DESCRIPTION OF CAMPS. 



331 



44. Biitoriiles viresceos Ahundant. 



45. Nyctiardea uajvia Common. 



4G. Gallinula galeata Abundant. 



47. Fiilica americana Ahundant. 



48. Auas boschas Abundant. 



49. Chaulelasinus streperus Abundant. 



50. Querquedula cyanoptera Ahundant. 



51. Aytbya sp.l Ahundant. 



52. Larus sp. ? Abundant. 



53. Sterna forsteri ? Ahundant. 



54. Hydrochelidon lariforiuis Abundant. 



Having alluded to the close similarity between the bird-fauna of tlie 

 vicinity of Sacramento City and that of a locahty of corresponding latitude 

 in the Mississippi Valley, we select from the above list the species not 

 belonging to the latter locality, they being as follows : — 



1. Vireo pusillus. 



2. Carpodacus frontalis. 



3. Spizella breweri. 



4. Cyanospiza amoeua. 



5. Hedymeles melanocephalus. 



6. Pipilo oregonus. 



7. Agebeus tricolor. 



8. Icterus bullocki. 



9. Tyrannus verticalis. 



10. Sayornis nigricans. 



11. Oontopus richardsoni. 



12. Calypte annjB. 



13. Trochilus alexandri. 



14. Colaptes mexicauus. 



15. Speotyto hypogaja. 



16. Querquedula cyanoptera. 



Twelve of the above species are repesented east of the Rocky Mount- 

 ains by species so similar in appearance or habits that, to the common 

 observer, they might readily pass for the same birds. These represent- 

 ative species are the following : — 



Western representatives. Eastern representatives. 



Vireo pusillus, representing Vireo belli. 



Spizella breweri, representing Spizella pallida. 



Hedymeles melanocepbalus, representing Iledymeles ludovicianus. 



Cyanospiza amcena, representing Cyanospiza cyanea. 



Pipilo oregonus, representing Pipilo erythropbthalmus. 



Icterus bullocki, representing Icterus baltimore. 



Tyrannus verticalis, representing Tyrannus carolinensis. 



Sayornis nigricans, representing Sayornis fuscus. 



Contopus ricbardsoni, representing Contopus virens. 



Trocbibis alexandri, representing Trocbilus colubris. 



Colaptes mexicauus, representing Colaptes auratus. 



Querquedula cyanoptera, representing Querquedula discors. 



