304 Proceedings of Indiana Academy of Science. 
A SYNOPSIS OF THE RACES OF THE GUIANA FLYCATCHER, 
MYIARCHUS FEROX (GMELIN). 
HARRY C. OBERHOLSER, The U.S. National Museum. 
The present status of the forms of Myiarchus ferox (Gmelin) seems 
not to be wholly satisfactory. The following notes are offered as an 
attempt to aid in their elucidation, and also to call attention to the 
need of more definite information regarding the various subspecies, 
particularly their geographic distribttion. 
For the use of material the writer is indebted to the authorities of 
the United States National Museum, the American Museum of Natural 
History, and the Carnegie Museum at Pittsburgh, Pennsylvania. 
The geographic distribution of Myiarchus ferox as a species extends 
from Costa Rica and the Island of Tobago south through the continent 
of South America to northern Argentina. At present four subspecies 
are current: Myiarchus ferox ferox, Myiarchus ferox venezuelensis, 
Myiarchus ferox panamensis, and Myiarchus ferox actiosus. An addi- 
tional race, Myiarchus ferox insulicola, has been recently described by 
Messrs. Hellmayr and von Seilern; and two others, Myiarchus ferox 
cantans and Myiarchus ferox phaeocephalus, have been recognized. In 
addition to these we find it necessary to add another, Myiarchus ferox 
ferocior Cabanis, making now a total of eight subspecies. The bird 
known as Myiarchus cephalotes Taezanowski, which some authors sup- 
pose to be a subspecies of Myiarchus ferox, is without much doubt a 
distinct species. - _ 
MYIARCHUS FEROX FEROX (Gmelin). 
[Muscicapa] ferox GMELIN, Syst. Nat., vol. I, part 2, 1789, p. 934 
(Cayenne; based primarily on Tyrannus cayanensis Brisson, Ornith., 
vol. II, 1760, p. 398). 
Subspecific characters.—Size moderate; upper parts dark and oliva- 
ceous; gray of throat and yellow of posterior lower parts also of a 
rather deep shade. 
Measurements.—Male: wing, 85.5-88 mm.; tail, 86-89; exposed cul- 
men, 19. 
Female: wing, 82.5-86 mm.; tail, 83-88; exposed culmen, 18-19. 
Type locality.—Cayenne. 
Geographic distribution—French Guiana, British Guiana, Trinidad, 
