992 



REPORT OF NATIONAL MUSEUM, 1898. 



lowish baud extends forward, passing under the head to the extremity 

 of the snout. A black line is seen running from behind the neck to the 

 anus, affecting the extremity of the scutellse, and occasionally the lower 

 edge of the outer row of scales. The abdomen is uniform light straw 

 color; a medial nebulous blackish band under the tail is observable. 

 In other specimens there is a median row of small black spots on the 

 belly, one on the basal part of each gastrostege. Or there maybe still 

 more rarely two such rows forming two bands. This is the case with 

 large specimens. In the young there is a median pale dorsal band one 



Fig. 264. 



NaTRIX GRAHA>ni BAIRI) and (llRARD. 

 = 1. 



Northern Illinois. 



Ciit. No. 1400, U.S.N. M. 



and two half scales wide, which has a narrow black border. There is 

 also a black superior border to the lateral yellow stripe. From a speci- 

 men of this kind the species was originally described. These dorsal 

 bands and stripes soon disappear, small specimens being often without 

 them. The type specimen is also abnormal in having three postocular 

 plates, being the only one presenting such a peculiarity in the large 

 series in the U. S. National Museum. 



Cat. Nos. 



Gasirosteges. TJrosteges. Length. Tail. 



12942 155 + 1 51. 



12956.- 163 + 1 53. 



13040..' 136+1 ? 



1376 161 + 1 57. 



mm. 

 692. 



mm. 

 110. 



Xatrix grahamii Baird and Girard. 



Catalogue 

 No. 



1376 



749 

 7214 



Number 



of apeci- 



uiens. 



Locality. 



Rio Salado, Texas. 



Northern Illinois 



New Orlean.s, Louisiana , 



Cliicaiio, Illinois , 



Northern Illinois , 



When 

 collected. 



From whom received. 



Col. J. D. Graham, U. S. 



A. 

 Lieutenant Couch.U.S. A 



11. Kennicott . 

 do 



Nature of 

 specimen. 



Alcoholic 

 type, 

 do. 

 do. 

 do. 

 do. 



