﻿78 



NORTH AMERICAN FAUNA. 



aud tlic Pacilic coast from Puget Sound to Cape St. Lucas. Mouterey, 

 Cal. (one of the localities given), may be selected as the type locality. 



GeograpJiic distrihtition. — Austral and Transition zones from the 

 Pacific Coast to the eastern edge of the Kocky Mountains 5 south to 

 Yera Cruz. 



General eharacters. — Size large; length 85 to 92 j forearm 3G to 43. 

 Calcar longer tlian free border of uropatagium, slender, distinct, and 

 with a more or less Avell-developed lobule at the tip. Free border of 

 uropatagium naked or very indistinctly ciliate. Ears ver^^ long, reach- 

 ing 7 to 10 mm. beyond tip of nose. Wing from base of toes. 



Uars. — The ears (PL I, tig. 6) are long and slender; laid forward they 

 reach considerably (7 to 10 mm.) beyond tip of nose. Anterior border 

 of auricle regularly convex from base to a i^oint slightly beyond mid- 

 dle, thence straight or nearly so to the tip. Posterior border slightly 

 concave immediately below tip of ear, then gradually and moderately 

 convex to base. Basal lobe strongly developed, and notched on the 

 lower border. The auricle is usually marked with three or four distinct 

 cross ridges. 



Tragus long, slender, and pointed. The anterior border straight or 

 slightly concave from base to about mid height, then moderately con- 

 vex, the terminal third or fourth usually straight. Posterior border 

 with a small but distinct lobe at base. Above this lobe the margin 

 bends abruptly outward for a varying distance, sometimes forming a 

 sharp and conspicuous angle with the lower end of the concavity which 

 extends downward from the tip of the tragus, in other cases separated 

 from the latter by a region of varying extent in which the posterior aud 

 anterior borders are parallel. These variations bring about striking 

 contrasts in the form of the lower part of the tragus in different indi- 

 viduals, and suggest the existence of more than one species or race. 

 Specimens from approximately the same region, however, show both 

 extremes and intermediate conditions. 



Membranes. — The membranes are thin and light. Uropatagium hairy 

 on basal fifth, otherwise naked except for a few hairs along the nerves 

 and on the free border. Wing from base of toes (PI. II, figs. 3 and 4). 



Feet — The feet are moderately large, slightly less than half as long 

 as tibiai. Toes (without claws) distinctly longer than sole and united 

 by membrane through basal third of proximal phalanges. Whole dor- 

 sal surface of foot sprinkled with stiff hairs. Calcar distinct, equal to 

 or longer than free border of uropatagium, terminating in a lobule of 

 varying distinctness. Posterior border never distinctly keeled. 



Fur and color. — The fur is full, soft, and not peculiar in distribution. 

 It is light yellowish- brown, paler ventrally, the hairs everywhere dusky 

 slate at base. The absence of a series of skins of this bat makes it 

 impossible to describe the color accurately or compare it in detail with 

 that of its allies, M. thysanodes and M. subulatus. A skin from Shuswap, 

 British Columbia, has the fur of the back dull, pale raw umber, the 



