408 SAURIA. 



ing a name, as on the present occasion. Still, it will easily be under- 

 stood how the adoption of a generic name, recalling to the mind a trait 

 of organization which is not generical, could have had a sufficient 

 weight in counterbalancing the reluctancy just alluded to. 



1. DOLIOSAURUS MC'CALLI, Grd. 



Spec. Char.— Cephalic plates moderate. Occipital spines rather elon- 

 gated and slender. Submaxillar shields very large : posterior ones 

 spinous. No external auricular aperture. Mental scales very 

 small, subequal, with two distant longitudinal series of somewhat 

 larger ones. Pectoral scales large, carinated, and acuminated. A 

 triple series of subpyramidal scales at the periphery of the abdo- 

 men ; middle one alone well developed. Abdominal scales small, 

 slightly carinated. Femoral pores extending somewhat over the 

 interfemoral region, though the series from either side are not con- 

 tinuous. Yellowish-olive above, with a dorsal black line, and a 

 double series of rounded spots on either side of the back, uniting 

 into one along the tail ; whitish-yellow beneath, unicolor. 



Syn. — Aiiota mc'caUu, Hallow, in Proc. Acad. Nat. Sci. Philad. VI, 1852, 182 ; &, 

 in Siigr, Rep. Exped. Zuni and Color. Rivers, 1853, 127. PL x. 



• 



Observ. — The back is densely covered with small, irregular, and 

 keeled scales, Avith interspersed larger ones, and which are somewhat 

 depressed : hence, its appearance is rather smooth than rough. The 

 pyramidal scales at the periphery of the abdomen, together with 

 those that are observed on either side of the tail, are the only asperi- 

 ties observed in this species. The occipital spines are but slightly 

 higher than the temporal ones, with which they constitute a semi- 

 circle, and upon which they are disposed somewhat apart. Two of 

 the temporal spines, on either side, are rather well developed, slender 

 and acute, though shorter than the occipital ones. The submaxillar 

 shields are larger than in any other species of the same group. The 

 two mental series of scales, which are more developed than the rest, 

 extend along the middle of their respective side, being, therefore, 

 twice as far apart upon the medial region as their distance from the 

 submaxillar shields. The scales upon the anterior aspect of the chest 



