_Parula americana_ (Linnaeus).--Miller (1955a:172) obtained a migrant Parula Warbler in an oak grove at 7000 feet on April 16 in the Sierra del Carmen, and remarked that it was "apparently the first record of this species in Coahuila." *_Parula pitiayumi nigrilora_ Coues.--The AOU Check-list Committee (1957:486) recorded this subspecies of the Olive-backed Warbler as a resident at Sabinas. *_Peucedramus taeniatus arizonae_ Miller and Griscom.--This subspecies of the Olive Warbler is locally common in Coahuila. Miller (1955a:172) found _P. t. arizonae_ common in the pine timber above 6800 feet in the Sierra del Carmen and suggested that this warbler breeds in these mountains. Burleigh and Lowery (1942:203) found the Olive Warbler in a thick pine wood at an elevation of 9500 to 10,000 feet and remarked that this species was "decidedly uncommon in the Diamante Pass area." They (_loc. cit._) obtained a female (not identified to subspecies) on April 23 that had a "well developed brood patch and was unquestionably incubating eggs." Sutton and Burleigh (1939a:40) took a single female at Diamante Pass on March 6 which also was not identified to subspecies. Dickerman saw Olive Warblers in the Sierra de la Madera on December 13, 1953, and 13 mi. E San Antonio de las Alazanas on April 10, 1954. _Dendroica petechia morcomi_ Coale.--Miller, Friedmann, Griscom, and Moore (1957:246) reported this subspecies of the Yellow Warbler as having been recorded from Coahuila. _Dendroica auduboni auduboni_ (Townsend).--_Specimens examined:_ total 2: [Male] 31094 (skeleton only) from Fortin (=33 mi. N, 1 mi. E San Geronimo), 3300 ft., March 29, 1952; and [Male] 31093 from 4 mi. W Hacienda La Mariposa, 2300 ft., March 25, 1952, weight, 12.3 gms. Audubon's Warbler is a common winter visitant and migrant in Coahuila. Miller (1955a:173) recorded _D. a. auduboni_ as a migrant from April 7 to 26 in the Sierra del Carmen; he found no suggestion of breeding by the Audubon's Warbler in the northwestern section of the State. One individual that Miller (_loc. cit._) obtained was extensively black and approached the characters of the subspecies _nigrifrons_ of Chihuahua. He (_loc. cit._) suggested that the black individual was taken from "part of a cline of blackness and size in which _D. a. auduboni_ of the northwest and _D. a. nigrifrons_ of Mexico are extremes." Burleigh and Lowery (1942:203) remarked that Audubon's Warbler "is doubtless a common winter bird in the area around Saltillo." Two specimens obtained by Burleigh and Lowery (_loc. cit._) "might be considered intermediate" between _auduboni_ and _memorabilis_. Sutton and Burleigh (1939a:40) saw Audubon's Warbler "in some numbers near San Pedro ... [on] January 29 and 30." Dickerman saw Audubon's Warblers 13 mi. E San Antonio de las Alazanas on April 10, 1954. Miller (1955a:173) also obtained, in the Sierra del Carmen, a hybrid between _D. coronata_ and _D. auduboni_.