Brew^ster on a Collection of Arizo?ia Birds. 67 



with such privations, and often positive sutFering, that little atten- 

 tion could be paid to birds, Mr. Stephens arrived at Yuma on 

 July 15, and by August i reached his final destination, Riverside, 

 California. 



The entire trip yielded about six hundred and fifty skins besides 

 a fairly large number of nests and eggs. Under the terms of our 

 agreement I had all the birds, a representative series of the nests 

 and eggs, and the field-notes relating to both. This collection, 

 embracing the results of four months' uninterrupted work in a re- 

 gion as yet only imperfectly known, seems to me too complete in 

 itself to be merely skimmed of its cream. Accordingly in prepar- 

 ing the following paper I have included everv species which is 

 represented among the specimens or mentioned in the collector's 

 notes. It should be understood, however, that the latter were 

 not kept with reference to this plan, and it is not unlikely that 

 certain common birds, which are known to occur in Arizona, 

 were inadvertently omitted. For similar reasons, the number of 

 specimens obtained can seldom be taken as an exponent of the 

 relative abundance of the species to which they belong, as a de- 

 cided preference was given to the rarer kinds. Three species new 

 to the ''North American" fauna have ali"eadv been announced 

 (this Bulletin, Vol. VI, p. 252.). 



A few technical points require explanation. The catalogue 

 numbers are usually those of the collector's field-book, but in 

 certain cases — as of specimens taken as types, or with birds ob- 

 tained by Mr. Stephens before starting on the present trip — I have 

 used my own numbers, either alone (^r in connection with the 

 original ones. This double system need cause no confusion, how- 

 ever, for the field-numbers never reach 700, while those of my 

 general catalogue are always above 5,000. Of the measurements, 

 the length and stretch were taken in the field, the others from the 

 dry skins. The biographical matter is of course based on 

 Mr. Stephens' notes, which are sometimes paraphrased, some- 

 times literally quoted, as convenience dictates. The frequent 

 quotations of Mr. Henshaw's experience or opinions are always, 

 unless otherwise stated, from his Report in Volume V of "Explo- 

 rations and Survevs West of the One Hundredth Meridian." 



I. Turdus unalascae Gmel. Dwarf Thrush. — The only 

 Hermit Thrush in tlic present collection is unmistakably refera- 



