PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 405 
46. Thamnophilus melanocrissus Scl. 
Rather common. Found in a portion of forest which had been burned 
through by Mr. Lange for the purpose of clearing. Here 7. melano- 
crissus was feasting on the various insects which had been scorched by 
the fire and were lying ready cooked upon the ground. Did not hear its 
note. 
Two specimens. Iris red. 
47. Thamnophilus doliatus (Linn.). 
Abundant. Iris white. One specimen. 
48. Formicivora boucardi Scl. 
This diminutive ant-thrush seems to be truly gregarious, and is 
usually seen in flocks of ten or a dozen. In marked contrast to all the 
others of its family which I have been able to observe in their natural 
state these birds seem to keep in the trees at a considerable distance 
from the ground, while the Formicartide in general are almost never 
seen at any considerable distance from mother earth. Only one speci- 
men secured. 
49. Rhamphocenus rufiventris Bp. 
Not common. One specimen killed in dense forest near a running 
stream. 
*50. Cercomacra tyrannina Scl. 
Apparently rare. One specimen. 
*51. Myrmeciza immaculata Scl. 
Common. Lives almost entirely on the ground in the dense forest. 
Rather shy and silent. 
*52. Formicarius hoffmani (Cab.). 
Rather common. Exceedingly shy. I have frequently watched with 
astonishment the curious maneuvers of this bird when suddenly ap- 
proached. - Instead of at once resorting to flight like most birds, it 
spreads its wings, lowers its head, and sneaks silently and quickly along, 
taking advantage of every inequality of the ground and bunch of dried 
leaves, until at a safe distance from the intruder, when it takes flight. 
There is something inexpressibly cunning and knowing in the whole 
pose and action of the bird on such occasions that is quite laughable. 
The note is a loud, clear whistle, followed at a considerable interval 
by two or more lower and less accentuated ones, and has a very re- 
markable en ee So py noneed is this latter eau aliy. 
Btead of deep pelusous or fal¥ ous. T Be dacs bars on the aves parts are likewise 
much more distinct, as well as closer together, and the size considerably less. The 
measurements, however, are not smaller than those of a specimen from Panama, which, 
nevertheless, agrees strictly in coloration with examples from Costa Rica, Veragua, 
and Nicaragua. 
It being probable that the South American bird is the true Thamnophilus lineatus of 
Vieillot, I propose to separate the Central American form as C, lineatus fasciatus.—R. R. 
