6 University of Michigan 



The more useful features for the separation of these races 

 are emljodied in the following synopsis of the fasciata group : 



a^ Dorsal saddles on body about ii to i" 



Xafrix fasciata conflnens Blanchard. 



(Eastern Louisiana north to southeastern IMissouri, eastern and 

 southern Arkansas, and west in Texas to al^out the 98th meri- 

 dian). 



a^ Dorsal saddles on body about 20 to 2i^. 



b Dorsal saddles on body commonly about 24: ventral plates us- 

 ually more than 128; belly often with dark quadrate spots; 

 often small lateral spots alternating with the dorsal saddles. 



Natrxx fasciata fasciata (Linne) . 



(Northern Florida and the coastal regions from North Carolina 

 to southeastern Louisiana.) 



b.. Dorsal saddles on body commonly about 29: ventrals usually 

 less than 128; belly with dark, sometimes reddish, anterior 

 borders on the ventral scales ; often reddish markings with 

 black edges particularly on the ends of the ventrals ; no small 



lateral alternating spots Xatrix fasciata picfii'cntris Cope. 



(Peninsular Florida.) 



ACKNOWLEDGMKNTS 



The writer's appreciation for loans of specimens used in 

 this study, and for other courtesies, is cordially extended to 

 Professor A. G. Ruthven of the Museum of Zoology of the 

 University of Michigan, to Dr. Leonhard Stejneger of the 

 United States National Museum, to Dr. Thomas l]arl)our of 

 the Museum of Comparative Zoology, to Dr. John Van Den- 

 hurgh of the California Academy of Sciences, to ^Ir. E. D. 

 lUmker of the Kansas University Museum, to Mr. II. P. Pod- 

 ing of Mobile, Alabama, and to Mr. Percy Viosca, Jr.. of New 

 r)rleans. 



