558 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
CHLOROSTILBON ASSIMILIS Lawrence. 
ALLIED EMERALD. 
Somewhat resembling C. canivetii salvini, but smaller (wing decidedly 
so), green of upper parts darker and less golden, tail more strongly 
glossed with blue, and bill wholly black. 
Adult male—Above uniform deep metallic grass green, the upper 
tail-coverts sometimes slightly more bluish green; tail uniform 
glossy blue-black or black strongly glossed with steel blue; remiges 
dark brownish slate or dusky, faintly glossed with violaceous; under 
parts bright metallic green (much more brilliant and decidedly more 
yellowish than upper parts); femoral tufts white; bill wholly dull 
black, the basal portion of mandible sometimes slightly more brown- 
ish; iris dark brown; feet dusky; length (skins), 67-84 (77); wing, 
44-48.5 (45.6); tail, 25.5-30 (27.8); middle rectrices, 17-21 (19.4); 
culmen, 12.5-15 (14).¢ 
Adult jfemale——Above bright metallic green or bronze-green, 
usually more bronzy anteriorly, purer green posteriorly, especially. 
on upper tail-coverts; tail glossy blue-black (the middle rectrices 
sometimes dark metallic green), the lateral rectrices with basal third 
(approximately) of outer web dull metallic green (or grayish glossed 
with green), the two or three outermost tipped (more broadly on 
lateral pair) with pale gray; remiges dusky, faintly glossed with 
purplish; loral, suborbital, and auricular regions dusky, the latter 
margined above by a postocular streak of pale gray or grayish white; 
rictal and malar regions and under parts plain pale gray, the outer 
portion of sides and flanks overlaid by metallic green or bronze- 
green; femoral and lumbar tufts white; bill black; feet dusky; length 
(skins), 69-77 (74); wing, 42-46 (44.1); tail, 23.5-26 (25); middle 
rectrices, 20.5-24 (22.1); culmen, 13-15.5 (14.3).° 
a Thirty specimens. b Thirteen specimens. 
: Lateral] Middle] Ex- 
Locality. Wing. | rec- rec- | posed 
trices. | trices. |culmen. 
MALES. 
Seven adult males from Panamé (mainland)................222222--265 45.3 28 18.9 14.1 
Three adult males from Saboga Island.......-......--.....ce cece ee ee eee 45.7 28.3 19.3 14 
Ten adult males from San Miguél Island............-..-.--.2202-..20-- 46.4 28.1 19.8 14.4 
Ten adult males from Costa Rica........---.---.-- + eee ee eee eee eee ee eee 45 27.4 19.3 13.4 
FEMALES. 
Three adult females from Panamé (mainland)........-.-........-....6- 43.7 25 22.3 14.5 
One adult female from Saboga Island.......-..---.-------+ BREN eS ie 45 25 22 14 
Two adult females from San Miguél Island.........--.--+-------seee ee 46 247) 21,2 15.2 
Seven adult females from Costa Rica. ........- 6... eee eee eee ee ence eee e ee 43.6 | © 25.1 22.4 13.9 
