ORNITHOLOGY OF GUADALUPE ISLAND. 273 



There yet remain unsown the eggs of Pipilo consobnnus, 

 T/iryothorus brevicaudus and Polyborus lutosus, and also the 

 young plumage of Thryothorus brevicaudus, Colaptes rufi- 

 pileus and Regulus obscurus. 



From Dr. Palmer's notes I was led to suppose that the 

 breeding season on Guadalupe differed but slightly, if any, 

 from that about the vicinity of San Francisco Bay. Per- 

 sonal observation, however, reveals the fact that on the 

 island it is several months earlier, nesting beginning with 

 many of the species in the winter, as will be seen by the 

 dates accompanying the notes. 



The researches made by Mr. L. Belding on the western 

 coast of Lower California, disclose the fact that, as far 

 south as Cerros Island (about 28 deg. north), the birds do 

 not differ from those found near San Diego. 



With the exception of a pair of falcons (F. mexicanus ?), 

 which were not taken, the subjoined is a complete list of 

 the birds which I found inhabiting Guadalupe Island. 

 Nevertheless, there is a strong probability that others have 

 and will find rest in transit, or permanently, as in the case of 

 the cross-bills and nuthatches. Without going into the 

 details of a strict technical treatise, I will endeavor to 

 give a full account of the habits, distribution and num- 

 bers of the birds from my personal observation. The 

 measurements have been carefully taken and com- 

 pared with specimens and published descriptions, those of 

 the more common species being omitted. 



The Mexican names of many birds were not known to the 

 inhabitants, and in some instances it was evident that they 

 either confounded the species or applied to a bird the name 

 of some similar bird with which they were familiar. As they 

 may, however, be of use to others who may visit the island, 

 I append the names as they were given me : 



1. Buteo borealis calurus. " Aguilia," which more strictly 

 means an eagle. 



