CHERRIE: ORNITHOLOGY OF THE ORINOCO REGION. 155 



/'. Under parts not buffy brownish. 



g. Crown and nape grey in sharp contrast with olive green 



back Pachysylvia muscicapina 



muscicapina. 



g'. Crown and nape not grey in sharp contrast withcolorof back. . 

 h. Under tail-coverts greyish white, uniform with centre of 



abdomen Pachysylvia thoracicus semi- 



cinerea. 

 h'. Under tail-coverts pale yellow in contrast with greyish 



white of centre of abdomen Pachysylvia brunneiceps. 



b'. Bill stout and strongly decurved terminally; wing more than 70 mm. 



in length. 

 c. Throat and fore neck orange-yellow, rest of under parts washed with 



green Vireolanius leucotis chloro- 



gaster. 

 c'. Throat and breast lemon or greenish yellow, rest of under parts white 



or pale buffy white Cyclorhis gujanensis flati* 



pectus. 



VIREOSYLVA CALIDRIS CALiDRis (Linnaeus). 



[Motacilla] calidris Linnaeus, Syst. Nat., ed. 10, 1758, p. 184 (Ja- 

 maica). 

 In the American Museum collection is a specimen collected at 



Boca de Sina, Rio Cunucunuma, Upper Orinoco, by Miller and Iglseder. 

 This species has not previously been recorded from the Orinoco. 



VIREOSYLVA CHIVI AGILIS (Lichtenstein). 



Sylvia chivi Vieill. Nov. Diet. d'Hist. Nat. XL 1817. p. 174. 

 Lanius agilis Lichtenstein, Verz. Doubl. 1823. p. 526. 

 Vireo chivi Berlepsch & Hartert, p. 13. 



Common. A nest containing young was found June 8th, and on 

 June 24 many young were seen. The nest is much like that of the 

 common V. olivacea of Eastern North America, suspended between the 

 slender twigs of a small branch, about 2.5 m. from the ground, and 

 measures : outside depth 4.5 cm. inside depth 3.5 cm. ^ outside diameter 

 about 5.5 cm., inside diameter about 4.5 cm. at the rim, which is slightly 

 contracted. The general outlines of the nest are somewhat irregular, as 

 it conforms more or less to the triangular supports from which it is 

 suspended. The nest walls are frail and composed of soft dry grasses 

 over which there is a veneer of half decayed leaves held in place by 

 spider webs; there is no inner lining. 



In my series from the Orinoco there are quite as many birds of 

 this species having the bill blackish as there are those that have the 

 bill brownish horn-color, and there is no appreciable difference in size 

 between them and birds from the island of Trinidad. 1 



'This is entirely at variance with Mr, Hellmayr's conclusions, based on the series in the Tring Museum. 

 Novit. Zool. XIII. 1906. p. ii. 



