stern Coahuila.

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
Swall