GREEN HERON. 59 



In spring migration the earliest appearance at Tombstone, Ariz., 

 was on April 22, 1909 (Willard) ; Sebastopol, Cal., March 12, 1885 

 (Belding) ; Stockton, Cal., average April 9, earliest April 4, 1885 

 (Belding). Eggs are in the U. S. National Museum that were taken 

 May 24, 1890, at Silver Lake, near Tucson, Ariz., and eggs were taken 

 on the Sespe Eiver, Ventura County, Cal.j May 12, 1910 (Peyton). 



Frazar Green Heron. Butorides virescens frazari (Brewster). 



The Frazar green heron is restricted to the southern end of Lower 

 California, where it is resident at La Paz, in the region around Mag- 

 dalena Bay and north to San Ignacio (Nelson and Goldman). Eggs 

 were taken near La Paz May 8 to 26, 1910 (Thayer). 



Green Heron. Butorides virescens (subspp.). 



The two forms of the green heron virescens and anthonyi are the 

 only ones that occur in the United States. These two forms include 

 the migratory green herons, which have a wide range and perform 

 migrations extending often more than a thousand miles. In south- 

 ern Central America, northern South America, and throughout the 

 whole of the West Indies the green herons seem to be strictly resi- 

 dent, and as a consequence they have become modified into a large 

 number of local forms or subspecies. 



Mr. H. C. Oberholser has recently made an extended study of the 

 green herons, and his conclusions as to the ranges of the various 

 forms are given below : 



Chihuahua Green Heron, Butorides virescens eremonomus Ober- 

 holser. Chihuahua and Durango, Mexico, in summer; south to 

 Michoacan, Mexico, in winter. 



Nicaragua Green Heron, Butorides virescens mesatus Oberholser. 

 Western Nicaragua. 



Panama Green Heron, Butorides virescens hypernoteus Oberholser. 

 Costa Rica, Panama, and northern South America, south to Medellin, 

 Colombia, and Para, Brazil. 



Swan Island Green Heron, Butorides virescens saturatus Ridgway. 

 Swan Island, Caribbean Sea. 



San Miguel Green Heron, Butorides virescens margaritophilus 

 Oberholser. San Miguel Island, Panama. 



Bahama Green Heron, Butorides virescens bakamensis (Brewster). 

 The Bahama Islands. 



Cuba Green Heron, Butorides virescens cubanus Oberholser. The 

 Greater Antilles and east in the Lesser Antilles to Guadeloupe Island. 



St. Christopher Green Heron, Butorides virescens christophorensis 

 Oberholser. St. Christopher Island, Lesser Antilles. 



Dominica Green Heron, Butorides virescens dominie anus Ober- 

 holser. Dominica Island, Lesser Antilles. 



