PLATE 21 
Dorsal views of the skulls of twelve species of California bats. All X 2. 
Fig. 24. Myotis californicus californicus, no. 18490, 9. 
Fig. 25. Myotis californicus pallidus, no. 17787, 2. 
Fig. 26. Myotis orinomus, no. 6941, 9. 
Fig. 27. Pipistreilus hesperus hesperus, no. 10409, g. 
Fig. 28. Myotis longicrus longicrus, no. 20811, 9. 
Fig. 29. Myotis yumanensis sociabilis, no. 6651, 2. 
Fig. 30. Myotis occultus, no. 10706, ¢. 
Fig. 31. Myotis lucifugus altipetens, no, 23036, 9. 
Fig. 32. Myotis velifer, no. 7762, 3. 
Fig. 33. Lasionycteris noctivagans, no. 24208, 9. 
Fig. 34. Myotis evotis, no. 6953, 9. 
Fig. 35. Myotis thysanodes, no. 29833 (U. 8. Nat. Mus.), 9. 
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