BIRDS FROM BRAZIL AND SOUTHERN VENEZUELA—FRIEDMANN 417 
Family APODIDAE: Swifts 
CHAETURA SPINICAUDA AETHALEA Todd: Todd’s Spine-tailed Swift 
Chaetura spinicauda aethalea Tovp, Proc. Biol. Soc. Washington, vol. 50, 1937, 
p. 183 (Benevides, Pard, Brazil). 
SPECIMEN COLLECTED 
1 ad. o, Venezuela, Chapazon, right bank of Brazo Casiquiare, January 30, 
1931. 
The lone example of this swift secured was noted as being in breeding 
condition when collected. 
No material of C. s. aethalea has been available for comparison, but 
Dr. J. T. Zimmer has kindly compared this specimen with an example 
from the Tocantins in the American Museum of Natural History. 
He writes me that the two agree in all essential details although the 
sexes are different. The present bird is a trifle larger, but both are 
even more definitely larger than the average of C. s. spinicauda; 
although not much larger than the maximum extreme of that form. 
Both are distinctly darker on the underparts, both having a definitely 
whitish throat and both have more gray on the shorter upper tail 
coverts. Our specimen has the following dimensions: Wing 108, 
tail 40, culmen from base 5.5 mm. 
This specimen extends the known range of the subspecies consider- 
ably to the north and constitutes an addition to the known avifauna 
of Venezuela. 
AERONAUTES MONTIVAGUS TATEI (Chapman): Tate’s Swift 
Duidia tatei CHapman, Amer. Mus. Nov., No. 380, 1929, p. 11 (High Point Camp, 
Mount Duida, Venezuela, 7,100 feet). 
SPECIMENS COLLECTED 
lad. 9, 1im.-, Brazil, Serra Imeri, near Salto do Hud, December 3-9, 1930. 
These two specimens constitute a small southwestern extension 
of the known range of this swift and add it to the recorded avifauna 
of Brazil. Previously it was known only from Mount Duida and 
Mount Auy4n-tepuf, although it probably occurs in the Guiana 
highlands as well. The present records are more remarkable in 
that they come from a lowland area; in other words they extend 
the known range of the bird more extensively altitudinally than 
geographically. 
The immature bird is much darker, more blackish, less brownish 
above than the adult female, and it may be a male. The dimensions 
of the two are as follows: ad. 9—wing 116, tail 41, culmen from base 
7.5 mm.; immature unsexed—wing 113, tail 40, culmen from base 
7.4 mm. 
I am indebted to Dr. J. T. Zimmer for comparing these specimens 
with material of tatei in the American Museum of Natural History. 
