BIRDS FROM COSTA RICA—WETMORE 49 
a rattle, is like that of the northern subspecies which I have heard in 
Mexico. The birds were alert and active, especially when I en- 
countered them in more open localities. The trogons are known here 
as wuda. 
Family ALCEDINIDAE 
CHLOROCERYLE AMAZONA MEXICANA Brodkorb 
Chloroceryle amazona mexicana Bropkors, Auk, 1940, p. 543 (Barra de Cahuacdan, 
Chiapas). 
Near Liberia these kingfishers were seen in small numbers along the 
Rio Liberia and Rio Colorado, and once one was observed at a tem- 
porary pool of water formed by recent rains. A female was taken on 
October 22. This specimen has the white mark in front of the eye 
indistinct, and a wing measurement of 135 mm. On comparing a 
fair series found in the National Museum I find that the characters 
pointed out by Brodkorb in describing this race, while slight, seem 
to hold, except that the tail measurement in birds from South America 
and in those from México and Central America is about the same. 
The development of the white streak in front of the eye is highly 
variable but has its maximum extent in South American birds. It 
may, however, be absent in specimens from that area. Following are 
measurements from our series: 
C. a. amazona: 
Males (10 specimens), wing 122-132, tail 69.7—79.6. 
Females (13 specimens), wing 125-137, tail 72.5—-82.3. 
C. a. mexicana: 
Males (11 specimens), wing 129-140, tail 70.8—77.6. 
Females (12 specimens), wing 132-142, tail 74.4-78.8. 
It will be noted that though the smallest birds come from South 
America there is a definite overlap. Birds from Colombia are inter- 
mediate but seem to me closer to true amazona, which apparently 
should cover all specimens north to Panama. 
CHLOROCERYLE AMERICANA ISTHMICA (Goldman) 
Ceryle americana isthmica GOLDMAN, Smithsonian Misc. Coll., vol. 56, No. 27, 
Dec. 1, 1911, p. 1 (Rfo Indio, near Gatun, Canal Zone). _ 
Two females of the green kingfisher were taken near Liberia, one 
over a sluggish channel near the Rio Colorado November 1, and one 
along the Rio Liberia November 3. 
These birds, with wing measurements of 80.3 and 81.6 mm., belong 
with the Panamanian race, being marked by a reduction of the white 
markings on the wings. 
577075—44——-4 
