262 Notes on Guiana Birds. 



accepted birds from British Guiana as typical, and named 

 the French Guiana form T. oyapocensis. 



Beilepsch, arguing that Cayenne was in French Guiana, 

 concluded that Ridgway had named, the wrong bird, and 

 restricting T. coraya to the French Guiana ( = Cayenne) 

 form, named the British Guiana bird T. ridgwayi. 



Reference to Daubenton^s plate, however, proves Ridgway 

 to be right, as, notwithstanding the locality " Cayenne/' the 

 French Guiana birds do not agree with Daubenton's figure ; 

 but British Guiana specimens collected at Roraima are 

 almost identical in every detail; consequently we should 

 select Roraima, British Guiana, as the type locality of 

 T. coraya (Gmel.), notwithstanding the locality being given 

 as Cayenne. 



The series from Roraima would therefore be known as 



Thryothorus coraya coraya. 



A series of examples from Bartica Grove, British Guiana, 

 however, differ from T. coraya coraya in the deeper chestnut 

 colour of the back and the darker and duller fulvous on the 

 chest and abdomen. This form we propose to name 



Thryothorus coraya berlepschi, subsp. n. 



The French Guiana birds must be called 



Thryothorus oyapocensis oyapocensis. 



We consider this form to be specifically distinct from 

 T, coraya. Subspecies of this race, however, are existent, as 

 a series from Ituribisci differ from T. oyapocensis oyapo- 

 censis in the darker coloration of the head, deeper chestnut 

 of the back, and the more tawny colour of the abdomen. We 

 propose, therefore, to separate this form under the name of 



Thryothorus oyapocensis ituribisciensis , subsp. n. 



We may remark also that we have examined a good series, 

 both male and female, of the Bush-Shrike from British Guiana, 

 which has been erroneously called Thamnophilus major by 

 many authors, but we find it to be identical with T. borbce, 

 Pelzein. 



