CROCODILIANS, LIZARDS, AND SNAKES. 575 



blocks. The lateral abdominal plates are black at the base, leaving a 

 light stripe below the inferior black one, not well defined below. This 

 gives the appeaiance of fonr light stripes on each side instead of three. 

 Four black spots between orbit and ear, and a few on i)osterior labials 

 and front of orbit. Legs strii)ed and reticnlate with black on a i»ale 

 ground. I add that there are ID femoral i)ores, and that the extended 

 hind leg reaches the front border of the auricular meatus. 



This form approximates this subspecies to the C. t. iessellaius. The 

 habitat of the s[)ecimen is unknown. 



CNEMIDOPHORUS TESSELLATUS TESSELLATUS Say.' 



Cnemidophorns te^scllatux Baird, U. S. Pac. R. R. Siirv., X, 1859, Gunuiaou's Kept., 



p. 18. — Cope, Check List 15atr. Rept. X. Aiuer., p. 46. 

 Ameiva tesselJata Say, Long's Exped. Rocky Mts., II, 1823, p. 50. 

 Cnemidophorns gracilis Baiud and Gikard, Proc. Acad. Nat. ScL. Phila., 1852, p. 



128.— Baird, U. S. Mex. Bound. Surv. Rept. II, Pt. 2, Reptiles, p. 10, 



pi. XXXIV, figs. 7-14. 

 Cnemidopliorus marmoratus Baird and Girari>, Proc. Acad. Nat. Sci. Phila., 1852, 



p. 128. 

 Cnemidophorus tigris Baird and Girard, Proc. Acad. Nat. Sci. Pliila., VI, 1852, 



p. 69.— Baird, U. S. Mex. Bound. Surv. Rept., 1859, II, Pt. 2, Reptiles, p. 10, 



pi. XXXllI. 

 Cnevddopliorus fessellatiis tigris Copk, Check List Batr. Rept. N. Anier., 1875, p. 46. 

 Cnemidophorns undulatus Hallowell, Proc. Acad. N^at. Sci. Phila., VII, 1854, 



p. 94. 



The scale characters of this subspecies are much like those of the 

 C. t. perplexus. The interparietal i)late is generally laiger, exceeding 

 the parietals, and being nearly as wide in front as it is long. The first 

 pair of infralabials is separated by scales ])Osteriorly. The larger scales 

 of the mesoptychium extend all the way across it, and they are pre- 

 ceded by a considerable tract of small scales, which are in turn pre- 

 ceded by the large gulars rather abruptly. The brachial scales are in 

 four rows and the antebrachials in three. The feniorals are in seven 

 (rarely six or eight) and the tibials in three. Femoral pores from 19 

 to 21, The hind limb extended, reaches the tympanic meatus with 

 the end of the longest toe. The anal plates are four to six in number — 

 two posterior and two arranged anteroposteriorly in front of them. 



Measurements. — Tolal length, 335 mm.; length of head and body to 

 vent, lOli mm.; length of head to angle of mandible, -0 mm.; length to 

 collar, 35 mm.; length to axilla, 42 mm.; length of foreleg, 34 mm.; 

 length of forefoot, 1<> mm.; length of hind leg, 73 mm.; length of hind 

 foot, 37 mm. 



The adult differs from the young in color, and its colors may be best 

 understood by reference to the latter. In this stage the ground color 

 of the back and sides is black or blackish olive, and it is traversed by 

 two light-yellowish stripes on each side. One of these starts at the 

 occipital plate and the other at the superciliary angle. The lateral 



Description liom a speciuKMi tVoni tlie Cauyou of the Arkansas, Colorado 



