154 



Colombia, where the very distinct M. jJallescens seems to take its place. North of Panama we 

 enter the area of the closely allied form 31. grandior. 



Comparing together a series of this species and M. morplieus, we at once notice that the 

 extent of white on the throat, though slightly variable in amount, is always much smaller in 

 the present bird, only occupying just the summit of the chin under the rami of the lower 

 mandible. The white front is also rather narrower, and the size, as will be seen by the admea- 

 surements, rather smaller. 



The Peruvian White-faced Nunbird is represented by the following series in my collection 

 and that of Messrs. Salvin and Godman : — 



ISo. Sex. 



i. — 



2. — 



3. — 



4. — 



5. — 



6. — 



7. — S.-G. Sarayacu, Ecuador (5mc^%). 9-0 4-8 4-5 1-4 



The figure (Plate LI.) is taken from No. 3. 



Mus. 



Patria. 



Long tota, 



alse, 



caudae, 



rostri 



P.L. S. 



Upper Amazons. 



10-8 



4-9 



4-4 



1-5 



S.-G. 



Ega, Upper Amazons. 



9-8 



4-6 



4-4 



1-2 



P. L. S. 



ChamicuroSj Peru [Bartlett) . 



10-2 



4-8 



4-5 



1-5 



P. L. S. 



Chamicuros^ Peru {Bartlett). 



10-3 



4-8 



4-5 



1-5 



P.L. S. 



Sarayacuj Ecuador [Buckley). 



8-8 



4-7 



4-3 



1-3 



S.-G. 



Sarayacu, Ecuador [Buckley). 



9-0 



4-9 



4-5 



1-5 



