472 ■ BULLETIN 17 6, UNITED STATES NATIONAL MUSEUM 



Field marks. — The most conspicuous and diagnostic field mark of 

 the broad-billed hummingbird is the broad, purplish-red or carmine 

 bill; the bill of the adult male is wholly red, except for the dusky 

 tip; that of the 3'oung male and the female is basally red. The 

 color pattern of the adult male is distinctive, green upper parts and 

 breast, bluish-green throat, white posterior under parts, and glossy 

 blue-black tail. The female, adult or young, has a grayish breast 

 and some green in the tail. The young male has a tail like his 

 father, and the young female one like her mother. 



DISTRIBUTION 



Range. — Southern Arizona, south to central Mexico. 



Breeding range. — The broad-billed hummingbird breeds north to 

 southeastern Arizona (Santa Catalina Mountains and Sabino Can- 

 yon) ; probably rarely southwestern New Mexico (Cloverdale Range) ; 

 and central Nuevo Leon (Monterey). East to western Xuevo Leon 

 (Monterey) ; and the State of Mexico (Chimalcoyoc). South to the 

 State of Mexico (Chimalcoyoc) ; Jalisco (Lake Chapala) ; and south- 

 ern Sinaloa (Escuinapa). West to Sinaloa (Escuinapa) ; Sonora 

 (Tesia, San Javier, Moctezuma, and Saric) ; and southeastern Ari- 

 zona (Santa Edta Mountains, probably Fresnal Canyon, and Santa 

 Catalina Mountains). 



'Winter range. — The species appears to be resident throughout the 

 Mexican portion of the range, although at this season it has been 

 recorded south to Taxco, State of Guerrero. It withdraws entirely 

 from the United States but winters north to central Sonora (Guay- 

 mas and Oposura). 



Migration. — ^Little information is available concerning the short 

 migratory flights that are made but early dates of arrival in Arizona 

 are: Rillito Creek, near Tucson, March 13, and Santa Catalina Moun- 

 tains, April 5. It leaves this region during the last of August and 

 early part of September. 



Egg dates. — Mexico : 16 records, Januaiy 16 to May 21 ; 8 records, 

 March 25 to May 11, indicating the height of the season. 



Arizona : 5 records, April 14 to July 15. 



