SCELOPORUS. 65 
the neck smaller than those on the back. The large supraoculars not divided. Hind 
limb equal to the distance of the vent from the collar; fourth toe rather longer than 
the head. Femoral pores fifteen. Green or greenish-bronze coloured, without trans- 
verse collar on the neck ; a large black patch on the collar-fold of the side of the neck, 
the two patches being connected by a black band across the throat. Young males have 
the abdomen blue, yellowish grey in the middle, the colours separated from each 
other by black. In very old males the light colour in the middle disappears, and the 
whole abdomen is uniform blackish blue. In an adult male each dorsal scale is black, 
with a broad green band, also the upperside of the head is symmetrically spotted with 
green. 
Size of adult male 3 inches without tail. 
Cope (/. c.) says that he has seen a specimen from Tehuantepec; but as this indi- 
vidual has a double row of supraoculars, the locality is not inserted here. 
83. Sceloporus poinsetti. 
Sceloporus poinsettii, Baird & Gir. Proc. Ac. N. Sc. Phil. vi. p. 126; and in U.S. & Mex. Bound. 
Surv., Rept. p. 5, t. 29. figg. 1-3. 
Hab. Norra America, Texas.—Mexico, Rio San Pedro and Sonora (Clark), Ciudad 
in Durango (Forrer). 
Twenty-one or twenty-two scales in a series along the back. The large supraoculars 
divided into a double series. Hind limb equal to the distance of the vent from the 
humeral joint; fourth toe as long as the head. Femoral pores eleven or twelve. 
Scales on the neck not conspicuously smaller than those of the back. A broad black 
collar edged with light green across the neck; body and tail with alternate dark and 
greenish cross-bands, the darker bands being the broader. Lower parts blue and black 
in the adult male, a whitish band along the middle of the abdomen. 
Size of adult male 4 inches without tail. 
The coloration of the upper parts is probably not constant. 
4. Sceloporus acanthinus. 
Sceloporus acanthinus, Bocourt, Miss. Sc. Mex., Rept. p. 180, t. 18. figg. 10, 10 a, b, & t. 19. 
figg. 4, 4a; Boul. Cat. Liz. ii. p. 221. 
Hab. Mexico, Jalapa (Hége); Guatemata, San Agustin on the Volcan de Atitlan 
(Mus. Paris). 
Twenty-four scales along the back. The large supraoculars not divided. Hind limb 
equal to the distance of the vent from the humeral joint; fourth toe longer than the 
head. From twelve to fourteen femoral pores. Anterior nuchal scales much smaller 
than those on the back. <A narrow black collar only one or two scales broad across 
the neck. 
BIOL. CENTR.-AMER., Rept., February 1890. *9 
