118 PROCEEDINGS OF THE ACADEMY OF [1892. 



rising with a diminishing cadence of voice and wings to the tree- 

 tops on the opposite side where it repeats the manoeuvre, regaining 

 its former position. These evolutions are kept up in rapid succession, 

 sometimes as many as thirty flights being taken with scarcely a rest. 

 The geometric exactness of the curves which are traced by the bird 

 is astonishing. 



The nests of the Black-chinned Hummer are easily found, but my 

 experience agrees with that of Mr. Scott regarding the scarcity of 

 nests of the other hummingbirds wdiich inhabit the Catalina 

 Mountains. 



39. Trochilus platycercus Swains. Broad-tailed Humming-bird. 



A common l)ird, associating with the former. I found a pair 

 building in an oak tree beside a dry water-course but did not 

 discover the nest until I had killed the female, whose body con- 

 tained a well-developed egg. 



40. Tyrannus verticalis Say. Arkansas Kingbird. 



Found breeding from the plains to within a few hundred feet of 

 the pines. 



41. Tyrannus vociferans Swains. Cassin's Kingbird. 



A few seen and two captured in the oaks near Oracle. 



42. Myiarchus mexicanus magister Ridgw. Arizona Crested Flycatcher. 



This bird Avas not common. It was not seen at an elevation 

 of a thousand feet above Tucson. 



43. Myiarchus cinerascens Lawr. Ash-throated Flycatcher. 



Found well distributed and plentiful all the way from Tucson to 

 t'le lower regions of the pine belt. 

 41. Sayornis saya (Bonap.). Say's Pliojbe. 



As uniforndy distributed as the former thougli more common in 

 the oak woods. 



45. Sayornis nigricans (Swains.) Black I'hcwbe. 

 Seen only at Tucson and not common. 



46. Contopus pertinax Cab. Coues' Flycatcher. 



Only noticed in the pine belt where they were the most abundant 

 Flycatcher. 



47. Contopus richardsonii (Swain=.). Western Wood Pewee. 

 Seen only in the })ine but not common. 



