orthwestern 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 Cienegas), 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 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