558 



BULLETIN 50^ UNITED STATES NATIONAL MUSEUM. 



CHLOROSTILBON ASSIMILIS Lawrence. 



ALLIED EMERALD. 



Somewhat resembling C.canivetii salvini,hut 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 wliite; 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 female. — Above bright metalhc green or bronze-green, 

 usually more bronzy anteriorl}", 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 w^eb 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).^ 



o Thirty specimens. 



^ Thirteen specimens. 



Locality. 



M.^LES. 



Seven adult males from Panama (mainland). . 



Three adult males from Saboga Island 



Ten adult males from San Miguel Island 



Ten adult males from Costa Rica , 



FEMALES. 



Three adult females from Panamd (mainland) 



One adult female from Saboga Island 



Two adult females from San Miguel Island 



Seven adult females from Costa Rica 



Ex- 

 posed 

 culmen. 



14.1 

 14 

 14.4 

 13.4 



14.5 

 14 



15.2 

 13.9 



