147 



The white marginations of the wing-coverts at once render this Nunbird distinguishable 

 from the other members of the genus. The next following species, Monacha flavirostris, comes 

 nearest to it, but may be at once recognizable by its smaller size and yellow bill. 



I conclude with a list of the examples of Monacha atra in my collection and in that of 

 Messrs. Salvin and Godman : — 



S^o. 



Sex. 



Mus. 



Patria. 



Long, tota, 



alae, 



caudse, 



rostr 



1. 



— 



P. L. S. 



Brit. Guiana {Brown) . 



10-5 



4-7 



4-7 



1-7 



2. 



6 



P. L. S. 



Maroni, Brit. Guiana {Whitely). 



10 5 



50 



4-10 



1-7 



3. 



— 



P. L. S. 



Cayenne. 



11-5 



5-2 



5-2 



1-7 



4. 



— 



S.-G. 



Oyapok, Cayenne [Verdey). 



11-4 



5-0 



4-6 



1-7 



5. 







S.-G. 



Amazons. 



11-8 



51 



5-1 



1-8 



The figure (Plate XLVIII.) is taken from No. 1. 



