BIRDS FROM BRAZIL AND SOUTHERN VENEZUELA—FRIEDMANN 413 
This is the original series on which the description of N. 1. exigua 
was based. The form is similar to the nominate one of the Amazon 
Valley but is smaller (wings 128.2—136.4 in exigua as against 139-142 
in leucopyga) and darker, the upperparts with the blackish marks 
larger and with the pale buffy marks on the outer webs of the remiges 
and rectrices reduced in size and frequency. The known range of 
exigua is from the upper stretches of the Orinoco (opposite Corocoro 
Island) south to the northern part of the Brazo Casiquiare (at the 
mouth of the Rio Pacila), extreme southern Venezuela. 
NYCTIPROGNE LATIFASCIA Friedmann: Blackish Small-billed Nighthawk 
Nyctiprogne latifascia FR1EDMANN, Proc. Biol. Soc. Washington, vol. 58, 1945, 
p. 118 (Raudal Quirabuena, Brazo Casiquiare, Venezuela). 
SPECIMENS COLLECTED 
1 ad. @, Venezuela, San Carlos, Rio Negro, January 27, 1931. 
4 ad. #, 2 ad. 9, Venezuela, Raudal Quirabuena, Brazo Casiquiare, February 
5, 1931. 
Most of the specimens were in breeding condition when collected, 
according to the notes on their labels. 
One of the males from Raudal Quirabuena is the type of this 
species, the whole series are paratypes. This nighthawk is similar to 
Nyetiprogne leucopyga exigua in size (males very slightly larger, the 
females more noticeably so), but the remiges and rectrices have no 
buffy transverse marks on their outer webs, the dark terminal area 
of the tail (from the white band to the tip of the tail) is much broader 
(47-51 mm. wide as against 30-40 mm. in ezigua or typical leucopyga), 
and the coloration above and below is much darker, more blackish, 
less vermiculated with tawny-buff, the crown, occiput, and upper 
back being practically solid fuscous-black in latzfascia. 
This form is known only from extreme southern Venezuela, from 
San Carlos on the uppermost reaches of the Rio Negro north to 
Raudal Quirabuena, on the Brazo Casiquiare. The present limits 
of the ranges of this bird and of N. leucopyga exigua are indeed difficult 
to explain except by the accident of collecting. As far as known 
there are no barriers to effect any spatial isolation between these birds 
and exigua, and it may well be that future collecting will find two to 
occur together. I know of no other case where two closely allied 
forms divide the Brazo Casiquiare between them. The whole, rather 
short extent of that stream seems to show no local variation in any 
of its birds. 
An additional specimen from the Brazo Casiquiare, at Raudal 
Quirabuena, taken February 5, was preserved in alcohol. 
PODAGER NACUNDA MINOR Cory: Northern Nacunda Nighthawk 
Podager nacunda minor Cory, Publ. Field Mus. Nat. Hist., Orn. Ser., vol. 1, 
1915, p. 300 (Béa Vista, Rio Branco, Brazil). 
