72 BULLETIN 144, UNITED STATES NATIONAL MUSEUM 



MYOTIS YUMANENSIS LUTOSUS, new snbspeciea 



Myotis yumanensis Millee, North Amer. Fauna, No. 13, p. 66, October 16, 1897 

 (part). 



Type.—A^AM\t female, skin and skull, No. 50783, United States 

 National Museum (Biological Survey collection), from Patzcuaro, 

 Michoacan, Mexico. Collected July 17, 1892, by E. W. Nelson. 



Distribution. — Southern portion of the Mexican highlands. 



Diagnosis. — Color darker and richer than in Myotis yumanensis 

 sociahHis; underparts distinctly washed with brownish. 



Color. — The color differs conspic'uously from that of the typical 

 form of Myotis yumanensis., being a dark cinnamon brown above, 

 nearly Front's brown (Ridgway, 1912), the bases of the hairs in 

 adults but very little darker. Below, the extreme bases of the hairs, 

 except in the anal region, are blackish brown, paling into fuscous in 

 their upper part and tipped with dull gray, the entire ventral surface, 

 especially at the sides, having a faint brownish wash. Ears and 

 membranes dull brownish, the tip of the tail paler. 



Measureiivents. — For measurements see tables, pages 74 and 76. 



Specimens examined. — Total number 33, from the following lo- 

 calities : 



JALISCO: 2 ale. (B.M.). 



MICHOACAN: El Molino, 1 ale. (U.S.N.M.) ; Patzcuaro, 2 skins, 7 ale. 



(U.S.N.M.). 

 SAN LUIS POTOSI: Ahualulco, 9 ale. (U.S.N.M.); La Parada (Hda.), 



3 ale. (U.S.N.M.) ; Jesus Maria, 7 ale. (U.S.N.M.). 

 ZACATECAS: San Juan Capistrano, 1 skin, 1 ale. (U.S.N.M.). 



Remarks. — In its dull brownish (muddy) color this Mexican bat 

 resembles Myotis yumunen^is sociabilis, but the brown is slightly 

 richer, and in the adults there is very little contrast between the tips 

 and the bases of the hairs above. The darker belly with its distinct 

 brownish wash is also apparently characteristic. An immature speci- 

 men from Zacatecas, Mexico, is slightly paler and the hairs of the 

 upper parts are rather distinctly bicolor. Between the ranges of 

 these two dark forms, typical yum/inensis with its pale coloration 

 intervenes. Thus far very few specimens of the Mexican race have 

 been available. Hence the exact definition of its range must await 

 further coUectins:. 



