144 Annals of the Carnegie Museum. 



very probable, therefore, that this erythristic phase of plumage is 

 more or less independent of age; at any rate, only one of the young 

 birds in the present series shows this condition in its extreme develop- 

 ment. 



According to the experience of the writer this hawk is a rare bird, 

 to be found only in the more open woodland and savannas where there 

 are some scattering trees. Mr. Smith's specimens were all taken at 

 Bonda. 



27. Odontriorchis palliatus (Temminck). 



Leptodon cayanensis Allen, Bull. Am. Mus. Nat. Hist., XIII, 1900, 131 

 (Masinga). 



Two specimens : Bonda and Cinto. 



On the generic distinctness of this form as compared with Chondro- 

 hierax uncinatus see Ridgway, Bulletin U. S. Geological and Geograph- 

 ical Survey of the Territories, II, No. 2, 1876, 156, where the old 

 names for the genera are used. The present species ranges westward 

 along the coast from Guiana to Costa Rica, but there appear to be only 

 a few records for Colombia. Mr. Smith sent in three specimens, one 

 of which has already been recorded by Dr. Allen, while the other two 

 (both adults) are now in the collection of the Carnegie Museum. 



28. Gampsonyx swainsoni Vigors. 



Gampsonyx swainsoni Gurney, Ibis, 1879, 331, in text (" Santa Marta "). — 

 Allen, Bull. Am. Mus. Nat. Hist., XIII, 1900, 131 (Bonda). 



Gampsonyx swainsoni leoncc Miller and Griscom, Am. Mus. Novit., No. 25, 

 1921, inserted page (" Santa Marta"; crit.). 



Seventeen specimens : Bonda, Gaira, Mamatoco, Dibulla, Fundacion, 

 and Santa Marta. 



These agree with others from Bolivia and Venezuela. In fresh 

 plumage the birds are slaty gray above, becoming browner with wear 

 and fading. Immature birds may readily be told by the obsolescent 

 rufescent barring on the upper parts. In specimens shot from May to 

 August the wings and tail are being renewed by moult. 25 



25 This was written before the appearance of Mr. Charles Chubb's recent 

 paper {Bulletin British Ornithologists' Club, XXXIX, 1918, 21-23), in which 

 he diagnoses two new forms of this species, from Nicaragua and western Peru 

 respectively. Judging from the descriptions given, taken in connection with 

 the series at present available for study, it seems questionable whether either 

 of these supposed forms can be maintained. 



