Bates remarks, that he several times shot, by mistake, a humming-bird hawk-moth, instead of a bird. This moth (Macroglossa Titan) is smaller than humming-birds generally are, but its manner of flight, and the way it poises itself before the flower whilst probing it with its proboscis, are precisely like the same actions of humming-birds. This resemblance has attracted the notice of the natives, who firmly believe that one is transmutable into the other. The resemblance between this hawk-moth and the humming-bird is certainly very curious, and strikes one, even when both are examined in the hand. Holding them sideways, the shape of the head and position of the eyes in the moth are seen to be nearly the same as in the bird, the extended proboscis representing the long beak. At the tip of the moth's body there is a brush of long hair-scales, resembling feathers, which, being expanded, looks very much like a bird's tail; but, of course, all these points of resemblance are merely superficial. He one day saw a little pigmy, belonging to the genus Phaethornis, in the act of washing itself in a brook. It was perched on a thin branch, whose end was under water. It dipped itself, then fluttered its wings, and plumed its feathers, and seemed thoroughly to enjoy itself alone in the shady nook which it had chosen. "There is no need for poets to invent," he adds, "while nature furnishes us with such marvellous little sprites ready to hand." But these beautiful little creatures require a separate description. TOPAZ HUMMING-BIRD. The topaz humming-bird is perhaps the most resplendent and beautiful of its tribe. The fiery topaz (Topaza pyra) is found on the shores of the Rio Negro. The larger part of its feathers are of a blazing scarlet, which contrasts beautifully with the deep velvet-black of the head and part of the neck. The throat is emerald-green, with a patch of crimson in the centre. The lower part of the back, and the upper tail-coverts, are of a resplendent green with an orange gloss; and the wings and tail of purple-black, the two elongated feathers of the tail excepted--they being of a purplish-green. Its nest appears as if formed of leather, and is so cleverly woven that it can scarcely be distinguished from the bark or fungi growing on the branch to which it is fixed. ARA HUMMING-BIRD. The crimson topaz, or ara humming-bird (Topaza pella), vies with it in beauty. Its hues are of a deeper crimson. The tail is of a reddish-buff, except the two central feathers, which are of the same hue as the preceding. Unlike most humming-birds, it is of a shy and retiring disposition, and seldom ventures from among the deep shades of the forest; and then only at early dawn, or late in the evening, when it may be seen darting across the stream in search of insects, on which it chiefly feeds. THE RACKET-TAIL HUMMING-BIRD.