220 Univi rsity of California Publications in Zoology I Vol. 10 



Just as with life zones and faunal areas, we find many species. 

 of wide dispersal through two or more of even the major asso- 

 ciations. For such cases various modifying terms become neces- 

 sary. 



In thus attempting to bring some degree of order into the 

 distributional treatment of the species of a large area, we would 

 urge a reasonable limitation. For efforts of this sorl serve to 

 impress upon the student the fact that there is the reverse of 

 uniformity in the behavior of species. In fact if we should 

 carry our analytical processes far enough, we should doubtless 

 find that no 1\vo species anywhere exist under precisely the same 

 set of conditions: hence the dependent conclusion that no two 

 species occupy precisely the same area. 



CHECK-LIST OF THE BIRDS 



PAGE 



1. Colymbus nigricollis ealifornicus (Heermann) 224 



2. Podilymbus podiceps Linnaeus) 224 



3. Phalacrocorax auritus albociliatus Ridgway 224 



4. Anas platyrhynchos Linnaeus 224 



."5. Dafila acuta (Linnaeus) 224 



6. Querquedula cyanoptera (Vieillot) 224 



7. Marila affinis (Eyton) 22r> 



8. Erismatura jamaicensis (Gmelin) 225 



9. I> Irocygna bieolor (Vieillot) 225 



10. Plegadis guarauna (Linnaeus) 225 



11. Botaurus lentiginosus (Montagu) 225 



12. Ardea herodias hyperonea Oberholser .. 225 



13. Nycticorax nycticorax naevius (Boddaert) 22<i 



14. Butorides virescens anthonyi (Mearns) 22<'> 



15. Pulica americana Gmelin 226 



16. Steganopus tricolor Vieillot 226 



17. Recurvirostra americana Gmelin 226 



IS. Himantopus mexicanus (Muller) 227 



19. Gallinago delicata (Ord) 227 



20. Pisobia minutilla (Vieillot) 227 



21. Helodromas solitarius cinnamoineus (Brewster) 227 



22. Actitis maeularius (Linnaeus) 227 



23. Oxyechus vociferus (Linnaeus) 228 



24. Oreortyx picta plumifera (Gould) 228 



25. Lophortyx californica vallicola (Ridgway) 230 



2<l. Lophortyx gambeli Gambel 231 



27. Columba fasciata fasciata Say 233 



28. Zenaidura maeroura carolinensis (Linnaeus) 233 



