This subspecies of the Solitary Vireo is an uncommon migrant or winter visitant to Coahuila. Dickerman obtained No. 31540, whose skull was unossified and whose ovary was small, in an oak and palm habitat. The bright yellow flanks, large and yellow wing bars, and the uniform olive green back indicate that this specimen is a typical representative of _V. s. solitarius_. This subspecies was previously unrecorded in Coahuila. _Vireo solitarius cassinii_ Xantus.--_Specimens examined:_ total 2: [Female] 35408 (skeleton only) from 5 mi. W, 3 mi. S Acebuches, 6200 ft., May 12, 1954; and [Male] 31589 from 20 mi. S Ocampo, 6200 ft., April 4, 1954, measurements: wing, 75 mm.; tail, 57 mm.; culmen, 10.5 mm.; weight, 14 gms. This subspecies of the Solitary Vireo seems to be uncommon in Coahuila. No. 31589 provides the first record of _V. s. cassinii_ in Coahuila. Van Hoose has (1955:303) erroneously reported that Dickerman obtained No. 31589 on July 4, 1954; the correct date is April 4, 1954. Although the size of No. 31589 is large for _V. s. cassinii_, the color (sides and flanks with less yellow, more olive; narrow white wing bars) resembles that of typical representatives of _cassinii_. The testes of No. 31589 were not enlarged. Dickerman suggested that the female from 5 mi. W and 3 mi. S Acebuches showed some resemblance to _V. s. plumbeus_. This is not to be unexpected since the subspecies _plumbeus_ has been reported from the Chisos Mountains of Texas (Van Tyne and Sutton, 1937:82) and from northern Chihuahua (Miller, Friedmann, Griscom, and Moore, 1957:227). *_Vireo olivaceus_ (Linnaeus).--_Specimen examined:_ one, [Male] 32104, from 12 mi. N, 12 mi. W Jimenez, 850 ft., June 19, 1952. The Red-eyed Vireo has been uncommonly reported from eastern Coahuila. Miller, Friedmann, Griscom, and Moore (1957:229) recorded _V. olivaceus_ from Sabinas on May 22 and from Las Vacas Creek on June 7 as late spring migrants. Hellmayr (1935:131) listed the Red-eyed Vireo from northern Coahuila. Findley saw a Red-eyed Vireo 2 mi. W Jimenez on June 19, 1952. The size of the testes (5x3 mm.) of No. 32104 and the date (June 19) on which it was obtained indicate that the Red-eyed Vireo possibly breeds in northeastern Coahuila; if so, this is the first breeding record of the Red-eyed Vireo in Coahuila. _Vireo gilvus gilvus_ (Vieillot).--This subspecies of the Warbling Vireo is an uncommon migrant in Coahuila. Miller, Friedmann, Griscom, and Moore (1957:232) recorded _V. g. gilvus_ from 12 mi. W Saltillo on September 28. _Mniotilta varia_ (Linnaeus).--_Specimen examined:_ one, [Male] 31662, from the north slope of Sierra Guadalupe (=11 mi. S, 7 mi. W General Cepeda), 7800 ft., April 20, 1953, weight, 10 gms., testes not enlarged.