i 



MENOBRANCHUS LATERALIS. 117 



variety, if not a distinct species; it is more slender in proportion — its colour and 

 markings are different — it is found only in the western waters that run into the 

 Mississippi, while the former inhabits the rivers and streams that flow into the 

 northern lakes and all the tributaries of the St. Lawrence river. 



Reptiles known to inhabit the United States, but which I have never been 

 able to procure. 



Ameiva tessellata. Say. Long's Exped. to Rocky ]Mount., vol. ii. p. 50. 



"Characters. Above black, marked with nine or ten longitudinal lines, and 

 eighteen or twenty transverse ones, dividing the whole surface in a tessellated 

 manner, the lines being brownish on the back, yellowish on the sides; scales of 

 the back small, convex and rounded; beneath bluish-white; throat and neck yellow- 

 ish; head olivaceous, covered with plates; scales on the throat somewhat larger 

 than those on the back; anterior feet yellowish within, covered with minute 

 scales; on the exterior and posterior sides greenish-white, with confluent black 

 spots and minute scales; the anterior side yellowish, with larger scales; ])ores of 

 the thighs very distinct and prominent; tail elongated, brownish above, spotted 

 with black near the base; beneath, impure white, immaculate; the scales carinated 

 and placed in transverse series. Length, one foot; tail, eight and a half inches. 

 Inhabits Arkansas Territory." Dr. Harlan thinks this animal may prove the 

 Ameiva sexlineata, which can hardly be, as Say must have been well acquainted 

 with the latter animal; and besides, their colour and markings are entirely 

 different. 



Vol. v.— 16 



