322 Mr. 0. Salviu on the Birds of Nicaragua. 



the true T. atricoUis of Vieillot, which name must be applied 

 without doubt to the Guiana and Trinidad bird. The mottling 

 of the wing-coverts, the number of bars on the tail, and the 

 precise shade of the colouring of the central tail-feathers, as well 

 as the breadth and squareness of the rectrices themselves, are all 

 somewhat variable characters in this group, upon which it is not 

 safe to place too much reliance in seeking for specific differences. 

 So far as our large series shows, the older the male bird the 

 squarer, broader, and shorter are the rectrices, the greater the 

 number of bars on the tail, and the finer the mottling of the 

 wing-coverts. Compared with a specimen of T. atricoUis from 

 Demerara, a male from Chontales has rather fewer bars on 

 the tail, the colour of the uuderparts is rather more of a lemon 

 tinge, and the two central feathers of the tail have a bluer tint. 

 These differences are barely definite, and are not, in my opinion, 

 sufficient to justify the separation of T. tenellus as a distinct 

 species. 



Trogon caligatus, Gould. 

 Chontales {Belt). 



Trogon elegans, Gould. 



Nicaragua [Bridges). 



We have a single skin of this northern species from Virgin 

 Bay, Lake Nicaragua, which was collected by the late Mr. 

 Bridges. 



Trogon melanocephalus, Gould. 

 Chontales [Belt). 



BUCCO DYSONI, Scl. 



Chontales [Belt). 



MONASA GRANDIOR. 



Scl. & Salv. P.Z. S. 1868, p. 327. 



Chontales [Belt). 



In our original notice of this species we mentioned its probable 

 occurrence in Mosquitia. A specimen in Mr. Belt's collection 

 confirms this extension of the range of the species beyond the 

 limits of Costa Rica. 



