BIRDS OF AVESTERN COLOMBIA. 1171 



No. 2336. J ad. Novita: 25.xi.08.— Wing 78; tail 51 ; bill 

 20 mm. 



Nos. 2564, 2565. J § ad. Juntas, R. Tamana : 9.iii.09.— 

 Wing 77, 76; tail 48, 49; bill 20, 19| mm. 



" Iris brown, feet bhie-grey, maxilla black, mandible grey." 



The specimens are topotypical. The female diflfers from the 

 males in having the dark grey colour of the forehead and sides of 

 occiput less extended and in lacking the blackish border to the 

 white chest. 



A. h. daguce is nearest to ^. h. bicolor, from Panama, but may 

 be easily distinguished by the much darker, deep vandyke (rufous) 

 brown instead of light russet-brown colour of the upper pai-ts, 

 much darker rufous- brown flanks, larger, stronger bill, and by 

 the presence of a distinct blackish border to the white chest in 

 the male sex. 



A. b. cequatorialis Hellm., from Western Ecuador, agrees with 

 A. b. daguce in the dark coloration of the back and flanks, but the 

 forehead and crown are bright cinnamon rufous, the sides of the 

 occiput alone being dark cinereovis, etc. 



The various races of A. bicolor not having been properly 

 undei-stood hitherto, it is hoped that the subjoined key will aid 

 ornithologists in identifying specimens of the group. A. leucaspis 

 Scl. is a near ally of A. bicolor and very likely its Amazonian 

 (eastern) representative ; it diflfers, however, in having the cheeks, 

 malar region, and anterior ear-coverts white (instead of black), and 

 in the possession of a large, concealed, pale cinnamomeous inter- 

 scapular patch in the female sex. 



Key to the species and subspecies. 



1. Cheeks, malar region, and anterior ear-coverts white. 



Female with a distinct, light cinnamomeous inter- 

 scapular blotch. I^Nasal plumes and whole pileum 

 bright ferruginous. Lores and narrow superciliary 

 stripe black] A. leucaspis. 



— Cheeks, malar region, and whole of the ear-coverts 



black. Female without a pale interscapular blotch 2. 



2. Sides of the occiput dark cinereous, abraptly con- 



trasted with colour of crown 3. 



— Sides of the occiput concolor with crown, never 



cinereous. [White chest laterally not bordered by 

 a blackish stripe] 5. 



.3. Forehead and a broad superciliary stripe dark cine- 

 reous like the sides of the occiput 4. 



— ■ Forehead and crown ferruginous, only sides of occiput 



dark cinereous A. bicolor aquatoriaVxs. 



4. Crown and back light russet-brown ; sides of body 



mars-brown; bill smaller : 17-18j mm A. licolor bicolor. 



■ — Crown and back deep vandyke or dark rufous brown ; 

 sides of body vandyke brown ; bill larger ; 

 19^-21 mm A. bicolor dagnts. 



5. Head above light russet-brown ; back umber-brown 



or very sHghtlj' tinged with rufescent ; sides of 



body light mars-brown A. bicolor olivascens. 



— Head above bright ferruginous ; back decidedly cinna- 



mon-brown ; sides of body rufescent or russet-brown A. bicolor nijiceps. 



