Vol. XVII 
1900 
PaLtMER, The Maryland Yellow-throat. 217 
tributed over most of North and Central America and part of 
South America, from sea level to about 6000 feet, and exhibits 
considerable diversity in extent and intensity of color areas, espe- 
cially in the males. These color values, together with slight 
structural characters, permit of the forms being arranged in nine 
natural geographical and evolutional groups. Without violence, 
the genera MMicroligea (Santo Domingo) and TZeretristis (Cuba) 
may both be included in Geothlypis. The former, G. palustris, is 
a tropical G. agz/is, and the latter, G. formst and fernandine, are 
ancestral representatives of Geothyfis, and but slightly specialized. 
Natural groups of Geothlypis as shown principally in the Males. 
1. No black, grayish above, yel- ; formsz, Cuba. i 
low beneath. l fernandine, ie 
2. Head, neck and breast slaty, ( 
short wings, long tail, Q< palustris, Santo Domingo. 
slightly slaty. 
3. Head, neck and breast slaty { agilis U Britich: America: 
with slight black areas, long | salad, Western UsS. 
wings, short tail, @ nearly } Fedele aS 
similar. L 
[ saese eae. Northeastern U.S. 
faaeiced | trichas, Eastern U.S. 
alee i-) roscoe, Southeastern U. S. 
occidentalis, Western U. S. 
melanops, Northeastern Mexico. 
b. less def- ( rostrata, New Providence Id., Bahamas. 
inite, in-~ tannert, Abaco Id., Bahamas. 
L sular. | cory? Eleuthera Id., Bahamas. 
5. Yellow and black head bands, ( deldingz, Lower California. 
rich coloration, @ without flavovelata, Southern Mexico. 
black. | flaviceps, Southeastern Mexico. 
ae ?, Southern Mexico. 
6. Black face band, broad om spectosa*, Southern Mexico. 
4. Pale slaty, and | 
black face bands, 4 nental. [ 
absent in Q. 
short, very rich coloration,< bazrdz, Western Central America. 
2 without black. | chertquensts, Northern Colombia. 
| semiflava, Colombia. 
7. Facial black short and nar- { eguznoctialis, Northern S. America. 
row, slaty crown patch, rich< auricularts, Peru. 
coloration, 2 without black. | velata, Brazil. 
1 Subgenus Oforornis. ? Slight slaty crown patch. 
