62 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 134 
alarmed they came into open branches where the males postured, 
called, and drove at one another in harmless threats of combat. In 
these displays the full skin of the back of the neck is distended by an 
air sac that fills the space between the shoulders and the base of the 
skull, so that this region appears greatly enlarged. The musical note 
to-le-do, which gives them their common name, somewhat shortened 
in utterance, is easily imitated, and often serves to decoy the birds 
into view. They are known also as soldado. The series collected is 
similar in size and color to birds of the mainland. 
Family TyRANNIDAE: Tyrant Flycatchers 
MUSCIVORA TYRANNUS MONACHUS (Hartlaub): Fork-tailed Flycatcher, 
Tijereta Sabanera 
Tyrannus (Milvulus) monachus Hartiaus, Rev. Zool., vol. 7, June 1844, p. 214. 
(Guatemala. ) 
One seen at the San Juan work camp is attributed to subspecies 
on the basis of probability. The record has definite significance, as 
the casual presence of this flycatcher on an island so far from the 
mainland is indicative of some migratory movement, a matter that 
has been questioned. The species must be regarded as of irregular 
occurrence, since it is only in recent years that clearings have made 
a suitable habitat for it on Coiba. 
They are called Tijereta de Palo also. Country people usually 
shorten the name to Tijereta, though it must be added that this same 
name is sometimes used for the frigate-bird. When there may be 
confusion the latter is called Tijereta del Mar. Golondrina is another 
country name often wrongly applied to this flycatcher. 
TYRANNUS MELANCHOLICUS CHLORONOTUS Berlepsch: Tropical 
Kingbird, Pechi-amarillo Grande 
Tyrannus chloronotus BERLEPSCH, Ornis, vol. 14, 1907, p. 474. (Temax, Yuca- 
tan.) 
The tropical kingbird was found commonly on dead limbs and 
other perches in the lower brush, among the growths bordering the 
beaches, resting always when it had a clear view from which to 
watch for the insects that form an important part of its food. The 
extensive pastures back of the convict camps were favorite haunts, 
and it is one of the two species of birds seen regularly in this com- 
paratively new open habitat. Undoubtedly it is more abundant, now 
that such areas have been opened, than it was formerly when the 
