FEB., 1915. NEW SOUTH AMERICAN BIRDS CORY. 301 



Wing, 223; tail, 114; tarsus, 24 mm. 



The average measurements of two females are: Wing, 216; tail, no; 

 tarsus, 22 mm. 



Nyctidromus albicollis obscurus subsp. nov. 



Type from Yurimaguas, Peru. Adult male, No. 44672, Field 

 Museum of Natural History. Collected by M. P. Anderson, September 

 16, 1912. 



Differs from both N. a. albicollis and N. a. derby anus in having the 

 general coloration decidedly darker and more mixed with blackish, the 

 under wing coverts much more extensively black and less marked with 

 brown. The black on wings and tail is deeper and purer black, not 

 brownish black as in the other subspecies. 



Wing,. 153; tail, 151; tarsus, 21 mm. 



Caprimulgus hirundinaceus crissalis subsp. nov. 



Type from Rio do Peixe, near Queimadas, Bahia, Brazil. Adult 

 male, No. 47158, Field Museum of Natural History. Collected. by 

 R. H. Becker, November 28, 1913. 



Similar to C. hirundinaceus Spix from Ceara and northeastern Brazil, 

 but general plumage darker and more blackish especially on the upper 

 parts; under tail coverts distinctly banded with black. 



Wing, 115; tail, 85; culmen, 9; width of upper mandible at base, 

 6.4 mm. 



Three specimens from the Rio do Peixe compared with ten speci- 

 mens of C. h. hirundinaceus from northeastern Brazil. 



Threnetes longicauda sp. nov. 



Type from Jua, near Iguatu, Ceara, Brazil. Male, No. 47131, 

 Field Museum of Natural History. Collected by R. H. Becker, Septem- 

 ber 2, 1913. 



Crown dull grayish brown, becorning rufous brown on the occiput 

 and nape; upper parts dull grayish green, mixed with glittering green 

 when held in the light (probably clear green in adult breeding plum- 

 age?) ; feathers of the rump and upper tail coverts edged with pale 

 rufous, some of the latter with whitish tips; lores and ear coverts black; 

 chin and middle of upper throat blackish or dusky, rest of throat 

 ochraceous cinnamon buff; breast and under parts grayish buff; under 

 tail coverts tawny buff; wings purplish brown (similar to T. leucurus). 



