Carriker : List of the Birds of Costa Rica. 611 



on rump and abdomen ; tail edged with buff ; buffy gular and 

 malar stripe. Phaethornis longirostris longirostris, $ , 9 • 



dd. Central pair of rectrices not greatly elongated, if at all. 



e. Lower and upper parts shining blue-green ; rump and upper tail- 

 coverts bluish; a rusty gular stripe; middle rectrices pointed, with 

 shafts white at tips. Phaethornis guy coruscus, $ . 



ee. Lower parts largely or entirely cinnamon-buff; bronzy-green above. 

 /. Basal half and tips of rectrices white. Threnetes ruckeri, $ , 9 • 



ff. Basal half of rectrices chestnut, tips white. 



Glaucis hirsuta ceneus, $ , 9 • 

 aa. Exposed culmen less than 29 mm., usually not more than 25 mm. 



b. Two or more pairs of lateral rectrices largely or wholly white (if other color 

 present, located at tip of feathers). 

 c Entire lower parts immaculate white; deep shining green above 

 d. Tail at least 65 mm. long; no violet-blue on crown. 



Heliothrix barroti, 9 t 

 dd. Tail not more than 50 mm. long; forehead and crown glittering violet- 

 blue. Heliothrix barroti, $ . 

 cc. Entire under parts not immaculate white. 



d. All the rectrices, except the middle pair, largely white. 

 e. Throat and crown greenish-blue, or else entire under surface to vent 

 glittering green. 

 /. Throat and crown greenish-blue; abdomen white; back green. 



Florisuga mellivora, $ . 



ff. Entire under surface (to vent) glittering green; crown and central 



rectrices deep bronze. Elvira cupreiceps., $ . 



ee. Entire under parts nearly white; sides of head and throat green; lateral 



rectrices tipped with white, leaving a narrow subterminal, oblique 



bar. Elvira cupreiceps, 9 • 



dd. Not more than three outer pairs of rectrices white. 



e. Lower parts glittering green or grayish-white; green above. 

 /. Lower parts glittering green. 



g. Only two lateral rectrices white, tipped with deep blackish. 



Eupherusa egregia, $ . 

 gg. Three lateral rectrices white, tipped with bronzy-black; secon- 

 daries not brown. Elvira chionura, $ . 

 ff. Lower parts grayish-white; soft green above. 



g. Only two outer rectrices white; bill 18 to 19 mm. 



Eupherusa egregia, 9 • 

 gg. Three outer rectrices white, with or without a dark subterminal 

 bar. 

 h. No dark subterminal bar. Elvira nigrivenlris, 9 • 



hh. Dark subterminal bar present. Elvira chionura, 9 • 



ee. Lower parts not as in (e); whole throat, abdomen, breast, and forehead 

 deep black, green above; under tail-coverts and three outer rec- 

 trices white. Elvira nigrivenlris, $ , 



