The sizes of Nos. 32073-32077 and 31605-31606 (wing, 98.0-101.5 mm., averaging 99.7 mm.), the bright yellow throat, and the vinaceous color of the hindneck characterize clearly the subspecies _diaphora_. The sizes of the testes (9x6 mm.; 8x5 mm.; 10x6 mm.; 8x4 mm.; 11x6 mm.) of Nos. 32073-32077, the size of the largest ovum (6.5 mm.) of No. 32079, and the juvenile (32078) are evidence of breeding of _E. a. diaphora_ in Coahuila. *_Tachycineta thalassina thalassina_ (Swainson).--_Specimens examined:_ total 3: [Male] 31471, [Male] 31473, and [Female] 31472 from Sierra del Pino (=5 mi. S, 3 mi. W Acebuches), May 15, 1954, measurements: wings, 125, 118, 108 mm.; tails, 56, 54, 46 mm. The two subspecies of the Violet-green Swallow, _thalassina_ and _lepida_, intergrade in Coahuila. Specimens from different localities in the State represent various stages of intergradation between the two subspecies; generally those from northern Coahuila seem to be closer to _T. t. lepida_, and those from southern Coahuila are closer to _T. t. thalassina_. Nos. 31471-31473 are intergrades between _T. t. thalassina_ and _T. t. lepida_; in size the three resemble _T. t. thalassina_, but in green, rather than purple, backs and scapulars resemble _T. t. lepida_. The rumps of Nos. 31471-31473 show some purple with the green, but are nearer _thalassina_ in this character. Gonadal sizes (testes 10x7, 10x8 mm., one ovum 6 mm.) indicate that the Violet-green Swallow breeds in the Sierra del Pino. *_Tachycineta thalassina lepida_ Mearns.--Miller (1955a:167) reported that Violet-green Swallows taken in Boquillas Canyon of the Sierra del Carmen are intermediate between _T. t. lepida_ and _thalassina_; however, he referred his sample to _lepida_ on the basis of short wing. _Iridoprocne bicolor_ (Vieillot).--Miller, Friedmann, Griscom, and Moore (1957:114) reported the Tree Swallow from Hipolito on February 22. _Stelgidopteryx ruficollis psammochrous_ Griscom.--Miller, Friedmann, Griscom, and Moore (1957:111) reported this subspecies of the Rough-winged Swallow from Saltillo. *_Hirundo rustica erythrogaster_ Boddaert.--Burleigh and Lowery (1942:195) stated that the Barn Swallow was the most abundant swallow "about Saltillo." Because these swallows occupied houses about Saltillo and neighboring villages, Burleigh and Lowery (_loc. cit._) concluded that the species nests commonly in the Saltillo area. Findley saw Barn Swallows 2 mi. S and 11 mi. E Nava, 810 feet, on June 15, 1952. Dickerman observed them at San Marcos (=20 mi. S Cuatro Cienegas) on May 4, 1954. *_Petrochelidon pyrrhonota minima_ van Rossem and Hachisuka.--_Specimens examined:_ total 2: [Male] [Male] 31585-31586 from 14 mi. W San Antonio de las Alazanas, April 9, 1954.