FAMILY TROCHILIDAE 349 



with isanrae in this area in such a manner as to indicate that the former 

 is a representative of the urochrysia complex. Though some from 

 western Bocas del Toro are fairly close to the bird of Costa Rica the 

 conclusion of these authors (loc. cit., p. 305) was that "no examples of 

 isaurae from Costa Rica could be discovered and no typical melanor- 

 rhoa from Panama, although intermediates occur in both countries." 



On Cerro Campana these birds ranged in the heavy damp forest 

 on the summit. Elsewhere they were found low down in forest in areas 

 where the undergrowth was fairly open. Here they search twigs, and 

 also hawk for small flying diptera. As they fly their wings produce a 

 low humming sound, and often they utter squeaky, chirping calls. 

 The white under tail coverts may show clearly as they move in the 

 shadows of their haunts. A female caught in a mist net on the 

 Quebrada Venado back of Armila, San Bias, February 22, 1963, 

 was near breeding stage. 



This attractive hummingbird is dedicated to Madame Isaure de 

 Lafresnaye, wife of the well-known naturalist. Gould at the close of 

 the original description wrote that the name was suggested to him by 

 "my late highly valued friend the Prince Charles Lucien Bonaparte, 

 who wished thus to convey a compliment to Madame la Baronne de 

 la Fresnaye, the niece of Montbeillard, the able coadjutor of the 

 celebrated Buff on." 



LAMPORNIS HEMILEUCUS (Salvin) : White-bellied Mountain Gem, 

 Colibri Serrano de Barriga Blanca 



Oreopyra hemileuca Salvin, Proc. Zool. Soc. London, 1864 (Feb., 1865), p. 584. 

 (Turrialba, Costa Rica.) 



Medium size; male, chin green, throat light blue, breast white; 

 female, under parts white, sides spotted lightly with green. 



Description. — Length, 95-110 mm. Adult male, forecrown, side of 

 head and chin metallic emerald-green ; occiput, back, rump, and smaller 

 wing coverts metallic bronze-green ; sides of occiput black ; a white 

 stripe on side of head behind eye ; upper tail coverts and tail greenish 

 bronze, tipped with dull buff ; wings, including primary coverts, dusky 

 with a purplish sheen ; edge of wing pale cinnamon ; throat shining 

 purple-violet ; sides and under wing coverts bronze-green ; rest of 

 under surface white, spotted laterally with bronze-green. 



Adult female, like the male, but emerald-green of forecrown and 

 side of head duller ; chin and throat white like breast, spotted lightly 

 with bronze-green. 



Measurements. — Males (9 from Costa Rica, 1 from "Panama"), 



