NO. 9 BIRDS OF ISLA COIBA, PANAMA—WETMORE 43 
mm. The general ground color is somewhat glossy white, marked ir- 
regularly over the entire surface with spots of French gray to lilac 
gray, with a lesser number that are cinnamon drab, some of these 
scattered over the surface, but most of them grouped as a poorly 
outlined wreath around one end. Many of the spots are highly ir- 
regular in outline. On skinning the parent I found that she contained 
a second egg ready for the shell, so that the complete set is two, as 
it is in the related chuck-will’s-widow (Caprimulgus carolinensis) 
that nests in the southeastern United States. 
The five skins from Coiba Island probably represent a race peculiar 
to the island, since they are definitely brighter, more rufescent brown 
on the crown and hindneck than four others, two from the Province 
of Panama, and two from northern Colombia, that are at the present 
moment available. The Coiba series includes specimens in the two 
color phases, one grayer and one browner, usual in this species, and 
the difference indicated holds in both. However, in view of the con- 
siderable individual variation in the rufous nightjar it seems desira- 
ble to see further mainland specimens before reaching final decision 
on the Coiba series. 
Family ApopipAE: Swifts 
STREPTOPROCNE ZONARIS ALBICINCTA (Cabanis): White-collared 
Swift, Vencejo Cuelliblanco 
Hemiprocne albicincta CABANIS, Journ. flr Orn., vol. 10, May 1862, p. 165. 
(Junction of Haiama Creek and the Demerara River, British Guiana.1!) 
On January 14 I shot two from a small flock that came to drink 
at the little fresh-water lagoon at Catival. As no others were seen, 
this occurrence may be taken as an example of the wide range of 
territory covered by the fast-moving flocks of swifts, since it is 
assumed that they had crossed from the mainland. Both of the speci- 
mens are immature. One, a male, has the breast band restricted in 
size and dull white. In the other, in which I was not able to de- 
termine the sex, the feathers of the upper breast are tipped so lightly 
and so narrowly with white that the band seems to be completely 
lacking until the bird is examined closely. 
11]In the original description Cabanis proposed this name for the birds found 
from “Mexico bis Guiana” without selecting a type. Zimmer, Amer. Mus. Nov., 
No. 1609, Feb. 25, 1953, p. 3, has designated the type locality as given above. 
It is to be noted in this connection that Ridgway, U. S. Nat. Mus. Bull. 50, 
pt. 5, 1911, p. 698, in discussion of this race had already suggested “Guiana.” 
