114 



BULLETIN 61, UNITED STATES NATIONAL MUSEUM. 



The western and southern Hmits are not definitely known. This 

 is due in large part to the want of specimens from the region qf these 

 boundaries. As will be shown later, however, the western limit 

 may probably be given in general as the Indiana-Illinois boundary 

 and western Kentuck}^, Tennessee, and Mississippi (fig. 45). 



Variation. — From the list of localities from which specimens of 

 sauritus have been examined it might seem that a considerable amount 



^v^; 'r^-^->rr:^r 



^j* * * «y^\^v * « * 





1 \ y^i\ 





Fig. 45.— Distribution of Tiiamnopiiis sauritus, as indicated isy the locality records. 



of material was available for the study of this form. Unfortunately, 

 however, none of these localities are represented by more than about 

 a dozen specimens, the usual number being one to four. Even after 

 combining the records from neighboring localities, the data is still 

 insufficient to denote more than general conditions. 



As in the case of sackeni, the dorsal scale formula in no specimen 

 examined departs from 19-17." The labial formula, on the other 



a Compare p. 35. 



