346 BROOKLYN INSTITUTE MUSIiUM. SCIENCE laLLETIN 3. 6. 
an adult male was taken at the same point in June and a female in 
July, and a second female (immature) was taken at Las Barrancas 
in August. In every case the crop was examined and found to be 
full of the bodies of snails from which the shells had been removed. 
Iris primrose yellow ; maxilla black, mandible greenish sulphur 
yellow with distal half of cutting edge slate color; cere parrot green; 
feet deep chrome yellow. 
Leptodon c.-\vennensis (Gmelin). 
Falco caycnncnsis Gm., Syst. Nat. I. 1788. p. 263. 
Leptodon caycnncnsis Berlepsch & Hartert, p. 114. 
Rare. A single female of this species was taken at Caicara, 
February 23, 1898, on my first expedition to the Orinoco. 
Eye gallstone yellow ; bill black ; cere deep chrome yellow ; feet deep 
chrome yellow. 
RosTRH.\Mus soci.ADiLis (VieiUot). 
Hcrpctothcn-s sociabilis Vieillot, N. Diet. d'Hist. Nat.. X\'III: 1817: 
318 ( Corrientes and Rio de la Plata). 
Rostrliamiis sociabilis Stone. Proc. Ac. Nat. Sci. Phil. IQ13: p. 195 
(Cano Corosal). 
The Everglade Kite was observed as far as Ciudad Bolivar. Stone 
records it from the delta region. 
G.-\MPS0NYX swAiNSONi Vigors. 
Gampsonyx sivainsoni Vig., Zool. Journ. II. 1825. p. 69; Berlepsch & 
Hartert, p. 114. 
Native name Gavilan primiio. Not uncommon. 
This and the succeeding species live in the thinly wooded savanna 
regions of the middle Orinoco and were not observed beyond the falls 
of Atures. Specimens were collected at Agua de Salada, Ciudad 
Bolivar, Altagracia, Caicara and Quiribana de Caicara. They feed 
chiefly on insects, such as locusts, small lizards, etc., but parts of 
small birds were found in the stomach of two of those examined. 
Eye chestnut; bill black; cere (very inconspicuous) blackish; feet 
chrome yellow, claws black. 
A nest containing two downy young and one egg (pipped) 
together with the female parent was collected at Agua Salada de 
