398 SAURIA. 



either side approximating upon the interfemoral region without 

 being continuous. Olivaceous-grey or brown above, with a double 

 or quadruple series of black spots, posteriorly margined with white 

 or yellow ; beneath whitish or yellowish-white, generally unicolor, 

 occasionally speckled with jet-black. 



SYN. Agama douglatdi, BELL, in Trans. Linn. Soc. Lond. XVI (1828), 1833, 105. 

 PI. x. HARL. Med. & Phys. Research. 1835, 141. Fig. 3. 



Phrynosoma douylassii, WAOL. Naturl. Syst. Amph. 1830, 146. GRAY, Synops. 

 Kept, in Grif. Anim. Kingd. IX, 1831, 44 ; Catal. Liz. Brit. Mus. 1845, 227 ; &, 

 in Beech. Voy. to the Pacif. Zopl. 1839, 96. WIEOM. Herp. Mex. I, 1834, 54. 

 DCM. & BIBR. Erpet. gen. IV, 1837, 323. HOLBR. N. Amer. Herp. II, 1842, 101. 

 PI. xiv. FITZ. Syst. Kept. I, 1843, 78. GRD. in Stansb. Expl. Vail. Gr. Salt Lake, 

 Utah, 1852, 361 & 362. PI. vn, figs. 6-10. 



Phrynosoma ornatum, GRD. MSS. (accompanying Atlas.) 



OBSERV. As already observed (page 393), two species may yet be 

 confounded under this heading, one peculiar to the Northwest Coast, 

 the other to the Great Salt Lake Basin. The specimen figured be- 

 longs to the latter region ; and at the time the accompanying plate 

 was engraved, we thought we had found tangible characters to dis- 

 criminate them. All the specimens from the Northwest Coast are 

 much smaller than those of the more southern region of Utah; but, 

 since this fact might still be regarded by some as bearing upon the 

 climate, we have, so far, refrained recording them as distinct species. 



DESCR. The head itself is quite depressed, and the vertex but 

 slightly sloping towards a rather rounded snout. The temporal regions 

 are yet prominent, though the spiny processes contribute very little 

 towards their expansion. All the cephalic spines are sometimes so 

 much reduced in their development as to appear like mere knobs. 

 The upper labials are narrow and elongated, not larger, however, than 

 the supralabials, though much smaller than the temporal plates. The 

 cephalic plates are small and polygonal; their surface exhibiting a fine 

 meandric meshwork in relief. The scales under the head are very 

 small, subequal, and smooth. The submaxillar plates are moderate, ex- 

 teriorly ridged, thirteen in number, increasing in size posteriorly to the 

 tenth, whilst the three remaining ones are slightly smaller, ascending, 

 towards the angle of the mouth, to meet the lower labials. The latter 

 are quite narrow and small anteriorly, increasing in size posteriorly, 

 where the four last are nearly as large as the largest submaxillars. 



