A MONOGRAPH OF THE BATS OF NORTH AMERICA. 89 



of the same? Alston (Biol. Centrali-Ainer. Mam., p. 25) extends the 

 ranj;e of T. luci/m/u-s to lU-azil and states that a- spe(;imen in the Uiitish 

 Mnsenm is so labeled. According to the views expressed coneeiiiing 

 r. hicipiijus under the head of V. (/ryphus, the lucifugan phase is a 

 jx'domorphic form. It is probable therefore that 1'". (ilbcscrns has a 

 pcdomorjthic form which can not be distinguished from the same form 

 oi" the closely allied si)ecies T. f/ri/phns. I have seen no such form, how- 

 ever, in collections made in the United States. 



In the first edition of the Monograph, p. 5(i, I assign T^. Incifugus a 

 distribution as f\ir south as the isthmus of Panama. I now believe 

 that the Neotroi>ical forms simulating T". _</n/y;//».S' ///ci/W;?/.s' are exam- 

 ples of i)edomorphism in V. (dhescexs. C. H. Merriam identifies V. 

 luclfiKius (three si)ecimens) in collections from Little Spring, at the 

 north foot of San Francisco Mountain, Arizona. 



Var (rt). — Vespertilio albescens evotis (H. Allen). 



Vespertilio evoiis H. Alien, Monog. IJats N. A., 1864; Dobson, Cat. Cliirop. Brit. 

 Mns., 187S, 324; J. A. Allen. Bull. Am. Mus. Nat. Hist., 1893, v, 202; Merriam, 

 Mammals of San Francisco Mt. Region, N. A. Fauna, No. 3, August, 1890, 46; Alston, 

 Biol. Central!- Amer., Mam, 1879-82, 1. 



Bescription. — Head rather small ; face pointed, moderately whiskered, 

 sn<mt produced j ears large, high, erect, oval, not turning outwardly, 

 long, subacumite, slightly diverging tragus; thumb slender; foot of 

 moderate size; ample interfemoral membrane; last joint of tail exsert. 

 The membranes are of a light brown color, tending in some to a darker 

 hue. Hair long and soft, plumbeous at base behind, with light brown 

 tips inclined to yellowish toward the head. The fur in trout is dark 

 maroon or l)lack at base, with whitish tii)s. The basal third of the ear 

 is covered with hair at base; at the base of the interfemoral membrane 

 behind a tuft of hair is seen. In two specimens the fur liad a darker 

 tinge, the tips behind being dark olive-brown, the base being black. 

 This variety has the largest ear of any of the American species of Ves- 

 pertilio. 



The above description is copied (Avith the substitution of the word 

 "variety'' for "species'') from the first edition of the Monograph, page 

 •48. 



Ilerein is embraced a group of forms which tind ex]n-ession in the 

 highlands of Montana, Washington, ('oh)rado, and xVrizona, though 

 sparsely tound in California. 



The auricle is large, ordinarily coordinated with long, straight, slen- 

 «ler tragus, though this is not constant ; posterior border of the ear not 

 emarginated; the membranes are almost always black; the foot is 

 small; the tip of tail, as a lule, is moderately exsert; i)ostcalcaral h>be 

 often present; pigment in the second digital interspace is occasionally 

 absent. 



