CIIERKIE: ORXITHOLOGV OF THE ORINOCO REGION. 347 
Ciudad Bolivar, April 7, 1907. The nest was about 4.57 m. from the 
ground at the extreme tip of a horizontal branch of a scrub oak 
(Chaparo) in a thinly wooded savanna region. It was not concealed 
by foliage either from above or from below. My first impression on 
seeing the nest was that it was a slightly overgrown nest of a mock- 
ingbird (Mimits). It is composed entirely of small dry twigs loosely 
laid together. Outside it measures 12 cm. deep by 20 cm. in diameter 
across the top. The saucer-shaped nest cavity is 5 cm. deep in the 
centre, being unusually deep for the nest of a hawk. The outer edges 
of the nest and the ground beneath it were white with excrement 
from the incubating birds. The mother bird sat very close and did 
not leave the nest until I had rapped the tree vigorously. 
The single egg which I succeeded in saving, is nearly elliptical, 
being very slightly smaller at one end than at the other. It is a 
glossless white, marked about the smaller end with large irregular 
blotches of chestnut brown. It measures 29.5 x 24.25 mm. 
The Juvenal plumage (downy young) is white below; above pale 
vinaceous cinnamon, the wings being darkest and the neck and head 
palest; there is a small dusty spot above the eye and the loral region 
is duskv blackish. 
Cerchneis sparverius is.-vbellinus (Swainson). 
Falco isabcUimis Swains., Anim. in Menag. 1838. p. 281. 
Ccrclincis sparrcriiis isabellimis Berlep^ch, Ibis. 1884. p. 437 
(.Ango.'^tura). 
Tinnunculus sparverius isahcUimts Berlepsch & Hartert, p. 114. 
Not uncommon. Observed at all points visited from Las Bar- 
rancas in the delta region up as far as the falls of Maipures. 
Eye seal brown; bill black at tip, plumbeous at base; cere orange 
yellow; feet orange yellow, claws black. 
Falco fusco-caerulescens Vieillot. 
Falco fusco-caertilescens Vieill., Nouv. Diet. XI. 1817. p. 90. 
Hypotriorcliis femoralis Berlepsch, Ibis, 1884. p. 437 (Angostura). 
Hypotr'wrchis fuscocaerulesccns Berlepsch & Hartert, p. 115. 
Xot common. Not observed beyond the mouth of the .\pure 
River. Pairs hunt together, apparently aiding one another in the 
capture of smaller birds. I have seen this species feeding on Campy- 
