70 The Wilson Bulletin — No. 99 



ArchilocTius alexandri — Black-chinned Hummingbird. Humming- 

 birds were of common note, but as the majority were females or 

 immatures, visual identification was impossible. In point of rela- 

 tive abundance, however, alexandri probably ranked next to calypte 

 costae. All hummers fed readily from the various cactus flowers, 

 as well as those of the mesquite and palo verde, heavy pollen stains 

 marking every specimen secured. 



Calypte costae — Costa's Hummingbird. Common. Probably the 

 most plentiful of the Trochilidae. Mr. F'iggins had an interesting 

 experience with one of these birds while sketching under his um- 

 brella. The bird, a female, was fearlessly curious and repeatedly 

 came under the umbrella and perched on the ribs, or the canvas, 

 once flying so close to his face that he (Mr. F.) forgetting the 

 protection afforded by his glasses, shut his eyes for fear the bird 

 would strike at them. 



The males fight furiously, as is the case with all other Trochili- 

 dae that I have observed. One fight that I witnessed, kept up for 

 fully five minutes, when the vanquished bird fiew off, while the vic- 

 tor, too exhausted to pursue, perched nearby to preen his feathers. 

 Selasi)lwrits platycercus — Broad-tailed Hummingbird. Uncommon, 

 if not actually rare. Only one secured, a female, on the 20th. 



Tyrannus verticaUs — Arkansas Kingbird. Fairly common, with 

 vociferans and Myiarchus around the camp. Found only in the 

 vicinity of water. 



Tyrannus vociferans — Cassin's Kingbird. Rather more numer- 

 ous than verticaUs.. Usually found with them. 



Myiarchus m. magister — Arizona Crested Flycatcher. Plentiful. 

 The two forms of Myiarchus kept up, with the assistance of the 

 Kingbirds, a continual fight in the vicinity of our camp. Their 

 call-note may be likened to " Come 'er, Come 'er, Come 'er," uttered 

 rapidly with the accent on the " er." It is quite noticeable that 

 if another bird accepts the invitation, a fight is the inevitable re- 

 sult. A few of their nests were found in woodpecker excavations 

 in the sahuaros, usually with incubated eggs, and the ever-present 

 piece of shed snake-skin. This last is remarkable since we found 

 snakes decidedly rare. This form was always found along streams, 

 never in the open desert, as was cinerascens. 



Myiarchus c. cinerascens — Ash-throated Flycatcher. Found in 

 about the same numbers as migister, but more frequently in the 

 creosote covered foothills. 



Sayornis nigricans — Black Phoebe. Rather rare. Secured an adult 

 the first day in camp and two immatures subsequently. 



Nuttallornis borealis — Olive-sided Flycatcher. Not common. A 

 couple of specimens secured early in May, probably migrants to 

 the higher country. 



