The Scaled Quail is common in Coahuila. The subspecies _pallida_ occurs in northwestern Coahuila south to Sierra de los Alamitos. Intergrades of _pallida_, _castanogastris_, and _squamata_ are present in the central part of the State. No. 32640, obtained 2 mi. W Paila, has some resemblance to _squamata_. Five specimens of _pallida_ from the central part of Coahuila (5 mi. N and 19 mi. W Cuatro Ciénegas), show little or no approach toward _squamata_. Miller (1955a:162) stated that two of the Scaled Quail collected in the Sierra del Carmen show no approach to the race _castanogastris_ of eastern Coahuila nor to _C. s. squamata_ of southern Coahuila. From the specimens that I have examined, I judge that the range of _pallida_ extends as far south as the Sierra de los Alamitos rather than only to the northwestern part of Coahuila as reported by Aldrich and Duvall (1955:17). In northeastern Coahuila _pallida_ seems to intergrade with _castanogastris_; No. 29414 has an indistinct rusty chestnut patch on its abdomen, thus resembling _castanogastris_.
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 Ciénegas 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 León.
**_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."