154 Proceedings of the Biological Society of Washington. 
e‘, Tail less than 90 mm. long. 
e5, Rump strongly rufous. 
1. Outer tail feather only with inner web black and outer 
web rufous, rest of tail feathers black; outer secon- 
daries edged with rufous; basal part of secondaries 
washed with rufous forming a band; throat spot rufous; 
under parts not milky white 
Cranioleuca d’Orbignyit (Reichenbach). 
(La Paz, Bolivia.) 
2. At least two outer pairs of tail feathers entirely rufous; 
outer secondaries not edged with rufous and no rufous 
basal band on secondaries; throat spot rufous; under 
parts milky white 
Cranioleuca arequipae (Sclater and Salvin). 
(Arequipa, S. W. Peru.) 
f5, Rump not strongly rufous. 
f°, At least outer tail feather uniform, both webs the same 
color to the base. 
f7, Outer tail feather only uniform rufous brown, rufous 
or pale brown. 
1. Outer tail feather brown, rest of tail dark brown, 
the feathers more or less bordered with pale 
brown; a white superciliary stripe; throat whitish, 
more or less indistinctly streaked with brownish 
Cranioleuca humilis (Cabanis). 
(Junin, Peru.) 
2. Outer tail feathers dark rufous, rest of tail dark 
rufous with blackish on inner webs; throat spot 
(in adult) tawny rufous 
Cranioleuca pudibunda (Sclater). 
(Obraillo, C. Peru.) 
g7. Two outer pairs of tail feathers uniform rufous, rest 
blackish or blackish marked with rufous. 
1, Third tail feather with some blackish on inner web; 
tail relatively short (about 68 mm.) : 
Cranioleuca baeri (Berlepsch). 
(Cosquin, Cordova, Argentina.) 
h’. Three outer pairs of tail feathers uniform rufous or 
brownish rufous. 
h’. Upper tail coverts dark rufous. 
1. Upper parts brown; rump slightly brownish ru- 
fous; under parts, sides and flanks brownish 
ashy; large throat spot deep rufous chestnut 
Cranioleuca neglecta (Cory).* 
(Macate, Peru.) 
* This may prove to be the same ag pudibunda, but the throat spot and coloration of 
the tail feathers is quite different from the description of that species, as given by Sclater 
and Taczanowski. 
