184 Proceedings of the Biological Society of Washington. 



throat more or less shaded with olivaceous, in contrast with the rest of the 

 under surface. 



Measurements.— Male: wing, 58-65 (62); tail, 45-50 (47); bill, 9.5-11.5 

 (10); tarsus. 13.5-16 (14.7). Female: wing, 56-59 (57.5); tail, 42-47 

 (44); bill, 10-11 (10.5); tarsus, 13-15.5 (14.5). 



Range. — Northern Brazil ("Amazonia") to Guiana and Venezuela 

 (south of the Orinoco), west to the Andes, and south into central Bolivia. 



Remarks. — This form is to be distinguished by its rich, deep coloration 

 below, in which respect it often goes beyond true oleaginea, the abdomen 

 being rich yellow ocher, but the throat and breast are more strongly 

 shaded with olivascent, so that the under parts are more distinctly bicolor. 

 The range of variation is considerable, however, but inasmuch as it obtains 

 in specimens from the same locality it is certainly only individual or 

 seasonal, rather than geographical. Specimens from Villavicencio, 

 Colombia (the type-locality of chapmani Chubb) are indistinguishable, so 

 far as we can see, from others from Pebas, Peru (the type-locality of 

 hauxwelli of the same author), and these are collectively not satisfactorily 

 separable from a series from VUla Braga on the Tapajoz River in Brazil, and 

 from some others coming from the Pard district. Mr. Chubb's description 

 of waUacei indicates that it too was based on a bird of this type, the wing 

 being given as only 61 mm. in length Furthermore, two specimens from 

 Dutch Guiana and one from British Guiana, as well as one from Cariaquito, 

 Venezuela, are fully as richly colored below as specimens from the Caura 

 River, all certainly referable to one and the same form. A series from 

 French Guiana, on the other hand, are somewhat paler, and might readily 

 be referred to pnllidiventris, were it not for the discontinuous distribution 

 which would be involved thereby. In short, after examining an unusually 

 fine series of specimens, and after making due allowance for such individual 

 and seasonal variation as exists, we can not see our way clear to recognizing 

 more than one form for the vast region drained by the Amazon River, and 

 extending northward into Guiana and Venezuela. For this we accept the 

 name chloronota of D'Orbigny and Lafresnaye, described from eastern 

 Bolivia, whence we have a good suite of specimens. There can be no doubt 

 of the application of this name, since the description clearly indicates a 

 bird with ochraceous wing-bars. The allocation of some of the above 

 references to the present form, however, is not so certain, since without 

 actual examination of the specimens upon which they were based it is 

 impossible to say whether they really belong here or to the form with plain 

 wings. 



Specimens examined. — Colombia: "Bogotd, " 3; Florencia, 2; VUla- 

 vicencio, 2. Venezuela: Suapure, 1; Cariaquito, 1; Rio Mocho, 1; El 

 Llagual, 2; unspecified, 1. British Guiana: Merum6 Mountains, 1. 

 Dutch Guiana: Paramaribo, 2; Lelydorp, 1. French Guiana: Cayenne, 

 3; Mana, 1; Pied Saut, 8. Peru: Pebas, 1. Bolivia: Santa Cruz de la 

 Sierra, 1; Rio Yapacani, 6; Buenavista, 1; Rio Surutu, 1; Mouth of Rio San 

 Antonio, Rio Espirito Santo, 1. Brazil: Benevides, 5; Utinga (near Pard), 

 6; Pard, 1; Santarem, 5; Diamantina (near Santarem), 1; Boim, Rio 

 Tapajoz, 1; Conceijao, Rio Uaju, 2; Arumatheua, Rio Tocantins, 2; 



