364 Bulletin American Museum of Natural History. [Vol. XXXIV, 
Remarks.— Panama specimens of this species have been referred by 
Salvin & Godman (Biol. Cent. Am. Aves, III, p. 309) and Ogilvie-Grant 
(Cat. B. M. Bds., XXII, p. 433) to the ‘Bogota’ form O. g. marmoratus. 
The fact, however, that both these authors refuse to recognize the strongly 
marked, and perhaps specifically distinct, west Panama form, Odontophorus 
castigatus Bangs, indicates that due weight was not given to the markings 
by which the races of this species may be distinguished. 
The twenty-seven specimens before me apparently show that in northern 
South America there exist at least four subspecies of Odontophorus guianensis, 
the characters of which may be summarized as follows. I find no constant 
differences in size. 
1. Odontophorus guianensis guianensis (Gmel.). Type-locality ‘‘Cayenne.”’ 
Char. subsp.— Ear-coverts buffy; chin brown or brownish, sides of the head rich 
chestnut-brown; throat grayish. 
Range.— Guianas southward to the Amazon. 
Specimens examined.— British Guiana: Potaro Landing, 3; Brazil: Santarem, 1 
(this specimen has more rufous on the throat than in the Guiana birds). 
2. O.g. marmoratus (Gould). Type-locality ‘Bogotd.’ 
Char. subsp.— Chestnut-brown markings of the head much reduced or entirely 
wanting; chin grayish or brownish; ear-coverts umber sometimes with a chestnut 
tinge. 
Range.— ‘Bogota’ region including the Tropical Zone at the eastern base of the 
Eastern Andes upward to an altitude of 4500 ft., and forested parts of the lower 
Magdalena Valley. 
Specimens examined.— Colombia: Buena Vista (above Villavicencio, 4500 ft.), 
1; La Murelia (600 ft.), Caqueta, 1; Puerto Valdivia (360 ft.), Antioquia, 2. (The 
two specimens from east of the Andes have no chestnut-brown on the head; the two 
Antioquia specimens have the ear-coverts and sides of the head tinged with chestnut- 
brown and thus more nearly conform to the description of Gould’s type which may 
have come from the western instead of the eastern side of the Eastern Andes. 
3. Odontophorus guianensis panamensis Chapm. ‘Type-locality, Panama R. R. 
Line. 
Char. subsp.— Chin white or whitish; throat with white or whitish spots or 
bars; ear-coverts cinnamon-rufous; brown markings of the head paler and less 
extended than in guianensis, more evident than in marmoratus. 
fange.— Panama (eastward to the Atrato, westward to the range of castigatus). 
Specimens examined.— Panama R. R. Line, 5; Nata Coclé, 1; Tapaliza, 55 
Tacarcuna, 4. 
4. O. 4. castigatus (Bangs). Type-locality, Divala, Chiriqui. 
Char. subsp.— Back anteriorly brownish of the same general tone as rest of the 
upperparts. 
Range.— Western Panama and southwestern Costa Rica. 
Specimens examined.— Chiriqui, 5. 
Odontophorus pachyrhynchus Tschudi, of Peru, is currently synonymized 
with 0. g. marmoratus, but in view of the racial variability of the species it 
doubtless is a valid form. I have, however, seen no specimens. 
