THE REPTILES OF OHIO 203 



plate in each specimen was included as a ventral and the spine at the tip of 

 the tail was included as a subcaudal. This is not standard practice. In the 

 making of counts upon recently collected serpents (and in older specimens 

 that have been restudied), these extra scales have been omitted, and all refer- 

 ences to the abdominal and subcaudal scutes ucon the pages that follov/ are in 

 accordanc: with generally accepted procedure. It should be borne in mind 

 that the statistics for ventrals and subcaudals in the first edition of this report 

 (pages 1 to 197, inclusive) are ail high by one unit. Thus, a ventral count 

 given as 212 actually should be 211; a subcaudal count of 77 should be 76, 

 etc. 



The "mean," where stated in the following pages, is the arithmetic mean 

 as defined by Simpson and Roe (1939, 85), and it is the equivalent of "aver- 

 age" as used in the original printing of the Reptiles of Ohio. 



Completely new distribution maps have been pr.pared. Information recent- 

 ly published by the Geological Survey of Ohio has necessitated a partial 

 redrawing of the base map.* On this, the physiographic boundaries have 

 been altered to conform with those shown on Maps 1 and 2 in the Geology of 

 Water in Ohio (Stout, Ver Steeg, and Lamb, 1943). Most of the changes 

 are relatively minor, but the line indicating the Allegheny Front Escarpment 

 (the eastern border of the Till Plains and the Blue Grass Region) has been 

 moved eastward and it no longer appears as a relatively smooth curve (see 

 maps on pages 269 to 279) ; this alteration results in an increase in the area 

 occupied by the Till Plains and a corresponding decrease in the Glaciated 

 Allegheny Plateau. The beach ridge of Lake Maumee, after running north- 

 ward for a short distance into Michigan, is now known to loop southward into 

 Fulton County, thus slightly reducing the territory occupied by the Lake 

 Plains. The glacial boundary, which has been worked out with greater accu- 

 racy, has been shifted slightly farther north and west in numerous places. 



Stout and Lamb (1938) ha.ve described a new physiographic boundary, the 

 Flashing Escarpment, which may or may not have some effect uDoia the 

 distribution of reptiles in Ohio. It is reoresentcd by an irregular line extend- 

 ing southward from Columbiana County to Monroe County, and it has been 

 drawn upon only three maps, those showing locality records for Sceloporus 

 undulatus hyacmthinus, Opheodrys verna'is, and Agkistrodon contortrix mok^- 

 son. In the cases of Sceloporus and Opheodrys there are records lying east- 

 ward of this escarpment, and these are at some considerable distances from the 

 nearest other Ohio records for the same species. f In the case of Agk'^trodon, 

 several records fill close to (and on both sids) of the line. Future collecting 

 may tend to fill in gaps in the Ohio ranges of these three species, but the pres- 

 ent status of cur knowledge of their distribution indicates that this physio- 

 graphic feature may possibly be of som.e significance. The Flushing Escarp- 

 ment, accor:'ing to Stout and Lamb (op. cit.), marks the boundary of an "old 



* Acknowledgement is gratefully made to the George F. Cram Compnny, of Indian- 

 apolis, for permission to use its outline map cf Ohio as th? base upcn which to develop 

 che m^ny distibuticn mrns rcccmpanying ih's report. 



t The general distribution pa'.tern of PscuJacri!< hrachyiphona in Ohio (Walker, 

 1946, fig. 20) is similar in many respects to that of Sceloporus undulatus hva.inlhums. 



