Races of the Guiana Flycatcher. 307 
REMARKS.—This rather well differentiated subspecies is apparently 
the representative of the Myiarchus ferox group in Ecuador and Peru, 
but its limits of distribution are at present undefined. It is of interest 
to note, however, that in color it much more closely resembles the Costa 
Rican Myiarchus ferox actiosus than it does the intervening Myiarchus 
ferox panamensis. 
MYIARCHUS FEROX FEROCIOR Cabanis. 
Myiarchus ferocior CABANIS, Journ. f. Ornith., vol. XXXI, No. 162, 
April, 1883, p. 214 (Tucuman, Argentina). 
Subspecific characters.—Similar in size to Myiarchus ferox ferox, but 
upper parts lighter and more brownish (less greenish) olive; gray of 
throat lighter. 
Measurements.—Male: wing, 90 mm.; tail, 89; exposed culmen, 19. 
Female: wing, 85 mm.; tail, 86; exposed culmen, 16.5. 
Type locality—Tucuman, northern Argentina. 
Geographic distribution—Northern Argentina and Paraguay, with 
probably also Bolivia and southwestern Brazil. 
REMARKS.—This seems to be a recognizable race, differing from both 
Myiarchus ferox ferox of Guiana and Myiarchus ferox swainsoni of 
southeastern Brazil. No specimens have been examined from south- 
western Brazil or from Bolivia, but in all probability this is the form 
of the species that occupies those areas. Further investigation, how- 
ever, must settle this point. 
MYIARCHUS FEROX SWAINSONI Cabanis and Heine. 
M[yiarchus]. Swainsoni CABANIS and HEINE, Mus. Hein., part 2, 
September 30, 1859, p. 72 (Brazil). 
Myiarchus cantans PELZELN, Ornith. Bras., 1869, pp. 117, 182. (Rio 
Janeiro, Sapitiba, Ypanema, and Curytiba, Brazil) (type locality, Cury- 
tiba, State of Sao Paolo, Brazil). 
Subspecific characters.—Similar to Myiarchus ferox ferocior, but bill 
shorter, upper parts paler, somewhat more grayish, and more uniform, 
the pileum and auriculars not noticeably darker than the surrounding 
parts, as is the case in Myiarchus ferox ferocior. 
DESCRIPTION.—Adult male, No. 177677, U.S.N.M.; San Carlos do 
Pinhal, September, 1895. Upper parts dark citrine drab, the darker 
centers of the crown feathers dull olive brown, and the upper tail-coverts 
slightly rufescent; tail warm fuscous, the outer webs of the outer pair 
of tail-feathers and the very narrow tips of all, pale brown; all but 
the exterior pair of rectrices basally edged with rufescent brown; wing's 
fuscous, the tertials edged on the ovter webs with buffy white, the pri- 
