lxxiv 
INTRODUCTION 
BIRDS OF PINAL, PIMA, AND GILA COUNTIES, ARIZONA. 
From W. E. D. Scott, in The Auk, vol. iii. 383, 421, 1886; vol. iv. 16, 196, 
1887; vol. v. 29, 159, 1888. 
The region covered by Mr. Scott’s paper extends eighty miles 
north and forty miles south of Tucson. The Santa Catalina Moun¬ 
tains form its backbone, and the Gila, Santa Cruz, and San Pedro 
rivers flow through it. The region about Tucson is a plain of about 
2300 feet altitude, arid and cactus-grown except where it is watered 
by springs and sporadic streams which support cottonwoods and 
other trees. The Florence region in the valley of the Gila is similar 
to that about Tucson. At Riverside the valley is much narrower. 
Mineral Creek rises at about 5000 feet altitude in the Pinal Moun¬ 
tains. The birds of the entire region may be divided into birds of the 
plains and valleys, birds of the oak belt, and birds of the pine re¬ 
gions, though of course the species shift back and forth, the vertical 
migration being here as important as the north and south migra¬ 
tions. 
. Podilymbus podiceps: Pied-billed Grebe. — Two taken by Mr. Herbert 
Brown near Tucson in February. 
Gavia lumme : Red-throated Loon. — One taken in December near Tucson. 
Merganser americanus: Merganser. — Seen at San Pedro River in Jan¬ 
uary. 
Lophodytes cucullatus: Hooded Merganser. — One taken by Mr. Brown 
near Tucson in December. 
Anas boschas: Mallard. — One of the commonest ducks about Tucson in 
fall and winter. 
Chaulelasmus streperus: Gadwall. — One taken by Mr. Brown near Tuc¬ 
son. 
Mareca americana: Baldpate. — Found on San Pedro River in small flocks 
in January. 
Nettion carolinensis: Green-winged Teal. — Abundant about Tucson at 
times during the winter (Brown). 
Querquedula discors : Blue-winged Teal. — A few seen on San Pedro 
River; uncommon about Tucson (Brown). 
Querquedula cyanoptera : Cinnamon Teal. — Common winter visitant about 
Tucson (Brown). 
Spatula clypeata : Shoveller. — Common about Tucson in winter (Brown). 
Dafila acuta : Pintail. — Not uncommon on San Pedro River in March. 
Aythya americana: Redhead. — Common about Tucson in winter (Brown), 
and found in small flocks on San Pedro River in January. 
Aythya vallisneria: Canvas-back. — A small flock seen on San Pedro in 
January. 
Aythya marila : Scaup Duck. — Rather common on San Pedro River in 
winter. 
Aythya affinis: Lesser Scaup Duck. — A few seen on the San Pedro in 
January. 
