*_Coccyzus americanus americanus_ (Linnaeus).--_Specimens examined:_ total 2: [Male] [Male] 32037-32038 from 12 mi. N, 12 mi. W Jimenez, 850 ft., June 19, 1952, measurements: wing, 141, 146 mm.; tail, 142, 149 mm.; tarsus, 27, 27 mm.; culmen, 25, 24 mm. In Coahuila, the Yellow-billed Cuckoo seems to be uncommon. It occurs in the northeastern section of the State, in the Gulf Coastal Plain (Baker, 1956:128), and probably breeds there. One subspecies, _americanus_, has been recorded from Coahuila. According to Ridgway (1916:13-17) the difference between _C. a. americanus_ and _C. a. occidentalis_ is size. His (_loc. cit._) average measurements of males of _occidentalis_ are: wing, 149.6 mm.; tail, 147.1 mm.; tarsus, 26.7 mm.; and culmen, 27.7 mm. whereas average measurements given by him of males of _americanus_ are: wing, 143.6 mm.; tail, 140.7 mm.; tarsus, 25.2 mm.; and culmen, 26.4 mm. Van Tyne and Sutton (1937:35) question the value of maintaining the subspecies _occidentalis_, because individuals of _americanus_ and _occidentalis_ are almost impossible to tell apart. Friedmann, Griscom, and Moore (1950:132) stated that _americanus_ occurs in eastern North America whereas _occidentalis_ occurs in western North America. If the subspecies _occidentalis_ exists, then Nos. 32037 and 32038 are, by size, _americanus_ and No. 32038 is an intergrade between the two subspecies (or a large individual of _americanus_). The Yellow-billed Cuckoo was seen also by Findley 2 mi. S and 3 mi. E San Juan de Sabinas on June 22, 1952, and by Dickerson at Torreon on July 2, 1955. The sizes of the testes of the birds from 12 mi. N and 12 mi. W Jimenez (9, 10 mm. long) and the date (June 19) on which they occurred there indicate that the birds possibly were breeding. _Coccyzus erythropthalmus_ (Wilson).--Miller (1955a:163) reported a migrant Black-billed Cuckoo taken in the maples and basswood near a water hole in the bottom of Boquillas Canyon in the Sierra del Carmen, 5200 feet, on April 22. Friedmann, Griscom, and Moore (1950:132) reported that this cuckoo is presumably a regular transient in Mexico, but generally overlooked. *_Geococcyx californianus_ (Lesson).--_Specimen examined:_ one, [Female] 32049, from 8 mi. N, 2 mi. W Piedras Negras, June 18, 1952. Miller (1955a:163) heard several Roadrunners calling at Boquillas Canyon in the Sierra del Carmen, where he obtained two females. Burleigh and Lowery (1942:190) stated that the species proved to be "unexpectedly scarce" and was noted but once by them on April 22 when a single bird was observed in "the open desert west of Saltillo." Sutton and Burleigh (1939a:30) noted that the Roadrunner was not common anywhere in southern Coahuila; they obtained one female at San Pedro on January 29. The size of the largest ovum (15 mm. in diameter) of No. 32040 indicates that this species breeds in Coahuila.