CERCOMACRA. 45 



two-thirds the length of the tarsus. The wing is rounded, the fifth, 

 sixth, and seventh primaries longest and equal and the fourth 

 about equal to the eighth. The tail is long and much graduated, 

 the outer feather on each side being about half the length of the 

 middle ones. Coloration : male and female diH'erent. 



Key to the Species. 



A. Bend of wing and margins of upper 



wing-coverts uniform with the [p. 45. 



rest of the upper surface C. cinerascens immaculata, d , 



a. Under surface ochreous brown... C. cinerascens immaculata,^ , 



B. Bend of wing and margins of upper [p. 46. 



wing-coverts white in contrast 



to the rest of the upper sur- [p. 46. 



face G. tyrannina saturatior, d, 



I. Under surface bright chestnut- [p. 46. 



rufous G. tyrannina saturatior, $, 



377. Oercomacra cinerascens immaculata. 



Thb :^eitish Guiana Ant-Ween. 



Cercomacra cinerascens (nee Scl.) Salvin, Ibis, 1885, p. 426 (Bartica 

 Grove, Camacusa) ; Sclater, Cat. B. Brit. Mus. xv. p. 264, 1890, part, 

 specimens or-d ; Brabourne & Chubb, B. S. Amer. i. p. 204, no. 2050 

 part, 1912. 



Gercomaera, cinerascens immaculata Chubb, BuU. Brit. Orn. Club, 

 xxxviii. p. 84, July 25, 1918. 



Adult male. General colour above and below blackish slate- 

 colour ; primary and secondary quills blackish, with pale grey 

 edgings to the inner webs ; tail somewhat darker than the back, 

 with indistinct wavy bars and narrow white tips to the feathers ; 

 under surface slightly paler than the back. 



Total length 147 mm., culmen 17, wing 65, tail 57, tarsus 20. 



The type, which is in the McConnell collection, was collected 

 on the Supenaam Kiver in March 1910. 



This subspecies differs from C. cinerascens cinerascens in being 

 darker (both male and female), above and below, in the absence of 

 the white dorsal patch, and the uniform upper wing-coverts. 



According to Hellmayr (Nov. Zool. xii. p. 287) C. napensis Scl. 

 is synonymic with C. cineraitens Scl. The Guiana bird therefore 

 is easily separable from the type of the latter by the characters 

 given above. 



