mante Valley on April 23 and remarked that the
departure of these birds in spring was "extremely late."

_*Cassidix mexicanus prosopidicola_ Lowery.--_Specimens examined:_
total 3: [Female] 32893 from Parras, July 4, 1955, weight, 98.8 gms.;
and [Male] [Male] 35418-35419 from Torreon, January 8, 1954.

This subspecies of Boat-tailed Grackle has been recorded from several
localities in Coahuila. In southeastern Coahuila, Burleigh and Lowery
(1942:205-206) noted this grackle "somewhat local in its distribution;
it was found in cultivated fields about the towns and villages." These
authors noted it at Saltillo, the Chorro del Agua, and "occasionally in
the open valley south of Diamante Pass" and obtained specimens from
"near Saltillo" and Diamante Valley. On August 18 Amadon and Phillips
(1947:579) found _C. m. prosopidicola_ at Las Delicias where "a fledged
young was noticed begging for food...." Lowery (1938:4) recorded one
specimen of _C. m. prosopidicola_ from Monclova. Findley saw
Boat-tailed Grackles 2 mi. W Jimenez on June 19, 1952, and 2 mi. S and
11 mi. E Nava on June 15, 1952.

The distribution and intergradation of Boat-tailed Grackles in Coahuila
is presently poorly understood. _C. m. prosopidicola_ from southeastern
Coahuila may approach _C. m. mexicanus_, and there is probable
intergradation of _prosopidicola_ with _monsoni_ in northwestern
Coahuila (Phillips, 1950:78).

_Molothrus ater ater_ (Boddaert).--_Specimen examined:_ one, [Female]
31513, from 21 mi. S, 11 mi. E Australia, 4400 ft., May 3, 1954,
measurements: wing, 102 mm.; tail, 64 mm.; tarsus, 26 mm.; culmen, 17
mm.

This subspecies of the Brown-headed Cowbird is uncommon in Coahuila.
Amadon and Phillips (1947:579) took an adult male and a juvenile female
_M. a. ater_ at Las Delicias on August 15, both of which were
considered early migrants. Dickerman obtained No. 31513 from a flock of
eight cowbirds. Although the measurements of this specimen agree
equally well with those of _M. a. ater_ and _M. a. artemisiae_
(Grinnell, 1909:275-281), the shape of the bill most closely resembles
that of _ater_. Grinnell (1909:278) said that "_ater_ has a tumid bill,
broad and high at [the] base with [a] conspicuously arched culmen"
whereas "_artemisiae_ has a longer and relatively much slenderer bill,
vertically shallow at [the] base and laterally compressed, with the
culmen in its greater portion straight or even slightly depressed." The
size of the ovary