0 ft., July 6,
1952.

Specimens of the Lesser Nighthawk, subspecies _C. a. texensis_, have
been recorded in the literature from representative localities
throughout most of Coahuila. Burleigh and Lowery (1942:190-191)
obtained, on April 18, at "a small pond at the edge of Saltillo," one
male that was exceedingly fat; they (_loc. cit._) suggested that their
specimen was a migrant. Goldman (1951:377, 389) stated that _C. a.
texensis_ occupied the Lower and Upper Sonoran and Upper Austral
life-zones of Coahuila. Dickerman saw Lesser Nighthawks at San Marcos
(=20 mi. S Cuatro Cienegas) on May 4, 1954. Van Tyne and Sutton
(1937:41) reported that the Lesser Nighthawk was common throughout the
lower parts of the Big Bend in Texas. This is probably true for
northwestern Coahuila as well.

The presence of an egg in the oviduct of No. 32045 and the dates (May
6, June 20, and July 6) on which Nos. 31442, and 32044-32046 were
obtained indicate breeding by this species in Coahuila.

**_Aeronautes saxatalis saxatalis_ (Woodhouse).--_Specimen examined:_
one, [Male] 31672, from Pico de Jimulco, 5600 ft., April 5, 1953,
weight, 35 gms.

Burleigh and Lowery (1942:191) found the White-throated Swift to be
common at "the summit of Diamante Pass and on the nearby ridges."
Miller (1955a:164) saw the species from 4800 feet up to the crest of
the Sierra del Carmen. Several White-throated Swifts were seen flying
overhead at Pico de Jimulco on April 5.

No specimens of _A. s. sclateri_ from Mexico are known. Miller
(1955a:165) listed one specimen with dimensions (wing, 145 mm.) that
approaches _sclateri_. The measurements of No. 31672 (wing, 143 mm.;
tail, 58 mm.) also approach the dimensions of specimens of _sclateri_
but are best referred to _A. s. saxatalis_.

**_Calothorax lucifer_ (Swainson).--Burleigh and Lowery (1942:191)
obtained a male Lucifer Hummingbird at the Chorro del Agua on April 19.
Van Tyne and Sutton (1937:43) reported a male from the Rio Grande (=3
mi. W Boquillas, Texas).

_Archilochus colubris_ (Linnaeus).--Friedmann, Griscom, and Moore
(1950:180) remarked that the Ruby-throated Hummingbird is a moderately
common migrant, wintering from sea level to 9350 feet throughout
Mexico, except in a few states. The only published record of a specimen
of this hummer in the State is of a male taken on April 22 in a small
arroyo twenty miles west of Saltillo (Burleigh and Lowery, 1942:191).

*_Archilochus alexandri_ (Bourcier