was first described by Dr. Sclater in the "Ibis" for 1864 (I.e.), from specimens sent by 
Dr. von Frantzius from Costa Rica to the Smithsonian Institution, whence they were 
forwarded to England by Professor Baird. There is but one other species of Tetragonops, viz., 
T. ramphastinus, from which the present bird may be easily distinguished by its olivaceous 
colouring. 
Dr. Sclater in his original description {I.e.) remarks as follows: — 
" In general characters it is not so strongly marked, and is to some extent interme- 
" diate between Capita and TetragonojJS^ although certainly to be placed in the latter genus. 
" The bill is relatively as short as in T. ramphastinus, the keel between the nostrils is much 
" elevated and brought to a sharper edge than in the latter, but outside the nostrils is 
' ' bevilled olf at once, instead of being extended into a broad flattened surface. The curious 
" bifurcation of the lower mandible exists also in the new species." 
Dr. von Frantzius, the discoverer of the bird, gives the following observations 
respecting it, in a letter to Professor Baird. " I have obtained the new Tetragonops at the 
" foot of Turrialba, near Birris or Cervantes. The bird is there called ' Gallinita,' because 
" its cry resembles that of a chicken. It lives socially in flocks and is said to be specially 
" abundant in June." In a later communication the same gentleman records its habitat as 
the heights of Irazii, at an elevation of from 5,000 to 6,000 feet. The localities where it 
has been met with are La Palma, Quebradhonda, and Cervantes. 
The specimens from which the plate is drawn were lent to us out of his collection by 
Mr. Osbert Salvin. The figures are those of an adult male and female, and were obtained 
in Costa Rica by Carmiol. 
