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By THIES MONTE L

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Extra resources for A Key to the Skulls of North American Mammals

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49. Podomys Greatest length of skull 30mm Fig. 50. Cricetus* Greatest length of skull 45mm 35 -Lateral margins of rostrum not parallel ....................................................................... 48 48. -Anterior cusp of M 1 aligned with outer (labial) row of cusps; skull 25mm or more in length ............................................. Onychomys (Fig. Baiomys (Fig. 53) 49. -M 1 and M 2 with middle loop undivided, extending completely across tooth; supraorbital and temporal ridges present; cranium not constricted abruptly in interorbital region; dorsal border of infraorbital canal emarginate; teeth rooted .........................................................

Prema){illaries e){tending well forward below and in front of narial aperture; 11 large and curved inward, 12 minute, 13 curved out and resembling a canine; rostrum long and slender; canines and first three premolars separated from adjacent teeth by spaces appro){imately eciual to their own diameters; auditory bullae incompletely formed; posterior border of palate anterior 3 to M ; foramen magnum about twice as long as wide when seen from below ....................................................................

63) ....... 60 -M3 with two loops and two median triangles .............................................................. 65 60. -M3 with 3 or more (usually 3) closed triangles ........................................................... 61 3 -M with 2 closed triangles ........................................................................................... 64 61. -Skull narrow and elongate; sagittal crest prominent ................................ (Stenocranius) -Skull not so narrow and elongate, condylobasal length less than twice zygomatic breadth; sagittal crest weak or absent ......................................................................................................................

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