NATURAL SCIENCES OP PHILADELPHIA. 177 



in considerable abundance with U. stansburiana and thalassina. U. 

 bicarinata Las been described by Prof. Dum6ril as typical of his genus 

 Phymatolepis ; it cannot be separated from Uta. His Sauromalus is also Eu- 

 phryne of Baird. 



Sceloporus utiformis. 



Ten longitudinal rows of large, highly keeled, shortly mucronate dorsal 

 scales, separated by many lateral series of minute flat scales, from the smaller 

 entire edged abdominals. From axilla to ear the laterals are granular; a der- 

 mal fold extends to temporal from scapular region, and sends branches to a V- 

 shaped fold, which extends downwards and backwards from the posterior bor- 

 der of the large auricular opening. Six (seven) rows of shortly highly keeled 

 scales on nape ; from which point to rump are about 26 transverse series. Gu- 

 lar scales entire ; three moderate infralabials. Six rather short supraorbitals, 

 separated from marginals by three rows of small scales. Interparietal as broad 

 as long, subrectangular, with two parietals on each side. Frontoparietals not 

 subdivided transversely, as is usual, but subdivided longitudinally to frontal ; 

 latter a little longer than broad; first row between canthi of three broad plates 

 fully in contact. Profile arched, muzzle prominent, narrow. Thirteen femoral 

 pores. Tail cylindrical, long. From end of muzzle to ear 7} 1. ; from ear to 

 vent 2 in. 1 1. ; vent to end of tail 5 in. 7 1. ; anterior limb 1 in. 2 1. ; posterior 

 limb 2 in. ; hind foot 111. 



General co'.or blackish, with numerous indistinct lighter cross bars. Below 

 pale greenish grey ; gular region greenish, with narrow light cross lines. 



Hab. Near Colima, Mexico. Obtained by John Xantus, U. S. Consul at 

 Manzanillo. 



A species technically nearest to the S. couchii, which exhibits much 

 smaller dorsal scales, and approaching the genus Uta in its scutellation. 



Sceloporus pyrocephalus. 



Dorsal scales much larger than ventral, strongly keeled, unimucronate ; in 

 about twenty-five transverse oblique series fiom nape to crural region. Lateral 

 scales larger than abdominal ; of the latter a portion only slightly emarginate. 

 Scales from ear to shoulder squamous; those of ear fringe a little larger than 

 those anterior to them. Tail much compressed. Femoral pores twelve. Su- 

 praorbitals five, transverse, in immediate contact with narrow marginals, not 

 touching superciliaries. Frontoparietal narrow ; frontal broader than long, 

 not divided. Parietals exceedingly small ; interparietal large, much broader 

 than long. Frontonasals two each side broader than long ; posterior in con- 

 tact; anterior embracing broad hexagonal internasal. Infralabials small, ex- 

 cept the anterior pair, which is large and extensively in contact. From end 

 of muzzle to ear 6 lines ; ear to vent 1 inch 9 lines; length of anterior limb 11. 

 lines ; of hinder limb 1 inch 5 lines ; of hinder foot 7 lines. 



Greenish brown, with a broad black band from the scapular region to the 

 groin, light bordered above. Below yellowish, sides bluish ash to near the 

 median line, on each side of which is a series of from seven to nine trans- 

 verse blue bars. Upper labial and gular region striped with a series of black 

 or bluish lines, which converge posteriorly on a paler or deeper yellow ground 

 Top of the bead bright chestnut red ; the fontanelle white or pink, surround- 

 ed by a pale area. In many specimens, especially females, the head is browu 

 above, except the parietal spot. 



Ilab. Near Colima, Mexico ; obtained by Jno. Xantus, U. S. Consul at 

 Manzanillo, where it is abundant. Collection Nos. 1223, 1311. This small spe- 

 cies may be known from the th ay e r i by the extension outward of its supra- 

 orbitals, and small size of its parietals, as well as by coloration, and its re- 

 markably compressed tail. 



Sceloporus oligoporus. 



Dorsal scales large, mucronate. in twenty rows from interscapular to sacral 



1864.] 12 



