330 BULLETIN 17 6, UNITED STATES NATIONAL. MUSEUM 



broad tail, with the prominent white tips of the three outer rectrices, 

 recognizable in both sexes and at all ages; only the female Rivoli's 

 has light tipped outer rectrices, and these are gray rather than white. 

 The blue throat of the male is not conspicuous, except at short range 

 and in good light, but the white postocular and rictal stripes are 

 more easily seen at short distances, especially the former. 



DISTRIBUTION 



Range. — Southern Arizona, New Mexico, and Texas south to 

 southern Mexico. 



Breeding range. — The blue-throated hummingbird breeds north to 

 southeastern Arizona (Santa Catalina Mountains, Paradise, and the 

 Chiricahua Mountains) ; southwestern New Mexico (San Luis Moun- 

 tains) ; southwestern Texas (Chisos Mountains) ; and Nuevo Leon 

 (Bravo). East to Nuevo Leon (Bravo and Galindo) ; and Veracruz 

 (Las Minas, Las Vigas, and Huamantla). South to southern Vera- 

 cruz (Huamantla) ; State of Mexico (Mexico and the Volcano of 

 Toluca) ; and Guerrero (Omilteme). West to central Guerrero (Omil- 

 teme) ; Durango (Arroyo del Buey) ; western Chihuahua (Jesus 

 Maria and Pinos Altos) ; eastern Sonora (Oposura) ; and southeastern 

 Arizona (Ramsay Canyon, Tombstone, and Santa Catalina Moun- 

 tains). 



'Winter range. — During the winter season the species is apparently 

 concentrated in southern Mexico, chiefly in the States of Michoacan 

 (Nahuatzen and Mount Tancitaro) ; and Guerrero (Taxco and 

 Chilpancingo) . 



The range as outlined is for the entire species, which has been sep- 

 arated into two subspecies. The Texas blue-throated hummingbird 

 (Z. c. Glemenx)iae) ranges from southern Mexico north to western 

 Texas, while the Arizona blue-throated hummingbird {L. c. hes- 

 sophilus) is found through the Sierra Madre of western Mexico 

 north to Arizona and New Mexico. 



Migration. — ^Very little is known about the migrations of these 

 birds, but they have been observed to arrive in the spring at Tucson, 

 Ariz., as early as April 21. 



Egg dates. — Arizona : 7 records. May 14 to July 17. 



Mexico : 2 records, February 17 and September 9. 



LAMPORNIS CLEMENCIAE CLEMENCIAE (Lesson) 

 TEXAS BLUE-THROATED HUMMINGBIRD 



HABITS 



Since Dr. Oberholser (1918) has described the Arizona bird as 

 subspecifically distinct from the Mexican bird of the earlier authors, 

 this type race of the species has been restricted in its distribution 



