158 Proceedings of the Biological Society of Washington. 
2. Two outer tail feathers uniform brownish rufous; third tail 
feather with blackish border on inner web; under parts rufous 
cinnamon; size larger, wing about 72 mm. 
Cranioleuca? graminicola (Sclater).* 
(Near Junin, Peru.) 
b?. Outer tail feathers largely dark brown (not uniform rufous or 
brownish rufous); under parts buffy white. 
1. Bill shorter; exposed edges of basal part of inner primaries not 
rufous; inner tail feathers blacker and the pale edging not so 
pronounced; throat patch larger; darker rufous wing (about 
70 mm.) Cranioleuca humilis humilis (Cabanis). 
(Junin, Peru.) 
2. Bill longer; exposed edge of basal part of inner primaries rufous; 
pale edging on inner tail feathers brighter and more conspicu- 
ous; throat patch smaller; paler rufous wing (about 67) 
Cranioleuca humilis marayniocensis (Berlepsch and Stolzmann). 
(Maraynioc, C. Peru.) 
8. Similar but larger; wing about 74 mm. 
Cranioleuca humilis robusta (Berlepsch). 
(Iquico, W. Bolivia.) 
b!. Upper parts olive buffy or olivaceous tawny streaked with blackish. 
b?. Cap plain bright rufous; size smaller, wing less than 55 mm.; 
tail attenuated and sharply pointed 
Siptornoides (Eusiptornoides maluroides (d’Orbigny and Lafresnaye). 
(Buenos Aires, Argentina.) 
c?. Cap not plain rufous; whole crown streaked; size larger, wing 
much more than 60 mm.; tail attenuated and pointed. 
c?, Superciliary stripe whitish or buffy white. 
1. Throat spot rufous;{ flanks and under tail coverts not dis- 
tinctly streaked; smaller, wing 70 mm. or less 
Siptornoides (Eusiptornoides) anthoides (King). 
(Straits of Magellan.) 
2. Throat spot yellowish or rufous; flanks and under tail cov- 
erts more or less streaked; wing about 74 mm. 
Siptornoides (Eusiptornoides) hudsoni (Sclater). 
(Conchitas, Buenos Aires, Argentina.) 
8. Throat spot rufous; lower abdomen and flanks uniform fawn 
color without streaks; size of hudsont 
Siptornoides (Eusiptornoides) lillot (Oustalet).t 
(Tucuman, Argentina). 
* T have not seen graminicola Sclater and it may belong to a different genus. 
¢ The gular patch and general color of the throat is very variable and may be due to 
age. Inthis connection Mr. Charles Chubb writes meas follows: ‘The colour of the throat 
is a variable character which occursin both male'and female being sometimes white dotted 
with black, at others lemon or sulphur yellow, and many (at all seasons of the year) cin- 
namon rufous.” 
} I have not seen specimens of either lilloi or punensia, 
