Islands of the Coast of Yucatan, ^c. 369 



4-125. Centurus rubriventris. 



Centurus rubriventris i^yymaus, Ridgw. Proc. U.S. Nat. 

 Mus. viii. p. 576. 



Melanerpes pijgrnaus, Ridgw. Man. N. Ara. B. p. 293. 



Cozumel I. ; Bouacca I. (September). 



Mr. Gaumer has sent us a good series of this species from 

 Cozumel Island and four specimens from Bonacca Island ; we 

 have also several from the mainland of Northern Yucatan. 

 The average size of the island birds is rather small and the 

 plumage rather dark, but the difference is very slight, and I 

 have no difficulty in selecting a Cozumel bird, with a wing, 

 as long as one from the mainland or others not to be distin- 

 guished in colour. The central tail-feathers in the island 

 birds have a little more white towards the base ; this seems to 

 be especially the case in the specimens from Bonacca Island. j 



All that can be said of this Woodpecker is that in Cozumel 

 and Bonacca Islands it has a tendency to become smaller, 

 to assume darker plumage, and to have whiter bases to the 

 rectrices. If those that bear these characters are to be 

 separated by name, others living with them in the same 

 woods with normal plumage must be called simply C. r-ubri- 

 ventris. I cannot think this a desirable plan to adopt. 



C. rubriventris, Mr. Gaumer says, is found on Bonacca 

 Island to the exclusion of C. canescens. 



-rl26. Centurus dubius. 



Picus dubius, Cabot, Journ. Bost. Soc. N. H. v. p. 91. 



Centurus dubius, Salv. Ibis, 1885, p. 192. 



Centurus aurifrons dubius, Ridgw. Proc. U.S. Nat. Mus. 

 iv. p. 108. 



Centurus leei, Ridgw. Descr. New Sp. B. Cozumel, p. 3. 



Centurus dubius leei, Ridgw. Proc. U.S. Nat. Mus. viii. 

 p. 575. 



Melanerpes leei, Ridgw. Man. N. Am. B. p. 293. 



Meco I. (November) ; Cozumel I. 



A specimen from Meco has a nearly pure Avhite rump, ' 

 with only the shafts of the longer coverts dark, and exactly 

 corresponds with mainland specimens. The Cozumel bird 



