542 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.42. 



BUTORIDES VIRESCENS FRAZARI (Brewster). 



Ardea virescens frazari Brewster, Auk, vol. 5, January, 1888, p. 83 (La Paz, 

 Lower California). 



Chars, suhsp. — Resembling Butorides virescens virescens, but hind 

 neck, sides of neck, and foreneck, darker, more purplish, less maroon; 

 breast and posterior lower parts darker; edgings of superior wing- 

 coverts darker; upper surface of body averaging duller and more 

 deeply colored; average size yery slightly greater. 



Measurements. — Male:^ Wing, 176-189 (average, 183.2) mm.; tail, 

 63-72.5 (69.2); exposed culmen, 60.5-66.5 (63.7); height of bill at 

 base, 11-13.5 (12.3); tarsus, 51-58 (53.8); middle toe, 44-48.5 (47.3). 



Female:^ Wing, 176.5-182.5 (180.0); taU, 66.5-73.5 (70.0); 

 exposed culmen, 62.5-66.5 (64.9) ; height of bill at base, 12-13 (12.5); 

 tarsus, 51-56 (52.9); middle toe, 46-47.5 (46.8). 



Type-locality. — La Paz, Lower California, Mexico. ^ 



GeograpTiical distribution. — Southern and central Ijower California: 

 south to La Paz, southern Lower California; and north to San 

 Ignacio, central Lower California. 



The Juvenal plumage is very deeply colored, particularly on the 

 lower parts, and differs from the corresponding stage of Butorides 

 virescens virescens in its darker hind neck, foreneck, sides of neck, and 

 streaks of lower parts. 



In the series of adults examined the colors are very uniform. The 

 female averages somewhat smaller than the male. This race occupies 

 a restricted area in southern and central Lower California, where it is 

 apparently resident throughout the year. Its center of distribution 

 appears to be the vicinity of La Paz Bay, but it has occurred as far 

 north as San Ignacio, in the central portion of the penmsula (north 

 and south); and a smgle adult male from the latter locality (No. 

 196339, U.S.N.M.), taken October 11, 1905, by Messrs. E. W. Nelson 

 and E. A. Goldman, is practically typical. 



Fourteen specimens examined, from the localities below, breeding 

 records being indicated by an asterisk: 



Lower California. — La Paz;* San Ignacio; San Jose Island;* 



Puerto Balandra. 



■ -"""""—" ~~~— ~ " ~ 



1 Ten specimens, from southern Lower California. 



2 Four specimens from southern Lower California. 



