56 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95 
whistle of varied tone, an erratic scale that is easily mimicked. They 
replied to my imitation time after time, and occasionally flew up 
from the ground to cling for an instant to some low branch, offering 
the only opportunity for a shot. In the obscure light of their jungle 
haunt, they appeared uniformly dark in color, so that in the hand 
it was a pleasant surprise to see the variegated pattern of the plumage 
and the brilliant blue of the bare skin of the side of the head. This 
was one of the strangest of the interesting inhabitants of this grand 
forest. 
HYLOPHYLAX NAEVIOIDES CAPNITIS (Bangs) 
Hypocnemis naevioides capnitis Banas, Proc. Biol. Soc. Washington, vol. 19, 
July 30, 1906, p. 107 (Volc4n Miravalles, Costa Rica). 
On the slopes of Volcin Rincén de la Vieja this was one of the 
commonest of the birds that gathered over the moving ant armies 
in the forests. It was found from Los Cuadros to the summit of 
Cerro Santa Maria, usually in little parties. On my first encounter 
the chattering, insistent note with which this antbird greets intruders 
was a mystery for several minutes, as it was difficult to decide whether 
it came from the tree tops or from the undergrowth, until finally I 
caught sight of the bird near the ground. Ordinarily they worked 
along a foot or so above the ant columns, moving actively and utter- 
ing their chattering calls. Specimens were secured on November 5, 
8, 9, and 11. 
MYRMOTHERULA SCHISTICOLOR SCHISTICOLOR (Lawrence) 
Formicivora schisticolor LAWRENCE, Ann. Lyc. Nat. Hist. New York, vol. 8, 1865, 
p. 173 (Turrialba, Costa Rica). 
The only one of these antbirds seen was shot on November 8 in 
undergrowth at the edge of an old clearing at Los Cuadros on the 
Hacienda Santa Maria. 
DYSITHAMNUS MENTALIS SEPTENTRIONALIS Ridgway 
Dysithamnus mentalis septenirionalis RIDGWAY, Proc. Biol. Soc. Washington, vol. 
21, Oct. 20, 1908, p. 193 (Choctum, Vera Paz, Guatemala). 
In the heavy forest on the Hacienda Santa Maria these small birds 
were fairly common. In spite of their stocky little bodies they are 
active in movement through the undergrowth and the lower tree tops. 
They formed a regular part of the little groups of forest birds that 
moved in scattered parties in company through the trees, like migrant 
warblers in fall in the North. Though active they were often shy. 
On November 5 I encountered several groups on the high shoulder of 
the mountain back of the hacienda in the section known as Papal and 
