In my rambles in the neighborhood of Denver only a few species not previously described were observed, and yet there were some noteworthy points of difference in the avi-fauna of the two latitudes, which are only about seventy-five miles apart. It will perhaps be remembered that, in the vicinity of Colorado Springs and Manitou, the pretty lazuli buntings were quite rare and exceedingly shy, only two or three individuals having been seen. The reverse was the case in the suburbs of Denver and on the irrigated plains between that city and the mountains, and also in the neighborhood of Boulder, where in all suitable haunts the lazulis were constantly at my elbow, lavish enough of their pert little melodies to satisfy the most exacting, and almost as familiar and approachable as the indigo-birds of the East. It is possible that, for the most part, the blue-coated beauties prefer a more northern latitude than Colorado Springs for the breeding season. At the latter place I failed to find the burrowing owl, although there can be little doubt of his presence there, especially out on the plains. Not far from Denver one of these uncanny, sepulchral birds was seen, having been frightened from her tunnel as I came stalking near it. She flew over the brow of the hill in her smooth, silent way, and uttered no syllable of protest as I examined her domicile--or, rather, the outside of it. Scattered about the dark doorway were a number of bones, feathers, and the skin of a frog, telling the story of the _table d'hôte_ set by this underground dweller before her nestlings. She might have put up the crossbones and skull as a sign at the entrance to her burrow, or even placed there the well-known Dantean legend, "All hope abandon, ye who enter here," neither of which would have been more suggestive than the telltale litter piled up before her door. When I chased her from her hiding-place, she flew down the hill and alighted on a fence-post in the neighborhood of her nest, uttering several screechy notes as I came near her again, as if she meant to say that I was carrying the joke a little too far in pursuing her about. Presently she circled away on oily wings, and I saw her no more. [Illustration: "_The dark doorway_"]