400 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
CALLIPHARUS NIGRIVENTRIS (Lawrence). 
BLACK-BELLIED HUMMING BIRD. 
Adult male.—¥orehead, crown, and under parts velvety black, the 
under tail-coverts white; occiput, hindneck, back, scapulars, and 
wing-coverts metallic bronze-green, the upper tail-coverts duller and 
more bronzy; four middle rectrices dusky bronze or dull blackish 
glossed with bronze; three lateral rectrices (on each side) white, 
sometimes margined terminally with dusky; secondaries cinnamon- 
rufous tipped with brownish dusky (the innermost with metallic 
bronze-green); primaries dusky purplish bronze, the innermost 
becoming cinnamon-rufous basally; primary coverts dusky; bill 
black, the mandible more or less brownish (pale dull flesh color in 
life) basally; iris dark brown; feet dusky (in life white, with scutella 
pale brownish); length (skins), 72-87 (79); wing, 46-50.5 (48.3); 
tail, 26.5-30 (27.9); culmen, 13.5-15 (14.5).¢ 
Adult female——Above metallic bronze-green; four middle rectrices 
dull greenish bronze or dull blackish, becoming bronzy basally; two 
outer rectrices (on each side) white, the third mostly white, but with 
more or less of dusky on edges, especially terminally; remiges dusky, 
faintly tinged with purplish bronze, the secondaries and inner prima- 
ries passing into cinnamon-rufous basally; under parts dull grayish 
white or pale brownish gray, the sides and flanks mostly metallic 
bronze-green; bill, etc., as in adult male, but feet paler; length 
(skins), 73-87 (79); wing, 44-47 (45.8); tail, 25.5-29 (27.1); culmen, 
14.5-16 (14.9). 
Immature male.—Similar to the adult male, but forehead and crown 
dull metallic bronze-green (instead of velvety black), and black of 
under parts duller and more restricted, the under parts of body (except 
medially) mostly dull dusky bronze-greenish. 
Costa Rica (Peorsnada; Naranjo de Cartago; Cervantes; La 
Hondura; Coliblanco; Cariblanco de Sarapiqui) and western Panama 
(Veragua; Lomo Lleno; Cordillera del Chucu; Calobre; Caribbean 
slope Volcdn de Chiriqui, 6,000-7,000 ft.). 
«Thirteen specimens. b Hight specimens. 
' i Cul- 
Locality. Wing. | Tail. anen’ 
MALES, 
Ten adult males from Costa Rica....-...---------+---e esse cence eee ee eee eens 48. 2 28.1 14.5 
Three adult males from western Panamé (Verdgua)................22..22222202+ 48.5 27 14.3 
FEMALES, 
Six adult females from Costa Rica. .....-.-. 2.22.2. ee ence eee eee eee eee eee 46 27.6 15 
Two adult females from western Panamé (Verdgua)..............2222-.....e28. 45, 2 25.7 14.7 
