Sutton and Burleigh
(1939a:39) found _V. h. stephensi_ fairly common at Diamante Pass on
March 6. Ridgway (1904:198) recorded _V. h. stephensi_ from Sierra
Guadalupe in April.

*_Vireo huttoni carolinae_ Brandt.--_Specimens examined:_ total 3:
[Male] 31588 from 20 mi. S Ocampo, 6500 ft., April 5, 1954, weight, 11
gms.; [Female] 32851 from 13 mi. E San Antonio de las Alazanas, July 6,
1955, weight, 14.2 gms.; and [Female] 32102 from 7 mi. S, 4 mi. E Bella
Union, 7200 ft., June 25, 1952.

To my knowledge, _V. h. carolinae_ is the only resident subspecies of
Hutton's Vireo in Coahuila. Burleigh and Lowery (1942:202) found _V. h.
carolinae_ in rather limited numbers in the woods bordering the summit
of Diamante Pass. Miller (1955a:172) remarked that the subspecies
_carolinae_ was a common bird from 6500 feet to 8000 feet in the Sierra
del Carmen. Miller (_loc. cit._) took a female on April 12 that was
nearly ready to lay and said that his specimens of _carolinae_ from the
Sierra del Carmen seem to be separate from _V. h. stephensi_ and _V. h.
mexicanus_. Our specimens showed no overlapping of characters with _V.
h. stephensi_ and _V. h. mexicanus_. The size of the largest ovum (2
mm.) of No. 32102 and the dates (June 25, and July 6) on which Nos.
32102 and 32851 were obtained suggest that _V. h. carolinae_ is a
resident in Coahuila.

*_Vireo bellii medius_ Oberholser.--_Specimen examined:_ one, [Male]
31495, from San Marcos, May 5, 1954, measurements: wing, 56 mm.; tail,
48 mm.; culmen, 9.5 mm.; tarsus, 18 mm.

Although Bell's Vireo seems to have been observed uncommonly in
Coahuila, this species does breed in the State. Burleigh and Lowery
(1942:202) obtained a single female _V. b. medius_ on April 20 "in an
arroyo east of Saltillo" and found this subspecies "not uncommon in the
open desert twenty miles west of Saltillo, where three singing males
were secured." Miller, Friedmann, Griscom, and Moore (1957:226)
recorded _V. b. medius_ in breeding condition at Hipolito from June 30
to July 3. Ridgway (1904:207) recorded the subspecies from Monclova.
Hardy saw a Bell's Vireo at Parras on July 4, 1955. The size of No.
31495 is typical for _V. b. medius_.

*_Vireo flavifrons_ Vieillot.--_Specimen examined:_ one, [Male] 32103,
from 2 mi. W Jimenez, 850 ft., June 20, 1952.

Van Hoose (1955:302-303) suggested that the occurrence of No. 32103 in
Coahuila is evidence of a southward extension of the range of the
Yellow-throat