CHLOROSTILBON.—THALURANIA. 265 
In the neighbourhood of Jalapa it is found, according to de Oca, in greatest abund- 
ance in the months of June and July, at which time it builds its nest °. 
B. Rostrum omnino nigrum ; rectrices uniformes. 
4. Chlorostilbon assimilis. 
Chlorostilbon assimilis, Lawr. Ann. Lyc. N. Y. vii. p. 2927; ix. p. 128 (?)?; Gould, Intr. Troch. 
p. 178°; Salv. Cat. Birds Brit. Mus. xvi. p. 54°. 
Chlorolampis assimilis, Scl. & Salv. P. Z.S. 1864, p. 365°; Salv. P. Z. 8. 1867, p. 156°; 1870, 
p. 2117. 
Similis preecedentibus, sed capite summo dorso concolore haud micanti-viridi, cauda paulo furcata et rectricibus 
omnibus unicoloribus nullis griseo terminatis, et rostro omnino nigro distinguendus. 
@ quoque rostro nigro dignoscenda. (Descr. maris et femine ex Paraiso, Panama. Mus. nostr.) 
Hab. Panama, Volcan de Chiriqui’, Chitra 7, Castillo’, Cordillera del Chucu, Santiago 
de Veraguas °, Santa Fé°, Calovevora, Calobre, Line of Railway (Arcé), Paraiso 
Station (Hughes +), Lion Hill (1/‘\Leannan }°). 
This species is closely allied to C. melanorhynchus and C. pumilus, having like them 
a black bill and a forked tail, the lateral rectrices of which are rather narrow. It is, 
however, the only one of the three which has the crown of a comparatively dull green 
like the back, the crown in both the other species being of a more or less glittering 
hue. 
C. assimilis was first described by Mr. Lawrence from specimens sent him by 
M‘Leannan from the Isthmus of Panama!. It is there a common bird, and also 
throughout the whole State of Panama, at least as far as the frontier of Costa Rica. 
We have no evidence before us that it is found in the latter State, but Mr. Lawrence 
includes it in his list of the birds of that country 2. Nor have we any evidence that it 
occurs on the mainland of South America. In the State of Antioquia the bright- 
headed allied form C. pumilus takes its place, and this, too, is the prevalent bird in 
Western Ecuador, 
a". Spatio inter mandibule ramos plumis vestita. 
ce". Rostrum debile, maxille tomia ad apicem incurva: seaus dissimiles, 
ct. Cauda furcata, pileus anticus nitide violaceus, rectrices laterales haud albo notate. 
THALURANIA. 
Thalurania, Gould, P. Z. 8. 1848, p. 13; Salv. Cat. Birds Brit. Mus. xvi. p. 76. 
Two only of the fourteen recognized species of Thalurania are found within our 
limits, one of them, 7. colombica, being a common bird in the northern part of South 
America and reaching Nicaragua in our country; the other, 7. townsendi, has as yet 
BIOL. CENTR.-AMER., Aves, Vol. II., May 1892. 34 
