590 PROCEEDINGS OF THE ACADEMY OF [J^jly? 



Myotis yumanensis (H. Allen). 



One specimen, Mount Tallac. July 6. 

 Eptesicus fuscus melanopterus Rehn n. subsp. 



Tt/Pe.— Mount Tallac, California, z. July 10, 1898. No. 11,685, 

 Coll. Acad. Nat. Sci. Pliila. Collected by A. S. Bunnell. 



General Characters. — Similar to E. fiiscus osceola Rhoads in size and 

 cranial characters, but differing in the darker upper surface, the grayer 

 under parts and the blacker membranes. From fuscus it may immedi- 

 ately be differentiated by the more reddish-brown upper surface and 

 less silvery under parts. 



Distribution. — Specimens from the type locality only have been 

 examined. 



Size. — In general proportions fuscus. f. osccola and /. meIa7iopterus 

 seem almost identical. The average of five specimens of each shows 

 that /. melanopterus has the forearm averaging almost three milli- 

 meters longer than in fuscus, Avhile osceola is considerably smaller than 

 the former, and very slightly less than the latter. 



Color. — Above rather dark cinnamon, lightest on the top of the head 

 and at the shoulders. Under surface reddish wood brown. Mem- 

 branes and face deep blackish. In true fuscus the upper surface is 

 drab, below pale isabella color. In fuscus osceola the upper parts are 

 much the same tint as in melanopterus, but not as rich in tone, while 

 the under parts are more of a yellowish-brown, and not as ashy in tint. 

 The membranes of fuscus osceola are much paler in coloration than in 

 melanopterus. 



Skull. — Identical with the typical form. 



Teeth. — The last upper molar in melanopterus appears to be broader 

 than in fuscus or /. osceola. Otherwise the dental series seem to be 

 identical. 



Remarks. — The form from Mount Tallac is no doubt closest related 

 to /. osceola than any of the form of fuscus. The original series of the 

 former has been examined in this connection, and the differential 

 characters were drawn from it. The relationship with true fuscus 

 is not so close as an examination of a series of thirty specimens from, or 

 within a radius of, twenty miles of the type localit}^ shows. No close 

 relationship exists with E. f. hernarclinus Rhoads, which is a very 

 pale type quite different from any of the forms here considered. From 

 /. osceola the new form may be easily distinguished by the richer 

 color of the upper parts and the more smoky under surface, as well 

 as the more blackish membranes. 



Measurements. — Type : Total length 104 mm., length of tail vei'tebrae 



