274 CALIFORNIA MAMMALS. 



to part included in the membrane; wirigs narrow; color above 

 sooty mouse g'ray ; below smoke gray ; membranes dark brown. 



Length about 98 mm. (3.85 inches) ; tail vertebra 37 ( 1.45) ; 

 ear from crown 13 (.50) ; expanse of wings 310 (12.20). 



Type locality, Fort Mohave, Arizona. 



Mohave Bats have been taken in various parts of Arizona 

 and California. It is probable that they occur oi^er most of the 

 southwestern United States and northwestern Mexico. Stowell 

 found them in large numbers in the courthouse at Santa Clara, 

 California in February. I have taken them^ on the borders of 

 the Colorado Desert in March and April, and at San Diego in 

 November. I am under the impression that this species migrates, 

 but this is not yet proven tO' be a fact. Nearly all that I have 

 seen or heard of were taken in valleys, but probably a few get into 

 the lower mountains in summer. They seem to feed mostly on 

 species of insects that fly over water and damp places. They spend 

 the day in crevices of rocks, behind shutters and in cracKs of 

 buildings, sometimes in masses. They begin to fly rather early. 

 The flight is erratic but not swift. 



Nyctinomops femorosaccus Merriam. (Thigh — sack.) 



POCKETED BAT. 



Similar to mohavensis ; larger ; tail more than half exerted ; a 

 fold O'f membrane extends from the inner third of the femur to 

 the middle of the tibia, forming a pocket at the thigh ; ears con- 

 nected at the base; color dull brown. 



Length (type) 103 mm. (4.05 inches) ; tail vertebrfe 41 

 (1.60) ; free part of tail 23 (.90) ; ear from crown 14 (.55). 



Type locality, Agua Caliente (now called Palm Springs), in 

 the northwestern end of the Colorado Desert, California. 



I shot the type specimen March 27th, 1885, but have not re- 

 cognized more of the species since, and have seen nO' records of 

 further captures. 



