CHERRIE: ORNITHOLOGY OF THE ORINOCO REGION. I55 
/'. Under parts nol buffy brownish. 
g. Crown and nape grey in sharp contrast with oFive green 
back Pachysyhia muscicapina 
muscicapina. 
g'. Crown and nape not grey in sharp contrast with color of back . 
h. Under tail-coverts greyish white, uniform with centre of 
abdomen ^ Pachysylvia thoracicus semi- 
h'. Undei 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 ;o mm. 
in length. 
c. Throat and fore neck orange-yellow, rest of under parts washed with 
green Vireolanius Uucotis chloro- 
c'. Throat and breast lemon or greenish yellow, rest of under parts white 
or pale bufly white Cyclarhis gujanensis flavi- 
\'iREOSYLV.\ CALiDRis c.ALiDRis (Linnacus). 
[Motacilla] calidris Linnaeus, Syst. Nat., ed. lo. 1758, p. 184 (Ja- 
maica). 
In the American Museum .collection is a specimen collected at 
Boca de Sina. Rio Cunucununia, Upper Orinoco, by Miller and Iglseder. 
This species has not previously been recorded from the Orinoco. 
\'iREOsvLV.\ ciiivi .ACiLis ( Lichtensteiu ) . 
Sylvia cliivi Vieill. Nov. Diet. d'Hist. Xat. XI. 1817. p. 174. 
Laniiis agilis Lichtenstein, \'erz. Dpubl. 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.^ 
'This is entirely at variance with Mr. Hellmayr's conclusions, based on the series in the Tring Museum. 
N'ovit. Zool. XIII. 1906. p. II. 
