. Bulletin. Science; Natural history; Natural history. 128 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES Upper Incisor THOMOMYS t DIPODOMYS % in each size group • 1-10 • 11-30 • 31-50 #51-70 #71+ NEOTOMA #~-4-0 RATTUS #H>-n PEROGNATHUS PEROMYSCUS f-# X MIllllHl 17 18 19 20 21 22 23 24 26 28 f-f grooved inc. (16) (51) first molar—3 roots (19) first molar—5roots (5) 14 15 18 MICROTUS* f f f molars—serrated shaft (55) grooved inc. (35) MUS REITHRODONTOMYS 5 6 7 8. notched inc. 1 grooved inc. (23) DIAMETER OF INCISOR ARC in 1/32 Fig. 1. Key to upper incisors, with cranial characters as needed, of the
. Bulletin. Science; Natural history; Natural history. 128 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES Upper Incisor THOMOMYS t DIPODOMYS % in each size group • 1-10 • 11-30 • 31-50 #51-70 #71+ NEOTOMA #~-4-0 RATTUS #H>-n PEROGNATHUS PEROMYSCUS f-# X MIllllHl 17 18 19 20 21 22 23 24 26 28 f-f grooved inc. (16) (51) first molar—3 roots (19) first molar—5roots (5) 14 15 18 MICROTUS* f f f molars—serrated shaft (55) grooved inc. (35) MUS REITHRODONTOMYS 5 6 7 8. notched inc. 1 grooved inc. (23) DIAMETER OF INCISOR ARC in 1/32 Fig. 1. Key to upper incisors, with cranial characters as needed, of the rodents found in owl pellets from coastal sage scrub and urban/disturbed habitats of Southern California. Taxa represent Reithrodontomys megalotis, Mus musculus, Peromyscus sp., Perognathus sp., Microtus californi- cus, Rattus sp., Neotoma sp., Dipodomys agilis, and Thomomys bottae. Sample sizes are in paren- theses. Inc. = incisor. Lower Incisor THOMOMYS * T ? f ? ? T complex ang. near en. (42) NEOTOMA RATTUS «»-«h4-«»-i» first molar—2 roots (21) first molar-5 roots (5) MICROTUS DIPODOMYS T T ? m 28 3032 36 4044 ?-4 molars—serrated shaft (52) (10) 20 21 22 23 24 26 PEROMYSCUS MUS PEROGNATHUS f~t REITHRODONTOMYS n m '£7 (25) "(20) "u"cusp. molars (33) /^0 (20) condyloid '(en.) angular (ang.) 11 12 13 14 15 16 DIAMETER OF INCISOR ARC in 1/32" Fig. 2. Key to lower incisors, with mandibular characters added as Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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Keywords: ., bookcentury1900, booksubjectnaturalhistory, booksubjectscience
