52 CALIFORNIA ACADEMY OF SCIENCES. 



The ears are sparsely haired and the hair is very short, 

 in this respect much like L. alleni. The fringe on the 

 anterior edge is dark gray, short and fine in texture. 

 The tips of ears are black, the black extending down the 

 posterior edge of the convex side for nearly one -half its 

 length. 



This species is based upon three specimens, all fully 

 adult, collected by Samuel C. Lunt and John M. Stowell 

 during June and July, 1893, in the San Pedro Martir 

 Mountains, Lower California, at an altitude of about 7,000 

 or 8,000 feet. 



Four other specimens were seen by the party but not 

 secured, all in the vicinity of La Grulla, a large timber- 

 inclosed meadow-tract, watered by mountain streams. 

 Tracks were seen in several other places upon the mount- 

 ains, but we did not start the animals from their hiding 

 places and concluded that they must secrete themselves 

 in the crevices among the huge rocks which are heaped 

 up so numerously. 



The San Pedro Martir Mountains form a range about 

 70 miles in length, their eastern slope passing into the 

 deserts surrounding the Gulf of California, their western 

 face so abrupt and precipitous as to admit of ascent at 

 two points only: one from Agua Caliente, near the ex- 

 treme northern end of the range, and the other sixty miles 

 to the south, where the mountains are a barren waste in- 

 habited only by mountain sheep. 



Between Agua Caliente and Cape Colnett one passes 

 over a series of mesas and low ridges, where jack-rabbits 

 occur. Two of these were seen by us, though not secured, 

 at San Telmo, and were easily recognized as different 

 from those upon the mountains. The difference is well 

 known also to the natives, who recognized our specimens 

 at once, distinguishing them from the lowland form by 

 their lars^e ears and dark coloration. 



