Brewster on a Collection of Arizona Birds. . 67 
with such privations, and often positive suffering, that little atten- 
tion could be paid to birds. Mr. Stephens arrived at Yuma on 
July 15, and by August 1 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 every 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 44 North American” fauna have already 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 or in connection with the 
original ones. This double system need cause no confusion, how- 
ever, for the field-numbers never reach 7 00 ? 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 Surveys West of the One Hundredth Meridian.” 
1. Turdus unalascae Gmel. Dwarf Thrush. — The only 
^Hermit Thrush in the present collection is unmistakably refera- 
