CHLOEOSTILBON.— THALIJEANIA. 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 ^. 



(3. Rostrum omnino nigrum ; reetrices uniformes. 

 4. Chlorostilbon assimilis. 



Chlorostilbon assimilis, Lawr. Ann. Lye. N. Y. vii. p. 292'; ix. p. 128 (?) ' ; Gould, Intr. Troch. 



p. 178'; Salv. Cat. Birds Brit. Mus. xvi. p. 54 \ 

 CMorolampis assimilis, Scl. & Salv. P. Z. S. 1864, p. 365=; Salv. P. Z. S. 1867, p. 156'; 1870, 



p. 211 '. 



Similis prsecedentibus, sed capite summo dorso concolore baud micanti-viridi, cauda paulo furcataet rectricibus 



omnibus unicoloribus nuUis griseo terminatis, efc rostro omnino nigro distinguendus. 

 5 quoque rostro nigro dignoscenda. (Descr. maris et feminse ex Paraiso, Panama. Mus. nostr.) 



Hah. Panama, Volcan de Chiriqui 7, Chitra 7, Castillo \ Cordillera del Chucu, Santiago 

 de Veraguas ^, Santa Fe ^, Calovevora, Calobre, Line of Kailway (ArcS), Paraiso 

 Station {Hughes 4), Lion Hill {M'Leannan ^ ^). 



This species is closely allied to C. melanorhynchus and C. pumilus, having like them 

 a black bill and a forked tail, the lateral reetrices 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 Eica. 

 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. 



d". Spatio inter mandibulce ramos plumis vestita. 



c'". nostrum dehile, maocilloe tomia ad apicem incurva : sexus dissimiles. 



c^. Cauda furcata, pileus anticus nitide violaceus, reetrices laterales haud alio notatce. 



THALUKANIA. 

 Thalurania, Gould, P. Z. S. 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, T. colombica, being a common bird in the northern part of South 

 America and reaching Nicaragua in our country ; the other, T. townsendi, has as yet 



BIOL. CENTR.-AMEK., Aves, Vol. II., May 1892. 34 



