148 APPENDIX A. 



abdomen and the 9th or 10th rows of scales, and are about one and 

 a half scales long, separated by intervals of 2 1 or 3 s(^ales. The dark 

 bars crossing the back obliquely, and connecting the alternating bars 

 of opposite sides by their decussation and slight confluence, form the 

 dorsal series of blotches. These lines are about half the width of the 

 vertical bars, appearing like their bifurcations. They divide the 

 back into a succession of transversely elongated hexagons of the 

 ground-color. The dark markings are confined to the skin and the 

 basal halves of the scales, the tips of these in all cases being of the 

 ground-color. Beneath yellowish white, blotched along each side 

 with darker. 



Collected by Dr. S. W. Woodhouse, on the Arkansas river and its 

 tributaries, near the northern boundary of the Creek nation, and in 

 possession of the Topographical Bureau. 

 Arkansas River. 141+1. 70. 27. Dr. S. W. Woodhouse. 



RiTcrodia. frasisversa, B. & G. 



Stn. Tropidonotus iransversus. Hallow. Proc. Acad. Nat. Sc. Pliilad. VI, 

 1852, 177. 



Owing to the imperfect condition of the specimen upon which this 

 species was founded, it has been impossible to determine its true af- 

 finities (except the generic), although strongly suspecting it to be the 

 same, or at least very similar to JSF. Woodhousii, B. & Gr. If they be 

 the same, the name of Dr. Hallowell will of course have priority, 

 although neither the description nor the present condition of the spe- 

 cimen afford conclusive proof on this point. Dr. Hallowell's descrip- 

 tion is as follows : — " Head large, swollen at the temples, convex 

 posteriorly, flattened between the orbits, depressed in front ; a series 

 of subquadrate dark-colored blotches, thirty-six or thirty-seven in 

 number, along the back ; a transverse row of oblong bars along the 

 sides, their upper margins alternating with the inferior margins of 

 the dorsal blotches ; scales strongly carinated, 23 rows ; abdominal 

 scutellas 144 ; subcaudal 78. 



"Dimensions. Length of head 12 lines; greatest breadth 7; 

 length of body 1 ft. (Fr.) 5 inches, 7 lines; length of tail 6 inches; 

 total length 2 ft. 



" Hahitat. Creek boundary, found near the banks of the Arkan- 

 sas and its tributaries." 



Topographical Bureau. 



