36 NOETH AMEEICAN FAUNA. [No. 37. . 



Cranial measurements of the Marmota monax group — Continued. 



No. 



Species and locality. 



Sex. 



Condylo-basal length, j 



Palatal length. 



Postpalatal length. 



Length of nasals. 



Zygomatic breadth. 



Breadth across mas- 

 toids. 



Least interorbital 

 breadth. 



Breadth of rostrum. 



Maxillary tooth row. 



Remarks, 





Marmota monux petrensis. 



























203532 



Revelstoke, British Columbia — 







86 



50.3 



31.8 



32.5 



57.4 



42 



23 



18.6 



20 



Adult; type. 



101295 



Barkerville, British Columbia . . 



9 





79 



46.5 



29.5 



32.4 



53.2 



36 



19.4 



17.6 



18.8 



Adult. 





Marmota monax ochracea. 



























202785 



Babine Mountains, British Co- 































[J?] 



81.2 



48 



30 



33.4 



52.7 



39.8 



19.8 



17.2 



20 



Subadult. 



77143 



Stuart Lake, British Columbia. . 







80.6 



47.6 



29.5 30.6 



55.6 



38.2 



20.6 



18.8 



19 



Adult. 



77141 



do..... 



[c?? 





80.2 



47.3 



30.5 32.4 





38.1 



19.8 



17.2 



17.6 



Do. 



77137 



do 



[9? 





76.5 



45 



28.9 



32.4 



52" 



36.7 



22 



16.8 



18.6 



Do. 



77140 



do 



[9? 





77.1 



45.4 



29.3 



31.4 



51.3^36.2 



19.6 



17.4 





Do. 



Marmota flaviventris Group. 



[Characters under species.] 

 MARMOTA FLAVIVENTRIS (Audubon & Bachman). 

 (Synonymy under subspecies.) 



External characters. — Size variable (small to medium) ; ^ tail rela- 

 tively long (about 25 to 30 per cent of total length); ears small; sole 

 pads as in the monax group (see PI. Ill, fig. 2) ; mammae: P. f ; A. f ; 

 1. 1= 10; head usually with white markings between eyes (absent or 

 reduced in ohscura) ; sides of neck with conspicuous buffy patches ; 

 feet varying from light buff to hazel or dark brown (never black) ; 

 tail mixed hazel and dark brown (fading to clay color) . 



Cranial cliaracters. — Skull similar in general outline to that of 

 monax; interorbital region relatively narrower; postorbital processes 

 longer and slenderer, projecting slightly back of a line drawn across 

 their bases at right angles to axis of skull; nasals decidedly narrowed 

 posteriorly, where their width is equal to or less than that of nasal 

 branches of premaxillae ; temporal ridges usually united in old age to 

 form a well-defined but rather low sagittal crest; floor of basi-occipital 

 with a median subcircular depression, bounded laterally by two low 

 processes which converge and unite into a ridge near the inferior lip of 

 the foramen magnum; posterior border of palate beveled at an ob- 

 tuse angle; interpterygoid fossa relatively narrow; palatal foramina 

 usually contracted posteriorly or of equal width throughout; molar 

 teeth light; maxillary tooth rows slightly divergent anteriorly; ante- 

 rior face of incisors yellowish white to zinc orange. 



1 Two adult male specimens of M. flaviventris nosophora weighed, respectively, 10 and 12 pounds; two 

 adult males of M. flaviventris dacota, 8 and 17 pounds, the latter being very fat. 



