PLATE 14 
Fig. 1. Portion of Colorado Desert near Toro, Riverside County, showing 
entrance to cave occupied by colony of California leaf-nosed bats (Macrotus 
californicus). This eave and other similar ones in the vicinity also inhabited 
by bats were formed by wave action at the margin of the ancient Blake 
Sea. From these day-time retreats the bats issue forth at late dusk for 
nocturnal foraging over the adjacent desert. 
Fig. 2. View in attic at home of R. B. Herron, Colton, San Bernardino 
County, showing clusters of Mexican free-tailed bats (Nyctinomus mexicanus) 
crowded together under the ridgepole in the peak of the roof. At the time 
of the observer’s visit these bats were continually crowding and _ jostling 
each other in an apparent effort to squeeze still farther into the crevices. 
Other bunches of bats of the same species were seen in different parts of the 
garret, and at evening as the bats left this retreat through a slatted ventilator 
at the gable end, 1609 were counted. The photograph here reproduced was 
taken on October 27, 1916. Mr. Herron states that in midsummer the colony 
is much larger, including, he thinks, about 5000 individuals. Flashlight 
photograph by J. R. Pemberton. 
Fig. 3. Station in the Transition life-zone near Fyffe, Eldorado County, 
with an incense cedar in foreground and yellow pines in background. Species 
of bats collected here July 19-31, 1916, were: Lasionycteris noctivagans, Myotis 
californicus californicus, Myotis longicrus longicrus, Myotis lucifugus altipetens, 
Myotis thysanodes, Eptesicus fuscus, and Pipistrellus hesperus merriami. This 
photograph shows an ideal collecting site, a tongue of cleared land projecting into 
a forested area. 
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