CROCODILIAXS, LIZARDS, AND SNAKES. 



433 



median equal to or longer tliau the posterior oue; all directed outwurd 

 at an angle of 45 degrees. The series does not extend to below the 

 orbit. Occipital horns moderate, acute, well separated, slightly diver- 

 gent, and directed 4:') degrees upward. Scales of front and vertex 

 rugose, three conic scales posterior to the occipital, the posterior a 

 median occipital. A row of conic scales connecting posterior super- 

 ciliary angles in front of ])arietal. Infialabials iiromineut and acute 

 l)osteriorly, the last equal to or longer than the first temi)oral. Oue 

 row of enlarged gulars. No subrictal si)ine. On each side of the pos- 

 terior gular border a small spine. Two longitudinal folds on the side of 



I'ltKYNOSOMA CORNUl'UM UaKI.AN. 



X S. 



West Texas. 



C.il. No. -l:!,'..'!, r.S.N.M. 



the neck, several spinous scales on the inferior and longer, and one on 

 the superior and shorter. Below the inferior an oblique series descends 

 forward to the plane of the enlarged guhirs. 



Dorsal scales larger, flat, and keeled medially, graduating to smaller 

 ones laterally. A row of large, flat, keeled scales on each side of the 

 vertebral line. External to these, on each side, about four series of 

 enlarged keeled scales, with free apices directed posteriorly, and situ- 

 ated at considerable intervals. The scales of the internal row are con- 

 siderably larger than those of the external. Gular scales small, 

 rounded, sometimes keeled. Ventrals weakly keeled or smooth. Sui)e- 

 rior surface of humerus and cubitus covered with large keeled and 

 mucronate scales, Avith very few small ones intermixed. Femur and 

 tibia covered above with smaller keeled scales, with a few large spiuous 

 scales intermixed. Large keeled scales of humerus extended across 

 the clavicular ridge. Two rows of spinous scales on each side, the 

 NAT MUS 98 :JS 



