Miller (1955a:174) reported that the Black-headed Grosbeak first appeared in the Sierra del Carmen on April 13 and was soon seen patrolling territories. He remarked that these specimens from the Sierra del Carmen conformed adequately with the rather poorly differentiated race _P. m. melanocephalus_ and stated that Marsh took an immature male at Jardin del Sur on September 7. Oberholser (1919b:416) listed _Hedymeles melanocephalus papago_ (=_P. m. melanocephalus_) from Sierra Guadalupe on April 27. Dickerman saw Black-headed Grosbeaks in the Sierra del Pino on May 12, 1954, and 16 mi. E and 18 mi. N Ocampo on May 7, 1954. The size of No. 31664 represents the characters of _P. m. melanocephalus_ as presented by Oberholser (1919b:413). No specimen of _P. m. melanocephalus_ from Coahuila, to my knowledge, approaches _P. m. maculatus_. The size of the testes (7x5 mm.) of No. 31664 suggests breeding by this subspecies in the Sierra Guadalupe. *_Guiraca caerulea interfusa_ Dwight and Griscom.--_Specimens examined:_ total 2: [Male] 32138 from 12 mi. N, 12 mi. W Jimenez, 850 ft., June 18, 1952; and [Female] 32139 from 2 mi. W Jimenez, 850 ft., June 21, 1952. Burleigh and Lowery (1942:206) recorded this Blue Grosbeak from "about twenty miles west of Saltillo" on April 22. Miller (1955a:174) stated that Marsh obtained a male _G. c. interfusa_ at Vivoras Spring on August 3. Miller, Friedmann, Griscom, and Moore (1957:334) remarked that the Blue Grosbeak breeds in the northern and eastern sections and reported _G. c. interfusa_ from Hipolito on July 2. Amadon and Phillips (1947:580) reported examining material from Sabinas referable to _G. c. interfusa_. Dickerman saw Blue Grosbeaks 4 mi. N San Isidro on May 10, 1954. Findley saw Blue Grosbeaks 4 mi. W Jimenez on June 19, 1952, and 2 mi. S and 3 mi. E San Juan de Sabinas on June 22, 1952. Nos. 32138-32139 are typical representatives of _G. c. interfusa_. The size of the testes (12 mm.) of No. 32138, the size of the largest ovum (2 mm.) of No. 32139, and the dates (June 18, 21) on which they were collected are evidence of breeding by this subspecies. **_Guiraca caerulea eurhyncha_ Coues.--Amadon and Phillips (1947:580) obtained an adult male of this Blue Grosbeak from Las Delicias on August 12. This subspecies, according to Miller, Friedmann, Griscom, and Moore (1957:334), is resident at middle and lower elevations through most of central and southern Mexico. Except for the occurrence of intergrades of _G. c. interfusa_, _caerulea_, and _eurhyncha_ in southern Nuevo Leon and Tamaulipas (Miller, Friedmann, Griscom, and Moore, 1957:335), the record from Las Delicias represents the northern limit of the range of the subspecies _eurhyncha_. *_Passerina cyanea_ (Linnaeus).--_Specimen examined:_ one, [Male] 31544, from San Marcos, May 5, 1954.