**Ardea herodias Linnaeus.—Two subspecies of the Great Blue Heron, treganzai and wardi, have been recorded from Coahuila. Friedmann, Griscom, and Moore (1950:27) listed A. h. treganzai from the State; presumably this subspecies occurs widely in low density. They (loc. cit.) remarked also that a record of A. h. wardi from Coahuila "cannot be allocated subspecifically."
Dickerman saw two Great Blue Herons in a marshy area at San Marcos (=20 mi. S Cuatro Ciénegas) on May 4, 1954. Van Tyne and Sutton (1937:12) noted the Great Blue Heron "near Boquillas [Texas], along the Río Grande, on May 10 and 15...."
**Butorides virescens (Linnaeus).—Olmstead saw a Green Heron at Boquillas, 700 feet, on March 10, 1952. Findley reported seeing Green Herons 2 mi. W Jiménez, 850 feet, on June 19, 1952, and 2 mi. S and 3 mi. E San Juan de Sabinas on June 22, 1952.
**Casmerodius albus egretta (Gmelin).—The Common Egret is an uncommon migrant in Coahuila. Friedmann, Griscom, and Moore (1950:30) recorded C. a. egretta from the "extreme northern part" of Coahuila. Van Tyne and Sutton (1937:12) saw the Common Egret "along the Río Grande on the Graham ranch just west of Boquillas," Texas, on May 16, which might well be the locality to which Friedmann, Griscom, and Moore referred. Olmstead saw a Common Egret at Don Martín on March 22, 1952.
**Nycticorax nycticorax hoactli (Gmelin).—This subspecies of the Black-crowned Night Heron was listed from the "extreme north" section of Coahuila by Friedmann, Griscom, and Moore (1950:32). Van Tyne and Sutton (1937:14) saw three Black-crowned Night Herons along the Río Grande about two miles west of Boquillas, Texas, on May 16. This record probably represents the locality to which Friedmann, Griscom, and Moore (op. cit.) referred.
Nyctanassa violacea violacea (Linnaeus).—A Yellow-crowned Night Heron in immediate post-juvenile plumage, No. 36413, was obtained on September 7, 1958, 16 km. south of Cuatro Ciénegas, by W. L. Minckley. According to him the bird was accompanied by "several" other herons seemingly of the same species and condition of plumage. The species seems not to have been recorded previously from Coahuila [Eds.].
Botaurus lentiginosus (Rackett).—Friedmann, Griscom, and Moore (1950:34) listed the American Bittern from the "extreme northern part" of Coahuila. Van Tyne and Sutton (1937:14) saw two representatives of this bittern "along the Río Grande not far from Hot Springs," Texas, on May 15. I suspect that this is the locality to which Friedmann, Griscom, and Moore (loc. cit.) referred.
[Branta canadensis leucopareia (Brandt).—Friedmann, Griscom, and Moore (1950:38) listed B. c. leucopareia from "northern Coahuila.">[
**Dendrocygna autumnalis (Linnaeus).—Evenden (1952:112) reported a Black-bellied Tree Duck standing beside a reservoir in southern Coahuila along the railroad between Saltillo, Coahuila, and Avalos, Zacatecas.
**Anas platyrhynchos Linnaeus.—On March 30, 1952, Olmstead recorded a Mallard from 10 mi. E Hacienda La Mariposa, 2000 feet.