6 



Heine, in their elaborate review of the Jacamars in the ' Museum Heineanum'*, I was for some 

 time disposed to concur. But when Mr. Salvin and I came to examine into the question again 

 in working up Mr. Wallace's collection from the Lower Amazons and Eio Negro (P. Z. S. 1867, 

 p. 581) we arrived at the conclusion that it was necessary to resuscitate the species. We remarked 

 that this form Avas certainly distinguishable " by its much larger size, by the hoary terminations 

 of the head-feathers, by the less amount of black on the chin, and by the greater extent of white 

 on the throat below." To this opinion we likewise adhered in our ' Nomenclator,' although we 

 were still then under the impression that this species was from Lower Amazonia. This, however, 

 I now believe to be an error. In the collection of Salvin and Godman there is a skin of this 

 Jacamar from Ega, on the Upper Amazons, procured by Mr. Bates; and I have little* doubt that 

 Upper Amazonia is the true patria of Urogalba amazonum. The replacement of Guianan species 

 by larger and finer forms in Upper Amazonia is by no means an unusual phenomenon ; and this 

 appears to be an additional instance of its occurrence. 



Having already pointed out the chief differences which distinguish this species from the 

 nearly allied U. paradisea, I think it unnecessary to describe it at full length. I should, however, 

 mention that in Mr. Bates's specimen (No. 1} the iris is marked " dark brown." 



The following are the dimensions of the specimens before me : — 



fo. 



Mus. 



Patria. 



Long tota, 



alee, 



caudas, 



rostri a rictu. 



1. 



P.L. S. 



Upp. Amaz. 



130 



3-8 



6-3 



2-7 



2. 



S.-G. 



Ega. 



no 



3-4 



5-7 



2-2 



The second bird is probably a female. The example figured (No. 1) is the type upon which 

 the species was originally based. 



* Mus. Hein. pars iv. sect. i. p. 217. 



