(23 ) 



These birds are practically identical with a very large series of skins from 

 Bahia and Ceara. Two adult (?<? obtained by Natterer near the city of Goiaz 

 and on the Rio Parana; an adnlt bird collected by Castelnan and Deville at 

 Porto Imperial, on the Rio Tocantins ; seven specimens (of both sexes) from 

 Chapada, Mattogrosso, taken by H. H. Smith ; and two examples secured by 

 U'Orbigny in the plains of Chiquitos, Eastern Bolivia, agree likewise in every 

 jiarticnlar with typical C. cearcnsis. All these specimens have a very distinct 

 plumbeous spot at the base of the lower mandible, even young birds, in fluffy 

 plumage and with pointed tail-feathers. 



Dr. Allen * referred the Mattogrosso specimens to C. liridis (type ex Paragnay) 

 to which he also unites C. wiedii Pelz. with uniform reddish brown bill. While 

 admitting that there are scarcely any constant colour-differences between true 

 C. tiridis (of Paragnay, Western Argentina, and High Bolivia) and the form inhabiting 

 the campos of Brazil and the plains of Eastern Bolivia, I find that the latter are 

 constantly much smaller, and have a much weaker, slenderer bill. As a rule the 

 back is brighter, more yellowish green, and the yellow on the foreneck clearer 

 and somewhat more extended. Measurements of a large number of skins of both 

 forms are given below. 



From C. g. gujanensis,\ of Amazonia and Guiana, C. g. cearensis differs by 

 having the belly creamy-white or buff (without any greyish " cast ") ; the foreneck 

 and sides of the chest of a purer and clearer yellow (not tinged with greenish), 

 the cap always more or less washed with brownish ; and by its stouter, higher 

 bill with the plumbeous area of the lower mandible less extended. 



Cf. also Berlepsch, Ibis, 1888. p. 87. 



Specimens from Maranhao, N.E. Brazil, are intermediate between C. g. gujanensis 

 and C. g. cearensis. Having seen but two skins, I cannot say to which of the two 

 forms they are more nearly related. 



[C. iviedii Pelz., considered by Dr. Allen to be the "young of the year" 

 of his C. tiridis {^cearensis), is evidently specifically distinct and more nearly 

 allied to C. ochrocepkala, of which it is the northern form. I hope to discuss 

 this intricate question on another occasion.] 



The range of C. g. cearensis and C. g. viridis is, according to my knowledge, 

 as follows : 



a. C. gujanensis cearensis (Baird). 



Cijclorhis cearmsis Baird, Rev. Amcr. Birrh i. p. 391 (18i)6. — Ceari). 



C. alhiventris, Sclater & Salvin, Nomencl. Av. Neotrop. p. 15&(1873. — Bahia). 



Thamnophilus guianen.vs (nee GmeliD) Wied, Beitr. Nahmj. Bras. .3. ii. 1831. p. 1016 (Campo Geral). 



Laniagra guyanemis Lafrcsnaye et D'Orbigny, Syn. Av. i. in Mug. Zool. 1837. cl. ii. p. 9 {part. : 



Bolivia). 

 Cyclorhis tpiedii (nee Pelzeln) Pelzeln. Zur Orti. Bras. ii. 1868. pp. 74, 137 (part. : Bahia, Goiaz, 



Rio Parana). 

 Cyclorhis viridis (nee Vieillot) Allen, Bull. A m. Mus. A', ft. ii. 1889. pp. 123—127 (part. : •' adult bird 



in breeding season " — Chapada, Mattogrosso) ; Salvadoii, Boll. Mus. Tm-iun, xv. No. 378, 1900. 



p. 3 (CorumbA). 



Hab. East Brazil : Ceard (fide Baird ; two specimens in Mus. H. v. Berlepsch), 

 Bahia (many specimens in Mus. H. v. Berlepsch, Triug, Munich, Vienna). Central 

 Brazil: Goiaz (Natterer), Rio Thesouras, R. Araguaya (Baer); Porto Imperial) 



• Bull. Amer. Mus. N. H. ii. 1889. pp. 123—135. 



t Examined : 6 Brit. Guiana ; 3 Cayenne ; 1 Surinam ; 4 Kio Branco ; 3 Par4 ; 2 Rio Madeiia '> 

 1 Tarapoto, N. ?eru ; 1 Samiria, N. Peru. 



