BIRDS FROM COSTA RICA—-WETMORE 73 
: 
specimens that I have seen make it desirable to check this with more 
material. 
Chamaethlypis poliocephala palpebralis (Ridgway): 
Geothlypis (Chamaethlypis) palpebralis Ripaway, Manual of North American birds, 
1887, pp. 526, 592 (Mirador, Veracruz). 
Yellow of lower surface deeper and more extended distally than in 
polrocephala. 
Central Veracruz through northern Chiapas to eastern Guatemala. 
While the birds found in Campeche and Yucatdn are assigned to 
this race, the few specimens that I have seen have the yellow below as 
extensive as in caninucha, though above they are paler greenish like 
palpebralis. ‘They probably represent a distinct form, a matter to be 
decided with more material. 
Chamaethlypis poliocephala caninucha (Ridgway): 
Geothlypis poliocephala var. caninucha Ripaway, Amer. Journ. Sci. Arts, Dec. 
1872, p. 459 (Retalhuleu, Guatemala). 
Similar to palpebralis but brighter green above; yellow on lower 
surface more extensive, covering the abdomen. 
Southern Chiapas through western Guatemala, Honduras, and 
eastern Nicaragua. 
The lack of white on the eyelids alleged in early writings as a charac- 
ter in this form is not stable, as white is present in some specimens, 
though usually in reduced amount where found. 
This form may range to extreme northeastern Costa Rica. 
Chamaethlypis poliocephala icterotis (Ridgway): 
Geothlypis caninucha icterotis Ripaway, Proc. U. S. Nat. Mus., vol. 11, Sept. 20, 
1889, p. 589 (Costa Rica). 
Similar to caninucha but somewhat duller above; yellow below a 
little paler, somewhat less extensive; flanks lighter brown; fall plumage 
definitely browner above. 
Western Nicaragua to central Costa Rica. 
In this race the yellow below is about as extensive as in palpebralis. 
It is distinguished from that race by having the dorsal surface brighter 
ereen, and the flanks darker brown. We have one specimen from 
Managua, Nicaragua, that belongs here. 
Chamaethlypis poliocephala ridgwayi Griscom: 
Chamaethlypis poliocephala ridgwayt GRiscom, Proc. New England Zoél. Club, 
vol. 12, Apr. 3, 1930, p. 7 (Boruca, Costa Rica). 
Similar. to caninucha but deeper yellow below; greener above; 
slightly smaller in size. 
Southwestern Costa Rica (Térraba Valley) and western Panamé 
(Boquete, Volcan de Chiriquf). 
