16 PACIFIC COAST AVIFAUNA No. 10 



43- Ixobrychus exilis (Gmeiin). 



LEAST BITTERN. 



Synonym Ardetta exilis. 



Status Cones (i866a, p. 263) noted this species along the Colorado River 

 between Forts Yuma and Mohave, in September, 1865. This is the only record 

 for the state. 



44- Ardea herodias treganzai Court. 



PALLID GREAT BLUE HERON. 



Synonym Ardea herodias. 



Status Breeds along the Colorado River, and in southern Arizona, along 

 the Gila River and its tributaries (Mineral Creek, San Pedro River, etc.). Found 

 also in winter in the same region. There appear to be no records whatever from 

 the plateau region of northern Arizona. 



45. Herodias egretta (Gmeiin). 



AMERICAN EGRET. 



Synonyms Ardea egretta; Herodias alba egretta. 



Status Probably a migrant only; there are records of its occurrence in 

 April, May, and September, at various points on the Colorado, Gila, and San Pe- 

 dro rivers. 



46. Egretta candidissima candidissima (Gmeiin). 



SNOWY HERON. 



Synonyms Garzctta candidissima; Ardea candidissima. 



Status There are but two instances of the occurrence of this species in Ari- 

 zona: Coues (i866a, p. 263) observed it on the Colorado River between Forts 

 Mohave and Yuma in September, and Scott (1886, p. 385) reports a flock of five 

 seen, one of which was secured, near Tucson, in May. 



47. Butorides virescens anthonyi (Mearns). 



ANTHONY GREEN HERON. 



Synonyms Butorides virescens ; Ardea virescens; Ardea virescens anthonyi. 



Status The breeding range of this species appears to be about the same as 

 that of the Great Blue Heron along the Colorado River, the Gila River, and the 

 tributaries of the latter, north to the Big Sandy and Fort Verde (Oberholser. 

 1912, p. 543) ; while it is reported in winter from the lower Colorado near Yuma, 

 November or December, 1898 (Price, 1899, p. 91). Thus far it has not been 

 found in the northern plateau region. 



48. Nycticorax nycticorax naevius (Boddaert). 



BLACK-CROWNED NIGHT HERON. 



Synonyms Nyctiardea gardeni; Nyctiardea grisea naevia. 



Status A common migrant, occurring in suitable localities throughout the 

 region. Remains through the winter along the lower Colorado River, and prob- 

 ably in the warmer valleys of southern Arizona in general. Said to be a perma- 

 nent resident in the Verde Valley (Mearns, i8ox>a, p. 51). 



