138 University of California Publications in Zoology [Vol. 10 



skull, $, no. 10850 (Field Mus.), Santa Eulalia, L. C, August 

 22, 1902, E. Heller; skull only, $, no. 15927 (Field Mus.), Val- 

 leeitos, L. C, September 26, 1902, E. Heller. 



After comparison of this material with that from the San 

 Jacinto Mountains, we are convinced that the latter belongs 

 with Elliot's species. Furthermore, we have collected specimens 

 from other localities in California. These are listed in the 

 accompanying table of measurements, and the following discus- 

 sion of characters is based upon this California material. 



Myotis orinomus Elliot 

 La Grulla Brown Bat 



Basis of Diagnosis : Male adult, no. 2045, Mus. Vert. Zool. ; 

 Garnet Queen Mine, 6000 feet, Santa Rosa Mountains, Riverside 

 County, California; June 26, 1908. 



Diagnosis: Similar in general characters to Myotis calif or- 

 nicus californicus, but size slightly larger, colors paler, cranium 

 flatter and rostrum much broader. 



General Description : Size small, decidedly less than any 

 other Myotis inhabiting California excepting M. c. californicus, 

 M. c. pallidus and M. yumam nsis. As compared with yumancu- 

 sis, orinomus is but very slightly smaller in general dimensions, 

 but with distinctly smaller thumb, and much smaller feet, length 

 of foot being seven instead of nine millimeters. 



In color above, orinomus is tawny olive (of Ridgway's 

 Nomenclature of Colors, 1886) instead of broccoli brown, as in 

 ywmanensis. Beneath, the difference is less marked, but a tawny 

 suffusion is apparent in a much brighter tinge of brown than in 

 any of a very large series of yumanensis. 



M. orinomus differs from M. californicus and M. c. pallidus 

 in decidedly larger size throughout; ears, thumb and feet being 

 particularly large ; the latter seven instead of five millimeters in 

 length. In color orinomus is paler than californicus, except 

 below, and very much darker than pallidus. Californicus, as 

 represented by a specimen (no. 12981) from Yosemite Valley, 

 is deep mummy brown above; orinomus is bright tawny olive; 

 while pallidus is pale wood brown. 



