. 

 Perognathus formosus: min. 

 Perognatlius penicillatus penicillatus: 

 max. 



Perognatlius spinatus spinatus: min. 

 Lepus calif ornicus deserticola: min. 

 Lynx eremicus eremicus: min. 

 Urocyon einereoargenteus scotti: min. 

 Pipistrellus hesperus hesperus: min. 



Eemarks upon the Catclaw {or Wash) Association. — Except for 

 the Bill Williams and Gila rivers the Needles-to-Yuma section of the 

 Colorado Kiver receives no tnluitary stream, save as an immediate 



