114 



BULLETIN Gl^ UNITED STATES NATIONAL MUSEUM. 



The western and southern Hniits are not delinitely known. This 

 is due in laro;e part to tlie want of specimens from the regioii^t>f these 

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

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

 and western Kentucky, Tennessee, and Mississippi (fig;. 45). 



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

 sauritus have been examined it mioht seem that a considerable amount 



Fig. 45.— Distribution of Tuamnopiiis sauritus, as indicated by 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. 



