HUMMINGBIRDS 233 



5. Exposed culmen not more than half as long- as tail ; with white 



stripe back of eye Basilinna, p. 243. 



5'. Exposed culmen more than half as long as tail ; without white 



stripe back of eye Amizilis, p. 243. 



3'. Nostrils nearly or wholly feathered. 

 4. Wing more than 2.40. 



5. Tail chiefly black gorget of male intense blue. 



Cceligena, p. 234. 

 5'. Tail wholly (male) or partly (female) greenish bronze, gorget 



of male emerald green Eugenes, p. 233. 



4'. Wing less than 2.25. 



5. Middle tail feathers broader near end than toward 

 base spatulate Stellula, p. 241. 



Fig. 300. 

 5'. Middle tail feathers narrower near end than toward base. 



6. Tail partly rufous Selasphorus, p. 238. 



6'. Tail without rufous. 



7. Adult males with top of head like gorget ; 

 females with outer tail feathers broadly 

 linear Calypte, p. 236. 



7'. Adult males with top of head like back ; 

 females with outer tail feathers concave on 

 inner side .... Trochilus, p. 234. 



GENUS EUGENES. Fig. 302. 



426. Eugenes fulgens (Swains.). RIVOLI HUMMINGBIRD. 



Bill flattened and slightly widened at base ; tail slightly forked in male, 

 double rounded in female ; tarsus feathered. 

 Adult male : top of head metallic purplish, gorget 

 brilliant emerald green ; rest of upper parts bronzy 

 green ; under parts blackish green or dull bronzy, 

 breast black in some lights. Adult female : top of 

 head dull brownish, small white spot behind eye ; 

 rest of upper parts bronzy green ; lower parts 

 brownish gray, sides washed with green ; tail with 

 outer feathers very broadly tipped with pale gray 

 or whitish. Young : similar to adult female, but 

 feathers of upper parts with pale buffy edgings. 

 Male: length 4.50-5.00, wing 2.90-3.10, tail 1.90- 

 2.00, bill 1.00-1.20. Female: wing 2.60-2.75, tail 

 1.70-1.90, bill 1.00-1.15. 



Distribution. Mountains of southeastern Ari- 

 zona and mountains bordering tablelands of Mex- 

 ico to'Nicaragua. From Kidgway, ! 



Nest. Usually in maples, sycamores, or firs, Fig 303 



35 to 50 feet from the ground, made of silky plant 



fibers and grass tops, coated with lichen and lined with sycamore down 

 and feathers. 



Food. Largely insects from flowers such as honeysuckle and agave. 



