342 BROOKLYN INSTITUTE; MUSEUM. SciENCE BULLETIN 2. 6. 



Colors from fresh birds are (adult male taken August ii, 1898): 

 eye orange ; bare skin immediately surrounding eye chrome yellow ; 

 bill black, slate color at base of mandible; cere, lores and remaining bare 

 skin on sides of face greenish sulphur yellow ; feet yellowish olive yellow. 



AcciPiTER TiNus (Latham). 

 Falco tinus Lath., Lid. Orn. L 1790. p. 50. 



Accipiter tinus Berlepsch & Hartert, p. 114 (La Pricion, Caura River). 



Not observed on the Orinoco. Berlepsch and Hartert record an 



immature female collected by Andre at La Pricion on the Caura River. 



RuPORNis MAGNiROSTRis (Gmelin). 

 Falco magnirostris Gm., Syst. Nat. L 1788. p. 282. 

 Asturina magnirostris Berlepsch, Ibis. 1884. p. 436 (Riv. Apures). 

 Riipornis magnirostris Berlepsch & Hartert, p. 112. 



While this is the most abundant of the hawks along the middle Ori- 

 noco, I did not learn of any vernacular name other than the generic 

 term Cavilan (hawk). 



Eye deep chrome yellow ; bare skin about eye, lemon yellow ; bill 

 black, an olive slate color at base; cere orange; feet deep chrome yellow. 



A nest with set of two eggs was found at Caicara, May loth, 1907. 

 The nest was located in the top of a Chaparo tree near the border of a 

 large tract of heavy timber. It was in the extreme top of the tree about 

 6.10 m. from the ground, a bulky structure built up of coarse dry sticks 

 placed between upright forks. Across the top it measured 45.7 cm. in 

 diameter and the depth was 35.5 cm. There was only a slight hollow 

 at the centre of the top where a lining of dry leaves formed a bed for 

 the two eggs. Incubation was far advanced. One ^gg was accidentally 

 broken in getting down from the tree, the other &gg is almost oval in 

 shape and measures 37-5x43.5 mm. In color it is white, irregularly 

 blotched with pale ferruginous brownish. 



The parent birds were both seen but were wary and did . not ap- 

 proach within range. 



Parabuteo unicinctus (Temminck). 

 Falco unicinctus Temm., PI. Col. I, pi. 313, 1824 ("Bresil"). 

 Antenor unicinttis Berlepsch, Ibis 1884: p. 436 (Angostura). 



Berlepsch (/. c.) has recorded a specimen from Angostura (Ciu- 

 dad Bolivar). 



