17. CERCOMACRA. 263 



et 1870, p. 195 (Veragua) ; Scl. et Salv. Nomencl. p. 73 ; Buuc. 

 P. Z. S. 1878, p. 01 (Coita li.ica) ; Sd. Ibis, 1883, p. "do. 

 EhaniplioccBmis ciuereivrintris, Sd. et Salv. P. Z. S. 1879, p. 525 

 (AiUioquia). 



Similar to 11. cinereiveniris, but throat slightly striated aud belly 

 darker. 



Ifab. Veragua and Colombia. 



a. Ad. sk. Veragua (Arc^). Scliter Coll. 



6,0. c? $ad. sk. Veragua {Arce). Salvin-Godman Coll. 



d. Ad. sk. Antioquia, U. S. C. {Salmon). Sclater Coll. 



6. Rhamphocaenus coUaris. 



Rhamphocfenus collaris, Pelz. Oni. Bras. pp. 84, 157 ; Sd. Ibis, 



1883, p. 96, pi. iii. 

 Microbates torquatus, Sd. et Salv. Nomend. pp. 72, 161. 



Above niiiform mouse-bro-vrn ; sides of head blackish, narrow 

 superciliaries and cheeks white : beneath white ; pectoral collar 

 black ; flanks and crissum dusky : whole length L5"5 inches, wing 2, 

 tail 1. 



Hah. Cayenne and district of Rio Negro. 



a. 2 ad.sk. Gyapoc, Cayenne (Je/s7i./). Sclater Coll. 



(Type of Microbates torrjuafus.) 



17. CERCOMACRA. 



Type. 

 Cercomacra, Sd. P. Z. S. 1858, p. 244 C. cseruleiceus. 



This group leads off from Formicivora towards PyrigJena, and is 

 a stronger and larger form of the former genus, with short wings 

 and elongated tail, composed usually of only ten much graduated 

 rectrices, and with the bill much wider and more flattened than in 

 Pyriglena. The uropygial plumes are much thickened. 



Cercomacra is distributed over the Neotropical Kegion from 

 Southern Mexico down to S.E. Brazil and Bolivia. 



Key to the Species. 



A. General colour cinereous. 



a. Tips of tail-feathers white. 



a'. Wing-coverts margined with white. 



j ^Miite ends of tail-feathers narrow . 1. ccerulescens, p. 264. 



I White ends of tail-feathers broad . . 2. cinerascens, p. 264. 

 v. Wing-coverts not margined witli wliite. 3. napensis, p. 205. 



b. Without white tips to tail-feathers. 



1 Lighter on the belly 4. tyrannina, p. 265. 



I Darker on the belly 5. nppro.vimans, p. 2 16. 



B. General colour black. 



c. Tips of tail-feathers white. 



c . Above dark ashy black : beneath black. 



( Bill broader ; tail shorter 6. niyricans, p. 267. 



) Bill narrower ; tail longer 7. carbonaria, p. 2(57. 



