GENERA AND SPECIES. 185 



Locality : Brazil, Eio Negro. 



In this species we have a normal example of 

 the genus. The following note by Mr. Bridges, 

 communicated to the Zool. Soc. in 1843, by Mr. 

 Eraser (specimens of the birds accompanying 

 the note), is not without interest. 



" Trochilus Milleri, Lodd. Picaflor de la Cor- 

 dilliera. This beautiful and rare species of Hum- 

 ming-bird is only found in the elevated valleys of 

 the Andes, residing among storms of hail, rain, 

 and thunder, and in places where the Naturalist 

 would least expect to find a species of Trochilus. 

 It subsists more upon small flies than upon the 

 nectar of flowers . On the examination of the 

 crops I found them filled with flies, which they 

 take before sun-down, along the margins of the 

 mountain rivulets. The specimens in ttye pre- 

 sent collection were taken at Los ojos de Agua, 

 province of Aconcagua, at an elevation of from 

 6000 to 8000 feet; and I saw them at least 

 1000 feet above that place. Iris brown." 



Here then we have an example of a Humming- 

 bird which pursues its- prey on the wing along 

 the mountain water- courses, not so much by 

 day, as at that time " when eyening draws o'er 

 all her gradual dusky veil;" and herein are we 

 borne out in our previous observations as to the 

 crepuscular habits of many species, to whom in- 

 sects rising from the water and the bordering 

 herbage in evening are as attractive as they are 

 to the swallows in our island. In this short 



