524 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 97 
SPECIMENS COLLECTED 
lad. 2, Brazil, Cachoeira Destacamento, Rio Cauabury, Amazonas, December 
14, 1930. 
lim. o, 2ad. 9, lim. 9, 1im.-, Brazil, Sa0 Gabriel, Rio Negro, Amazonas, 
January 9-19, 1931. 
lad. 9, Venezuela, Puerto Ayacucho, January 6, 1930. 
lim. @, Venezuela, Isla Yagrumo, Rio Negro, Amazonas, January 25, 1931. 
lad. o&, Venezuela, Raudal San Sebastidn, Brazo Casiquiare, February 2, 1931. 
Two of the immature birds have the entire upperparts dark dull 
brown with the bluish-black feathers of the adult plumage coming in 
on the lesser upper wing coverts, apparently the first area to be affected 
by the molt. Of the other two immature examples one is indis- 
tinguishable from the adults, its immaturity being the judgment of 
the collector from unrecorded evidence; the other is in an advanced 
state of postjuvenal molt. 
This species was made the type and only member of the genus 
Diplochelidon by Ridgway (Proc. Biol. Soc. Washington, vol. 16, 1903, 
p. 106) but it seems preferable to “lump” this generic split with 
Aiticora as has been done by most recent authors. 
The colored figure of this species in Sharpe and Wyatt’s monograph 
of the swallows (vol. 2, 1888, pl. 98) shows a greater development of 
the posteriorly projecting midventral extension of the dark breast 
band than do the present specimens. 
At Raudal San Sebastién Holt collected one set of eggs (three eggs) 
of this swallow from a nest in a sand bank. 
HIRUNDO RUSTICA ERYTHROGASTER Boddaert: Barn Swaliow 
Hirundo erythrogaster BoppaERtT, Table des planches enluminéez . . ., 1783, p. 45 
(Cayenne). 
SPECIMEN COLLECTED ~ 
1 ad. o&, Brazil, Santa Isabel, Rio Negro, Amazonas, October 10, 1930. 
Although labeled as an adult this specimen is really a younger bird 
in process of acquiring mature plumage. 
IRIDOPROCNE ALBIVENTER (Boddaert): White-winged Swaliow 
Hirundo albiventer BoppaErt, Table des planches enluminéez, 1783, p. 32 (Cay- 
enne). 
SPECIMENS COLLECTED 
3 ad. o, 1 im. -, Brazil, Sio Gabriel, Rio Negro, December 30, 1930—January 
12, 1931. 
lim. ?, Venezuela, Buenos Aires, Brazo Casiquiare, February 21, 1931. 
The immature female from the Brazo Casiquiare is gray above 
except for the rump and the broad white markings on the wings. One 
of the Sao Gabriel birds, taken January 3, is a young bird just from 
the nest, not yet quite grown, sex not indicated. It has a slight 
bluish tinge on the back. An adult male examined has blue and 
