174 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
Adult female.—Length (skins), 104-120 (113); wing, 58-66 (61.2); 
tail, 43.5-48 (46); culmen, 11-14 (13.1); tarsus, 14-15 (14.1); middle 
toe, 11-13 (11.9).2 
Southeastern Mexico, in States of Vera Cruz (Cérdova; Playa 
Vicente; Uvero; Buena Vista), Oaxaca, Tabasco (Teapa), and Yuca- 
tan (La Vega), and southward through Guatemala (Chocttim; sources 
of Rio de la Pasién), British Honduras (Orange Walk; Cayo; Toledo 
District; near Manatee Lagoon), Honduras (San Pedro; Montafias; 
Santa Ana; Rio Blanco; Rio Segévia), Nicaragua (Castillo; Rio San 
Juan; San Emilis, Lake Nicaragua) and Costa Rica (Grécia; Angos- 
tura; San José; Tucurriqui; Guapiles; Carrillo; Corallillo; Guayabal; 
Orosi; El Hogar; Guayabo; Jiménez; Pozo Azil de Pirris; Pozo del 
Pital; Pozo del Rio Grande; Lagarto; Boruca; Paso Real; El General; 
Tenério; Buenos Aires; El Pozo de Térraba; Pigres; Pacuare; Palmar; 
Bebedero; Cerro Santa Maria; Miravalles; La Vijagua; Bolsdén), to 
Panamé (Santa Fé de Verégua; Calovévora; Bugaba; Bibalaz; Volcan 
de Chiriqui; Boquete; Divala; Panam4; Lion Hill). 
Xenops mexicanus ScuatER, Proc. Zool. Soc. Lond., 1856 (pub. Jan. 26, 1857), 
289 (Cérdova, Vera Cruz, Mexico; coll. A. Sallé); 1859, 382 (Playa Vicente, 
Vera Cruz); Cat. Am. Birds, 1862, 159 (Oaxaca).—Sanvin, Ibis, 1861, 353 
« Highteen specimens. 
Locality. Wing. | Tail. a Tarsus. middle 
MALES, 
Two adult males from Vera Cruz, Mexico..........--.------+-+ 64 50 13 14.5 12.5 
Three adult males from British Honduras......-........--...- 63.5 48.5 13.2 14.8 12 
Five adult males from Honduras.........---------------- S..--| 63.1 47,2 13.3 14.5 11.8 
Ten adult males from Nicaragua (1) and Costa Rica (9)........ 65,2 49.6 13.3 14.9 12.1 
Two adult males from western Panamé (Divala, Chiriquf)..... 66, 2 52.2 13.5 14.7 12.2 
Two adult males from eastern Panama (line of railway)........ 60.7 45.5 12.7 14.5 12 
One adult male (X. g. genibarbis) from Suriném............... 67 52.5 15 14.5 12 
One adult male (X. g. genibarbis) from Brazil (Maribatanas)...| 63.5 41.5 14 15 11.5 
FEMALES. 
One adult female from Vera Cruz...........-----.-.-0eeeee eee 61 46 18 14.5 12 
One adult female from Yucatan 62 46 13.5 14 11.5 
Two adult females from British Honduras..............2..-.. 60 46 12.7 14 11.2 
One adult female from Honduras.............-222--2eee eee eee 60 46 13 14 11.5 
Ten adult females from Costa Rica............. 61.6 45.7 13 14.5 12.2 
Two adult females from western Panamdé 62.5 47 13.7 14.5 11.7 
One adult female from eastern Panamé..............----.2...- 58 46.5) 125] 14 12 
Specimens from British Honduras are more buffy (less olivaceous) below and 
more rufescent above than those from Costa Rica, etc., the latter being much more 
olivaceous (less brownish) below as well as above, than those from Mexico. Those 
from the Santa Marta district of Colombia are paler above, with middle rectrices 
cinnamomeous rather than rufescent, the under parts paler and grayer, wing shorter, 
and tail longer. The species almost certainly requires further subdivision. 
