CROCODILIANS, LIZARDS, AND SNAKES. 341 



a. Lateral scalos mucli smaller than dorsal. Scales all very minute. A short, 

 wliitish line to the shoulder perpendicular to the lateral stripe. No black 

 collar. 

 Plates of head corrugated. Scales on sides mostly in distinct oblique serial 

 arrangement. Oblique dorsal rows of scales about seventy. Femoral pores 

 twelve, 

 riatcs of head wrinkled ; anterior frontal divided ; scales small, in sixty to eighty 

 cross series between occiput and tail; lateral scales much smaller than dor- 

 sal, sharply detined from them. 

 Brown above, with generally a pale, longitudinal band on each side; throat 



and sides of belly blue, pale in the center in males S. variabilis. 



Plates of head smooth. Scales on sides mostly paved and granular. Oblique 

 rows of scales above eighty. Femoral pores twenty. 

 Dark green above, with two lateral light stripes, separated by eighteen rows of 

 scales. Back with irregular spots. Sides with a white band from groin. 

 An obsolete patch on each side the belly, widely separated below. Sides of 

 jaws transversely banded with blue and whitish, this arrangement extend- 

 ing on sides of chin ^- oouchii. 



acx. Lateral scales not miuute; a black collar. 



Plates of head smooth ; dorsal scales in forty rows from head, very weakly keeled, 



not mucronate; femoral pores fifteen. 



Bluish black above, the scales with a light center ; a black collar, light bordered 



before and behind, connected with a dark, longitudinal band on the side of 



the head S.jarrovii. 



SCELOPORUS DUGESII Bocourt. 



Sceloporus dugesii Bocourt, Mission Sci. Mex. Kept., 1874, p. 188, pi. xviii, fig. 7.— 

 Cope, Proc. Amer. Phil. Soc, XXII, 1885, p. 396.— Boulknger, Cat. Liz. Brit. 

 Mu8.72d ed., II, 1885, p. 224. 

 Sceleporus intermedins A. DuGi^s, La Naturaleza, Mexique, IV, 1876, p. 29, pi. I, 

 figs. 21-32. 

 A rather large species with the body depressed. Upper cephalic 

 plates smooth. Two scutella on the upper border of each angular ridge 

 of the muzzle. Supraocular scales relatively small, a very little wider 

 than long. On the anterior edge of the auricular border are flat 

 scales a little wider than those in front. Scales on the back of average 

 dimensions, obtuse, and feebly carinated; nine to twelve of these scales 

 equal the length of the upper surface of the head. Scales on the flanks 

 just a little smaller; those of the belly one-third smaller than those of 

 the back. Tail covered with scales much larger than those on the back. 

 Thirteen to tifteen femoral pores. Upper part of the body shaded from 

 olive to dark umber, with a brown scapular collar border on the front 

 edge witli yellow. The males have the breast yellow and the sides of 

 the abdomen blue. 



Head relatively short, depressed, and wide through the temples; its 

 length is a little less than oue-tifth the distance from the chin to the 

 anus. Seven polygonal prefrontal plates, the two anterior ones being 

 much smaller than the others; two froutal plates; the first, rather large, 

 is wide in front and slightly concave; the second is smaller, hexagonal, 

 and is in contact at the posterior angle with the anterior angle of the 

 occipital plate. This, in turn, somewhat larger, is narrow in front, having 

 the lateral borders parallel, and is in contact, right and left, with a 



