1892.] NATURAL SCIENCES OF PHILADELPHIIA. 119 



48. Empidonax difficilis Baird. Western Flycatcher. 



Two nests with young and several mated jiairs were observed 

 in the Catalina pines. 



49. Empidonax pusillus (Swains.). Little Flycatcher. 



A pair were taken in a willow clump on the banks of the Santa 

 Clara. They evidently had a nest but it was not found. 



50. Pyrocephalus rubineus mexicanus (Scl,). Vermilion Flycatcher. 



The greatest altitude at which I secured this Flycatcher was that 

 of Oracle, nearly 6000 feet They were increasingly abundant as 

 you neared the jjlains. 



51. Otocoris alpestris adusta Dwight. Scorched Horned Lark. 



Horned Larks were not abundant, though I frequently observed 

 small companies on the higher plains and mesas between Tucson 

 and the oak belt. I succeeded in securing but one, a young bird, 

 fully fledged. 



52. Cyanocitta stelleri macrolopha (Baird). Long-cresttd Jay. 



This species was confined strictly to the pine belt during my stay. 

 Its scolding is a peculiar combination of hiss, snarl and sneer. 



53. Aphelocoma woodhousei (Baird). Woodhouse's Jay. 



Only three of these wary birds were noted, all within a mile of 

 Oracle, in the oak belt. 



54. Aphelocoma sieberi arizonae Ridgw. Arizona Jay. 



The strict coincidence of the range of this abundant species with 

 the limits of the oak belt is as remarkable as that of the Long- 

 crested Jay with the pines. 



55. Corvus corax sinuatus (Wagl.). American Raven, 



Several Ravens visited the water tank and corral at Oracle daily, 

 and I occa.sionally saw them soaring among the foothills. 



56. Corvus cryptoleucus Couch. White-necked Raven. 



The above remarks equally apply to this species, with the differ- 

 ence that the former generally betook themselves to higher altitudes 

 while the latter departed down the nearest canon toward the San 

 Pedro. 



57. Molothrus ater obscurus (Gmel.). Dwarf Cowbird. 

 Numerous in the valley and occasional around Oracle. 



