ARIZONA BLUE-THROATED HUMMINGBIRD 325 



compared with the uniformly dark, greenish-bronze tail of the male 

 Kivoli. The females of the two species are more alike but can be 

 recognized by the tails; the female Rivoli has the three outer 

 feathers tipped with grayish, whereas in the blue-throated these tips 

 are white. 



DISTRIBUTION 



Range. — Southern New Mexico and Arizona; south to Nicaragua. 



Breeding range. — Eivoli's hummingbird breeds north to southeast- 

 ern Arizona (Santa Catalina Mountains and Fort Huachuca) ; south- 

 western New Mexico (Chiricahua Mountains and San Luis Moun- 

 tains) ; and Nuevo Leon (Bravo). East to Nuevo Leon (Bravo); 

 western Tamaulipas (Rampahuilla) ; and Guatemala (Momostenango 

 and Tecpam). South to Guatemala (Tecpam, San I^ucas, and prob- 

 ably Santa Marta) ; and Guerrero (Omilteme). West to Guerrero 

 (Omilteme) ; State of Mexico (Volcano of Toluca) ; Durango (Ar- 

 royo del Buey) ; western Chihuahua (Pinos Altos) ; eastern Sonora 

 (Oposura) ; and southeastern Arizona (Huachuca Mountains, Santa 

 Rita Mountains, and Santa Catalina Mountains). 



'Winter range. — Present information does not permit exact deline- 

 ation of the winter range, but at this season it apparently is not found 

 north of Guerrero (Taxco). From this point it occurs southward 

 casually to Nicaragua (San Rafael). 



Migration. — Early dates of spring arrival in Arizona are: Hua- 

 chuca Mountains, April 24; Tombstone, May 9. No data are avail- 

 able for the fall migration. 



Egg dates. — Arizona: 24 records. May 6 to July 28; 12 records, 

 June 14 to July 14, indicating the height of the season. 



LAMPORNIS CLEMENCIAE BESSOPHILUS (Oberholsei) 



ARIZONA BLUE-THROATED HUMMINGBIRD 



Plates 51-52 



HABITS 



Although the blue-throated hummingbird had been known for 

 more than half a century, as a Mexican bird, it was not until 1884 that 

 it was introduced to our fauna. William Brewster received the first 

 specimen, which was taken by Frank Stephens's assistant in the Santa 

 Catalina Mountains, Ariz., on May 14, 1884. Since then it has been 

 found in the Huachuca, Chiricahua, and Santa Rita Mountains in 

 Arizona and in the San Luis Mountains in New Mexico ; it probably 

 will be found to occur in summer in some of the other mountain 

 ranges in that general region. This race of the species also is found 

 in the Sierra Madre of western Mexico. 



