Notes on Hiimming-Birds. 429 



P. nigricinctus and P. injcjmmis can only be treated as 

 subspecifically allied. Even in tlie British ISIuseum collec- 

 tion we find specimens of the former from Bolivia which 

 hardly, if at all, differ from one or two of the series of the 

 latter species. In fact in Bolivia the somewhat iut rmediate 

 forms seem to be the rule. Mr. Arthur Maxwell Stuart has 

 sent to the Tring Museum four specimens which he shot at 

 San Augustin, in Eastern Bolivia, at an elevation of about 

 3500 feet. In these four birds about one-third of the mandible 

 is black, Avhile in P. jjyi/'^^ieus about one-half is black, in 

 tyjncal P. ni(/iicincAus only the utmost tip. However, this 

 character is evidently varia])le, and therefore I cannot treat 

 these Bolivian skins as belonging to an intermediate species 

 or subspecies, as I do not see any other constant characters 

 to separate them by. 



One new species has nevertheless been discovered by 

 Mr. A. M. Stuart in E. Bolivia, which I described as 

 Pha'ethornis stuarti at the April meeting of the B. O. C. 

 (see below, p. 442). As it is, I shall now have to recognize 

 the following forms of the genus Pha'ethornis : — 



1. P. yuyi yuyi (Less.). Coastal lull-ranges of Venezuela, Trinidad. 



2. P. ffuiji emilice (Bourc. & Muls.). Andes, from Costa Rica to Peru. 



3. P. yaruqui (Bourc). Ecuador. 



4. P. superciliosus superciliosus (L.). Cayenne. 



5. P. superciliosus guianensis (Boucard). British Guiana. 



6. P. s2(perciIiosus moorei (Lawr.). Eastern slopes of Andes in Colombia 



and Ecuador. 



7. P. baroni, Hartert. West Ecuador. 



8. P. lonyirosti'is, Delattre. Central America to North Colombia. 



9. P. mexicanus, Hartert. Mexico. 



10. P. bolivianus, Gould. Bolivia. 



11. P. hisjjidus (Gould). Upper Amazons. 



12. P. synnatopihonis, Goiild. Ecuador and Cauca Valley. 



13. P. berlepschi, Hartert. W. Ecuador. 



14. P. antJtophilus (Bourc. & Muls.). Colombia and Venezuela. 



15. P. eurynome (Less.). Southern Brazil. 

 10. P.squiilidusQ)iQmm.). S.E. BraziL 



17. P. younellei, Bouc. Brazil. 



18. P. augusti (Bourc). Colombia to Guiana. 



19. P. 2)retrii (Less. & Delattre). Brazil. 



20. P. hourcieri (Loss.). Guiana to the Andes. 



