104 PROCEEDINGS OF THE ACADEMY OP 



similar band on the posterior face of the limb. A median light stripe be- 

 tween these two. Two paler median dorsal bands which diverge on the nape, 

 and are frequently united for most of their length. Beneath iridescent rose- 

 color, deeper posteriorly, becoming brownish vermillion on the under surface 

 of the tail. 



Habitat. Cape St. Lucas. From coll. of Jno. Xantus, Esq., (No. 5290). 

 A species allied to the d e p p ei Wiegm. in scutellation ; the latter has two 

 frontoparietals three supraoculars, is stouter, and more numerously banded. 



Cnemidophorus rnaximus Cope, sp. nov. 



Plates of the collar graduating in the posterior gular, the marginal largest, 

 the series concave anteriorly in the middle. Anterior gulars abruptly larger, 

 their median largest. Nostril in naso-rostral ; supraorbitals four, fronto- 

 parietals separated. Interoccipital (in adult) nearly as broad as long ; oc- 

 cipitals large. Preanals in four transverse series, the posterior two containing 

 six. Tibials four, femorals seven, abdominals eight, antebrachials (often an 

 unreliable character) four, brachials seven rowed. Dorsal scales minute. 



Length from end of muzzle to gular fold 4" ; from gular fold to vent 8" ; 

 from vent to end of tail 22 // . 



Above olive brown, with three brown bands on each side, which are as wide 

 as the intervals between them, and are so broken by spots of the ground- 

 color as to resemble series of confluent brown variations. Posterior extremities 

 coarsely reticulate with the same color. Superior surface of tail, and gular 

 region, blackish, varied ; abdominal shields black tipped. Under surface of 

 tail and hinder extremities yellow. 



Habitat. Cape St. Lucas. Jno. Xantus. (Smith. Mus., No. 529T). 



Differs from the C. grahamii, its nearest ally, in its smaller and more 

 numerous preanal plates, much smaller dorsal scales, and broader light 

 bands. 



Cnemidophorus melanostethus Cope, sp. nov. 



Plates of the collar small, the marginal not the largest ; posterior gulars 

 graduating into the anterior, not abruptly separated from them; the median 

 of the latter not abruptly larger than those around them. Nostril in the 

 frontonasal plate, as in all other North American species. Four supraorbitals, 

 two frontoparietals ; interparietal elongate. Sides of neck with many folds. 

 Scales of the back flat, rather large. Five large anals, two of which are mar- 

 ginal. Hind foot entering length of head and body three times ; extended, 

 reaching angle of the mouth. Eight series of abdominal scales. Length 

 from muzzle to collar 3" ; collar to vent 6", 3 /// ; vent to end of tail 27". 



Above olive brown, with numerous whitish spots arranged closely in 

 irregular transverse series, producing a reticulate aspect. Thorax and ter- 

 minal two-thirds of tail, black ; abdomen slightly, gular region strongly 

 shaded with the same. 



Habitat. Region of the Colorado of California. Mus. Smithsonian, 

 (3064 a) ; obtained by Mr. H. B. Mollhausen, of Lieut. J. C. Ives' expedition 

 which explored that river. 



This species has a shorter hind foot than the gracilis, (where it enters 

 the length of the head and body two and a half times,) and does not exhibit 

 that abrupt transition from the small posterior to the large anterior gular 

 plates. The latter character separates it from tesselatus and tigris. 

 In the former of these the dorsal scales are larger ; in the last, the coloration 

 is very different. 



Uta thalassina Cope, sp. nov. 



Form much depressed. Median dorsal scales larger, smooth, graduating 

 into the lateral, smaller than those of the abdomen, not separated by median 

 smaller ones. Abdominal scales nearly rectangular, in transverse series. 

 Brachial scales a little larger, more imbricate, keeled. Occipital plate large, 



[April, 



