114 University of California Publications in Zoology [Vol. 12 



Sterna forsteri Nuttall 

 Forster Tern 



Adult male (no. 12616), secured May 4 at the mouth of the Gila 

 River, Arizona, near Yuma; clearly a transient. 



Phalacrocorax auritus albociliatus Ridgway 



Farallon Cormorant 



Cormorants were not noted until the vicinity of Laguna Dam was 

 reached, and then only in small numbers. April 24 one was seen 

 at an overflow pond on the California side above Potholes; and on the 

 same date a small flock was observed in the distance flying up the 

 river, close over the water. Four individuals were seen below Pot- 

 holes, April 29. 



A lone individual (no. 12617) was shot on the river, nearest the 

 California shore, five miles northeast of Yuma, May 2. In this speci- 

 men the anterior lower parts forward to the chin are light drab 

 with numerous black feathers scattered uniformly through ; naked por- 

 tion of gular pouch bright orange yellow; wing 322mm., tail 164, 

 tarsus 65, middle toe with claw 100, culmen 56, depth of bill at base 

 17.7. Although immature, this bird is unequivocally referable to 

 P. a. albociliatus. 



Pelecanus erythrorhynchos Gmelin 

 White Pelican 



Although reported to be extremely numerous at times along the 

 river, we saw only stragglers. One was seen March 22 on a mud 

 bar in the river above Blythe ; April 3 one was noted opposite Cibola 

 flying down the river. 



Mergus serrator Linnaeus 

 Red-breasted Merganser 



February 18 two small flocks were seen a few miles below Needles; 

 March 8 three individuals flew past our boat as we entered Cheme- 

 huevis Valley. 



