33 FIELD MUSEUM OF NATURAL HISTORY ORNITHOLOGY, VOL. I. 



(No. 90160), originally in the collection of Dr. P. L. Sclater, and taken 

 in British Guiana by Mr. E. F. im Thurm, agrees very well with the 

 above descriptions in size and pale coloration of the under parts and 

 appears to represent typical C. s. isabellina Swainson. It is very likely 

 that the specimen in question came from the high savanas of the interior, 

 probably in the vicinity of Roraima.* 



Two specimens from eastern Venezuela, one from Maripa, Caura 

 River, and the other from San Antonio, Burmudez, are puzzling and 

 cannot be readily referred to any described form. Both have the breast 

 decidedly more deeply colored than in distincta or isabellina, and paler 

 than in ochracea or perplexa, approaching margaritensis in the coloration 

 of the under parts; but the paler gray crown is nearer distincta. 



The San Antonio bird (wing, 177; tail, 126) has a wide tail band, 

 approaching that of ochracea, but in the male from Maripa, the black 

 tail band is much narrower. It is not unlikely that they may prove 

 to be intergrades between ochracea and isabellina, but more specimens 

 from these localities are needed to determine their relationship. 



Cerchneis sparveria distincta Cory. 



Cerchneis sparverius distincta Cory, Field Mus. Nat. Hist. Pdb., 

 Ornith. Series, I, No. 8, 1915, p. 297. 



Type locality: Boa Vista, Rio Branco, Amazonas, northern Brazil. 



Range: Rio Branco region, Amazonas, northern Brazil (limits 

 of range unknown). 



Characters: Back ochraceous cinnamon rufous; crown ashy gray 

 and without noticeable dark shaft streaks; chest washed with pale 

 rufous cinnamon (approaching ochraceous tawny, with a tinge of rufous, 

 and palest of the races except isabellina) , becoming whitish on the ab- 

 domen and buffy white on the flanks and under tail coverts; under parts 

 unspotted; outer web of outer rectrix white, with occasionally narrow 

 black streaks bordering the shaft; inner web of outer rectrix largely 

 rufous, with one black subterminal band, the tip white; tips of all 

 except the outer rectrices white, in the middle bordered with more or 

 less rufous; greater portion of the inner web of the outer primaries white, 

 the dark bars or patches being much shorter and more irregular than 

 in allied forms, often (especially on the basal half of the feathers) not 

 extending beyond the middle of the web, the white areas being corre- 

 spondingly increased; outer web of second (outer) primary plain or with 

 a trace of one small white spot; outer web of third with two (rarely 

 three) small white spots or narrow streaks. 



See Salvin, Ibis, 1885, p. 196; *&., 1886, p. 76. 



