The sizes of the testes (9-12 mm.) and of the largest ova (14 mm. in diameter and an egg 23 mm. long) of birds labeled with reference to Cuatro Cienegas indicate breeding activity. **_Callipepla squamata castanogastris_ Brewster.--_Specimen examined:_ one, [Male] 32028, from 9 mi. S, 11 mi. E Sabinas, June 14, 1952. Typical representatives of _C. s. castanogastris_ in Coahuila occur only in the extreme northeastern section of the State, and most specimens of the Scaled Quail from northeastern Coahuila are intergrades between _pallida_ and _castanogastris_. No. 32028 is identified as _C. s. castanogastris_ because there is a distinct rusty chestnut patch on its abdomen. This patch, nevertheless, is not so large as in a more nearly typical male _C. s. castanogastris_ from 15 mi. NNW Anahuac, Nuevo Leon. **_Callipepla squamata squamata_ (Vigors).--_Specimens examined:_ total 2: [Male] 30231 and [Female] 30232 from 10 mi. NW San Lorenzo, 4200 ft., February 3, 1951. The subspecies _squamata_ occurs in southern Coahuila. Amadon and Phillips (1947:577) took a Scaled Quail at Las Delicias on August 18 that "was only two-thirds grown, though well able to fly" and obtained an adult 19 mi. W Saltillo that was typical _squamata_. Burleigh and Lowery (1942:188) stated that _C. s. squamata_ was one of the characteristic birds of the open desert country of southeastern Coahuila. Scaled Quail were seen by Burleigh and Lowery (_loc. cit._) "about Saltillo and in the open valley south of Diamante Pass." The breast and upper back of both specimens from 10 mi. NW San Lorenzo, are plumbeous-gray rather than pale dull gray. Also the lower back, rump, abdomen, forehead, and crown more closely resemble the subspecies _squamata_ rather than _C. s. pallida_. However, the upper backs of both specimens are not so plumbeous-gray as on a male (32030) and a female (32031) of the subspecies _squamata_ from 1 mi. N Chorro, Durango, 6450 ft., July 11, 1952. The two birds from Durango appear to be slightly darker than the Coahuilan specimens that approach the subspecies _pallida_. Burleigh and Lowery (1942:188-189) stated that one of their specimens of _C. s. squamata_ obtained at Saltillo seems to be "very close to _castanogastris_, suggesting that southeastern Coahuila is in the region of intergradation between the two races." Aldrich and Duvall (1955:17) indicated that _squamata_ and _castanogastris_ intergrade near Sabinas. The two specimens that I have examined show no sign of approach toward _castanogastris_. More specimens of Scaled Quail from Coahuila are needed to permit accurate definition of the distribution of the subspecies.