SCELOPORUS. 73 
femoral pores. Brownish or greenish, marbled with lighter and darker; collar-folds 
black, sometimes a black collar on the throat, but never on the neck. Male with the 
throat and the sides of the abdomen blue, the middle of the abdomen being black with 
a greenish median band, or in very old specimens entirely black. 
An adult male specimen is 24 inches long without tail. 
21. Sceloporus couchii. 
Sceloporus couchit, Baird, Proc. Ac. N. Sc. Phil. x. p. 254. 
Hab. Nortu America, Texas, Duval Co. (W. Taylor).—Mextico, Sta. Catarina in Nuevo 
Leon (Couch, U.S. Nat. Mus.). 
Seventy scales in a series along the middle of the back; dorsal scales not mucronate, 
in series converging towards the median line. A row of large supraoculars. Hind 
limb longer than the distance of the vent from the collar; length of the fourth toe 
equal to the distance of the shoulder from the end of the snout. Eighteen femoral 
pores. A light greenish, sometimes interrupted, longitudinal band on each side of the 
back; back more or less distinctly spotted; a black spot in front of the shoulder; 
sides with light greenish spots. Male with the abdomen whitish, blue on the sides, 
and with the jaws and throat ornamented with oblique convergent blue bands. 
An adult male is 24 inches long without tail. 
B. The two series of femoral pores meeting in front of the vent. 
22. Sceloporus scalaris. 
Sceloporus scalaris, Wiegm. Isis, 1828, p. 370; and Herp. Mex. p. 50, t. 8. fig. 2; Bocourt, Miss. 
Se. Mex., Rept. p. 202, t. 18 bis. figg. 9,9.a, 6; Cope, Proc. Am. Phil. Soc. 1885, pp. 388, 394; 
Boul. Cat. Liz. ii. p. 234. 
Tropidolepis scalaris, Gray, in Beechey’s Voy., Zool. p. 95, t. 80. fig. 8. 
Hab. NorrH America, 8.W. Texas.—Muexico, Sonora (U.S. Nat. Mus.), Monterey, 
Zacualtipan in Hidalgo (Cope), Jalisco, north of the Rio Santiago (Richardson), 
Colima (Dugés), Cuernavaca (Méhédin, Mus. Paris), city of Mexico, Atlixco (Mus. 
Brit.), Hacienda del Bobo (Geddes), Orizaba (Sumichrast), Cozumel I. (U.S. Fish 
Commission). 
Thirty-two scales in a series along the middle of the back; dorsal scales keeled, 
pointed. Supraoculars small, without a distinct series of large ones. Length of the 
hind limb much less than the distance between the vent and collar; length of the 
fourth toe equal to, or even a little more than, that of the head. From sixteen to 
nineteen femoral pores on each side, the two rows meeting in the median line. Olive 
or light brownish, with a yellow line on each side of the back ; a series of large blackish 
halfmoon-shaped spots (with the convex side directed backwards) on each side of the 
yellow lateral line. No collar. A black spot in front of the shoulder, entering the 
BIOL. CENTR.-AMER., Rept., February 1890. *10 
