﻿MYOTIS YUMANENSIS. 



67 



Color pale wood brown, varying to broccoli brown ; belly dirty wMtish 5 

 tbe fur everywhere light plumbeous at base; ears and membrane very 

 light brown ; the uropatagium and wing membranes edged with whitish. 



Specimens from the type localit}^ are the palest that I have seen. 

 Those from Fort Verde, Arizona, and apparently also alcohohc specimens 

 from Tulare and other localities in southern California, are slightly 

 darker, but still very different from M. yummmisis satHratus. 



Skull. — The skull of Myotis yumanensis resembles that of 3£. lucifugus 

 in form, but is distinguished from the latter by its smaller size, and 

 shorter, broader i^alate. The brain case is broader and flatter than in 

 M. lucifugus. From the skull of M. caUfomicus that of 31. yumanensis 

 is readily distinguished by its slightly larger size and very much 

 broader, more robust form, the rostrum in x^articular being noticeably 

 broader. 



Teeth. — The teeth of 31yotis yumanensis (fig. 14 a) more closely resem- 

 ble those of M. hwifugus than any other species. They are, however, 

 smaller, and tbe crowns of the molars are longer in proportion to their 

 width. The crown of the third lower premolar is only slightly longer 

 than broad, thus resembling the corresponding tooth in M. lucifugus, 

 and differing from ii. californiciis^ which, like 31. suhulatuSj has the 

 crown of this tooth very distinctly longer than broad. 



Measurements. — See table, page 69. 



Specimens examined. — Total number 142, from the following localities : 



Arizona: Fort Verde, 6 (skins); White Mountains, 1 (skin, Am. Mus. Nat. 

 Hist.). 



California: Fort Reading, 1; Fort Ynma, 5 (skins); Fresno, 8; Horse Shoe 

 Bend, Colorado Kiv^cr, 1; Keelcr, 7; Lone Fine, 2; Mount Whitney, 1; 

 Nevada City, 2; Nicasio, 1; 0\yens Lake, 5; Owens Valley, 1; Old Fort 

 Tejon, 13; San Luis Rey, 8; Tulare, 45; W^alker Pass, Kern County, 1. 



Michoacan: Patzcuaro, 13. 



Nevada: Pyramid Lake, 1. 



San Luis Potosi : Jesus Maria, 7 ; Hda. La Parada, 3; Ahualulco, 9. 

 Utah: Provo City, 1. 



General remarks. — 3Iyotis yumanensis needs comparison with 31. caU- 

 fomicus only. From the latter it is readily distinguished by its much 

 larger foot and longer calcar. More detailed com^^arison of the two 

 will be found under 31. caUfomicus. 



This is the species to which Dr. Harrison Allen's recent account of 

 Vespertilio albescens for the most part refers. His so-called larger 

 melanic form of albescens is 3Iyotis lucifugus longicrus (True). Speci- 

 mens of 3Iyotis caUfomicus, 31. thysanodes, and 31. velifer in the Biologi- 

 cal Survey collection have been labeled by Dr. Allen V. albescens, the 

 last two, however, with a query. This bat is also the Vespertilio 

 macropus and V. nitidus macropus of Dr. Allen. The name macropus, 

 however, is preoccupied by Vespertilio macropus Gould, 1854.^ 



3Iyotis yumanensis is a much smaller bat than 31. albescens, and does 



1 Mammals of Australia {fide Dobson). 



