268 CALIFORNIA MAMMAL.S. 



and Mexico. They are not abundant. In southern Cahfornia 1 

 have seen this species most frequently in the spring and fall mi- 

 grations. They are abroad in twilight. They frequent both 

 mountain and valley. 



Myotis thysanodes Millkr. (Fringe — like.) 



FRINGED BAT. 



Size medium; border of interfemoral membrane thickened 

 from end of calcar to tip of tail and distinctly fringed with hairs ; 

 ears rather long, reaching three to five millimeters beyond the 

 nostrils when laid forward; feet rather large; above dull yellow^- 

 ish brown; below a paler shade of the same color; fur every- 

 where blackish at base. 



Length about 90 mm. (3.55 inches) ; tail vertebrae 37 (^1.45) ' 

 ear from crown 17 (.67). 



Type locality, old Fort Tejon, California. 



Fringed Bats are known only from southern California and 

 northwestern Mexico. They appear to be common in the type 

 locality, where Dr. Merriam and Dr. Palmer found them hang- 

 ing in clusters from the rafters in the attic of an old building 

 forming part of tlie abandoned quarters of the old Post, in com- 

 pany with Yuma Bats. Young of various ages were found with 

 the adults July 5th, 1991. 



Genus Lasionycteris Peters. (Hairy — bat.) 



Skull flat ; rostrum broad ; face mostly bare and glandular ; 

 ears low, broad, widely separated; tragus short, broad, straight 

 in front, convex behind ; basal half of interfemoral membrane 

 furred on the upper side. 



Dental formula, I, 2 — 3 ; C. i — i ; P, 2—3 ; M, 3 — 3, X2=36. 



Lasionycteris noctivagans Le Conte. (Night — wan- 

 dering.) 



SILVERY-HAIRED BAT. 



Above and below blackish chocalate brown tipped witli sil- 

 very white. 



