The New York bat (vespertilio noveboracensis) which occurs here, does not vary in any degree from the general characters and appearance of individuals of the Atlantic States. The specimen we obtained is most unequivocally furnished with incisores in the superior jaw, which by Pennant[39] were denied to exist in the species of this name. These teeth being small, and hardly rising to a level with a line of the intervening callosity, might be readily overlooked by a casual observer, who does not aid his vision by the use of the lens. In adducing this fact, it must not be understood that we affirm the existence of those teeth in individuals of this species generally; we only refer to the single specimen before us. {253} A small bat was shot this evening during the twilight, as it flew rapidly in various directions over the surface of the creek. It appears to be an immature specimen, as the molares are remarkably long and acute: the canines are very much incurved, and the right inferior one singularly bifid at tip, the divisions resembling short bristles. This species is beyond a doubt distinct from the Carolina bat, (V. Caroliniana, Geoff.) with which the ears are proportionably equally elongated, and, as in that bat, a little ventricose on the anterior edge, so as almost to extend over the eye; but the tragus is much longer, narrower, and more acute, resembling that of the V. emarginatus, Geoff. as well in form as in proportion to the length of the ear. We call it V. subulatus, Say; and it may be thus described,--ears longer than broad, nearly as long as the head; hairy on the basal half; a little ventricose on the anterior edge, and extending near to the eye; tragus elongated, subulate; the hair above blackish at base, tip dull cinereous; the interfemoral membrane hairy at base; the hairs unicoloured, and a few also scattered over its surface and along its edge, as well as that of the brachial membrane; hair beneath black, the tip yellowish-white; hind-feet rather long, a few setæ extending over the nails; only a minute portion of the tail protrudes beyond the membrane; total length, two inches and one-tenth; tail, one and one-fifth. This encampment was situated about eighteen miles above the confluence of that tributary of the Arkansa called, in Pike's map, "The First Fork;" and by our computation near one hundred miles from the base of the mountain.[40] James's Peak was still visible, bearing north, 68° west; and the Spanish peaks, the westernmost of which bore south, 40° west. The observations made here received the most minute and careful attention. The moon was at this time too near the sun to admit of taking her distance from that luminary, and too near Antares {254} for an observation. The distance of Spica Virginus was too great, and the star was too near the horizon; yet we trust accurate deductions may be made from the distances which are given in the Appendix.[41]