. Bulletin - American Museum of Natural History. Natural history; Science. 224 Bulletin American Museum of Natural History. [Vol. VII,. Fig. 13. Neotoma floridana. Lower molar series, three time:; natural size. Fig. 14. Neotoma floridana. Left lower molar series, three times natural size. Fig. 15. Neotoma micropus. Left lower molar series, three times natural size. Fig. 16. now the form of a flat-topped or trun- cated cone. In the corresponding molar of the opposite side there is a tendency to the same condition. (See Fig. 13.) Another specimen (No. jf|i> ? ao"., Gainesville, Fla.) has
. Bulletin - American Museum of Natural History. Natural history; Science. 224 Bulletin American Museum of Natural History. [Vol. VII,. Fig. 13. Neotoma floridana. Lower molar series, three time:; natural size. Fig. 14. Neotoma floridana. Left lower molar series, three times natural size. Fig. 15. Neotoma micropus. Left lower molar series, three times natural size. Fig. 16. now the form of a flat-topped or trun- cated cone. In the corresponding molar of the opposite side there is a tendency to the same condition. (See Fig. 13.) Another specimen (No. jf|i> ? ao"., Gainesville, Fla.) has a well-developed angle at the antero-internal border of the posterior loop of M5 (Fig. 14). In still another specimen (No. £§-§§, 6 ad., Han- cock Co., Miss.) a well-defined angle is developed at the antero-external border of the anterior loop of M5, A similar variation is seen in a speci- men of jV. micropus (No. |-f§|-, $ ad., Rockport, Texas, Fig. 15). Less marked variations are not infrequent in N. flori- dana, N. micropus and N. mexicaua, as already noted in regard to the latter. In AT. cinerea occidentalis this aberration is frequently well marked, as shown in No. f°§§ (Fig- *6), in comparison with No- T45TT (Fig- T7)- Fig. 17 may be con- sidered as representing the more usual or normal form. While these variations are in the main to be regarded as abnormal, they indicate tendencies to a more varied tooth-pattern, past or to come. 22. Onychomys torridus Coues. Arizona Scorpion Mouse. To this species are referred 43 specimens, collected mostly within about 50 miles of the type locality (Camp Grant, Arizona), as fol- lows : 26 specimens from Fairbank, Feb. 21 to March 14 (Price and Condit) ; 14 from Camp Lowell, Jan. 19 and March 8 to April 18 (Price and Miller); 3 from San Bernardino Ranch, March 27 and 31 and May 1 (H. ('. Condit); and 1 from Phoenix, Dec 10 (J. Diefen- Fig. 17. Fit;s. 16 and 17. Neotoma cinerea occidentalis. Left lower molar series, three times
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