CROCODl LI AXS, LIZARDS, AND JiSAKES^. 



U05 



Fig. 315. 

 TRIMORIMlOnON irsiLox COl'K. 



Moxico. 



(■oUwIiKn of K. n, lVi«f. 



apper preoeular in t\>uraot with or narrowly sseivarated from the 

 frontal: two or three postooiilai-s : Temporals 2-f 2, 2 + ;>, or o+S; 

 eight or nine upper labials, fonrth and fitth entering the eye: five or 



six lower lalnals in contact with the anterior chin shiehls. whioh are 

 ion jrer than the posterior. Scales in twenty-one or twonry thnn^ rinv>. 

 Ventrals. 205-236; anal divided ; snbcaudals, 61-72. 



Pale grray-brown above, with dark, blaok edged crossbars narrowing 

 on the sides and descending to the ends of 

 the ventrals; head dark brown above, pale 

 grayish on the occipnt. usually with a light 

 crossbar between the eyes: a V-shaj>ed light 

 marking sometimes j) resent on the parietal 

 shields, embracing the frontal: whitish be 

 neath. more or less mottled with dark, and 

 with dark spots on the sides. In tlie young 

 the dark bars are much wider, sepaiated by 

 narrow whitish interspaces, and they may 

 form complete annnli. 



Measurements. — Total length, (iOOmm. ; tail. 

 120 mm. 



This species has not been found nearer our 

 political borders than the city of Chihuahua, 

 where Mr. Edward Wilkinson found it. He 

 also found it at Batopilas, in Chihuahua, 

 and Dr. Duges has sent it from Guauajuato. iMirthcr south. Ur. 

 Bernad sent it from Zacnaltipan (^Hidalgo) and Mv. Majov iVciu \u\\v 

 Guadalajara. 



TRIMORPHODON VILKINSONII Cope. 

 Trimorjyhodou rilkhixoiiii t'oi'K, rroo. Aiuoi. Phil. Soo.. lS8r>, p. l2Sr>. 



Scales in tweuty-three rows. Superior labials nine, of which the 

 fourth and fifth enter the orbit, and of which all are highci- tliau long, 

 excepting the fifth and the eighth. Loreals, 2; oculars, ;{-.?: icnipo- 

 rals, 3-3-3. Rostral not prominent, but the apex is i-ecurvcd on the 

 summit of the snout. Frontal plate rectangular, the lat«M-al and 

 anterior sides equal. Parietals narrowed posteriorly. Inferior hibials 

 eleven, the fifth in contact with progoneials, and none in contact with 

 postgeneials. Postgeueials much shorter tlian pregeneials. Gastro 

 steges, 231; anal, 1-1; urosteges, 77. The body is eompre.s.sed, and I lie 

 head is very distinct. 



Measurements.— Tot-dl length, 272 mm.; tail, 45 mm.; lu^ad loiicliis 

 oris, 9.2 mm. 



General color, gray; the back is crossed by narrow black cross bands 

 at rather remote intervals. These bands are pale l)ordered and nariow 

 to an apex below, which is above the gastrosteges. They become nar- 

 rower posteriorly, and on the tail form half rings. On the extremity of 



NAT MUS 98 70 



