SCELOPORUS OCCIDENTALIS. 383 



2. SCELOPORUS OCCIDENTALIS, B. & G. 

 (Plate XIX, figs. 8-14.) 



CHAR. SPEC. Scutis cephaUcis rujosis ; scuto anteparietali scuto verticis 

 fere aequali ; loreuli uno vel duobus, subaequalibus. Squamis tempo- 

 ralibus minimis, carinatis, acuminatis ; praeanalibus modicis, postioe 

 rotundis, subemarginatis ; postanalibus minimis, laevibus, subtrunca- 

 tis, subemarginatis. femorum facie posteriori squamis minutissimis, 

 lanceolatis, et carinatis, cooperta. Corpore supra fusco, cum dorsuali 

 et laterali serie macularum n'ujrarum et postice albo marginatarum, 

 quae series vittd clard, interdum interruptd, separantur. 



SPEC. CHAR. Cephalic plates rugose ; anterior parietal nearly equal 

 to the vertex plate. One or two unequal lorals. Temporal scales 

 small, keeled, and acuminated. Preanal scales moderate, poste- 

 riorly rounded, subemarginated ; postanals small, smooth, subtrun- 

 cated, subemarginated. Posterior aspect of thighs covered with 

 minute, lanceolated, and keeled scales. Coloration : various shades 

 of brown above, with a dorsal and a lateral series of black, poste- 

 riorly white-edged spots, separated by a light, sometimes interrupted, 

 streak. 



STN. Sceloporus occidental is, B. & G. in Proc. Acad. Nat. Sci. Philad. VI, 1852, 

 175. 



DESCR. The general form and proportions of the body and limbs 

 are pretty much the same as in S. undulatus. The head, however, is 

 more depressed. Differences in the cephalic plates are made apparent 

 by figs. 10 & 17, of Plate xix. Without dwelling too much upon 

 the vertex and occipital plates, which we have found varying within 

 certain proportions, we will allude more particularly to the supraocu- 

 lars, which are not subjected to any variations, as far, at least, as our 

 observations of the latter extend. We notice two subcrescentic series 

 of them, the outermost being composed of very small and narrow plates, 

 longer than broad, whilst the other series consists of six transversely 

 dilated and quite large plates, hence, broader than long. Between 

 the latter and the supraciliary ridge, there are two more parallel 

 series of small plates. The mental shields constitute a longer series 



