ggg S A U R I A. 



LOG. This species was collected about Puget Sound, Oregon. 



Plate XIX, fig. 1, represents a profile view of the male sex of Scelo 

 porus frontalls, size of life. 



Fig. 2, is an under view of the same individual. 



Fig. 3, the head, seen from above ; 



Fig. 4, a front view of the head. 



Fig. 5, the left hand, viewed from above. 



Fig. 6, a group of dorsal scales ; 



Fig. 7, a group of abdominal scales. 



Figs. 3-7, are somewhat magnified, to bring out the details more 

 conspicuously. 



4. SCELOPORUS GRACILIS, B. & G. 

 (Plate XX, figs. 1-9.) 



CHAR. SPEC. Scuds ceplialicis laevibus. Scuto anteparietali quam ver- 

 ticis majori; scutis postparietalibus in dua paria ordinatis. Scuto 

 'occipitali mediano amplissimo, pentagonali. Scutis latero-occipitalibus 

 minimis, in dua paria dispositis; loreis duobus ; supralabialibus 

 in duplicem seriem ordinatis; mentaUum quatuor paribus. Squamis 

 postanalibus magnis, sublanceolatis, laevibus, postice emarginatix. 

 Femorum facie posteriori squamis minimis, rotundis, et laevibus, 

 cooperta. Supra fusco-olivaceo, cum duabus seriebus macularum 

 nigrarum crescentiformibus, et duabus vittis claris in lateribus, inter 

 quas punctorum nigrorum series invenitur. Infra flavescente ; facie 

 inferiori capitis caeruleo nebulata. Mare macula caerulea elongata 

 in utroque abdominis latere notato. 



SPEC. CHAR. Cephalic plates smooth. Anterior parietal larger than 

 the vertex plate ; two pairs of postparietals. Middle occipital very 

 large, pentagonal. Two pairs of small latero-occipitals. Two lorals. 

 Two series of supralabials. Four pairs of mental shields. Postanal 

 scales large, sublanceolated, smooth, posteriorly notched. Posterior 

 aspect of thighs covered with small, rounded, and smooth scales. Oli- 

 vaceous-brown above, with a double series of crescent-shaped black 

 spots on the back, and two lateral light streaks, in the intervening 



