392 REPORT OF NATIONAL MUSEUM, ISflS. 



at tlie base, where tlioy nre of the same dimensions. Tibia not quite so 

 long- as the shielded part of the head. The femoral pores, less distinct 

 in the female, number seventeen to eighteen under each thigh, and 

 almost merge together at the interfemoral region. 



Measurements. — Total length of specimen, 104 mm.; length of upper 

 surface of head, 9 mm.; length of head at the level of the temples, 

 85 mm.; length of body from chin to anus, 44 mm.; length of tail, 

 60 mm.; length of tibia, 9 mm. 



Ul^per surfaces of the body olive green, mixed with a- coppery reddish 

 brown; two indistinct bands extend along each side of the body; 

 between each two there are traces of black dots. Lower surfaces bright 

 yellow. 



Says Bocourt: "Wiegmann's type of this species is a female of small size, resem- 

 bling Sceloporus scalaris in the following particulars : (1) arrangement of siipra- 

 cepbalic ])lates; (2) scales on the sides have the cariua' directed backward, forming 

 bj' contact longitudinal lines jiarallel to those of the dorsal scales ; (3) femoral i)ores 

 merge together in the interfemoral region. There are some details, however, of no 

 great specific value, which distinguish Sceloporus aneiis from its relatives; head and 

 limbs relatively short; scales of the upper jiart of the body rather large, and the 

 coloration differs markedly in some respects." 



According to Duges, the Sceloporus wneus is characteristic of the 

 Texcocan district of the plateau. He records it from Guanajuato, 

 Silos, Tupataro, Lamora, and Chilcota. 



SCELOPORUS GRAMMICUS Wiegmann. 



Sceloporus (jrammicus Wiegmann, Isis, 1828, p. 370; Herpet. Mex., 1834, -p. 51. — 

 FiTziNGER, Syst. Rept., 18<13, p. 76.— Bocoukt, Miss. Sc. Mex., Rept., 1874, 

 p. 192, pi. xviii bis, fig. 12,— Cope, Proc. Am. Phil. Soc, XXII, 1885, p. 395. 



Sceloporus 2)leurosi ictus Wiegmann, Isis, 1828, p. 370. 



Trojndolcpus grammicus A. Ditmekil, Cat. M6th. Coll. Rept., 1831, p. 77. — Gkay, 

 Grifi'. Cuv. Auim. King., IX, Syn., 1831, p. 43.— Dumkril and Bibron, IV, 

 1837, p. 308; Cat. Liz. Brit. Mus., 1st ed., 1845, p. 209. 



Sceloporus heferurus Coi'E, Proc. Acad. Nat. Sci. Phila., 1866, j). 322. 



Head shields smooth or slightly rugose, anterior frontal not divided; 

 a series of feebly dilated transverse supraoculars, a series of large 

 scales external to them; two canthal scales; occipital a little broader 

 than long; parietals very small, usually one pair on each side; ante- 

 rior border of ear leebly denticulated. Dorsal scales larger than veu- 

 trals, strongly keeled, not, or but slightly, mucronate, not serrate, in 

 forty-five transverse rows between interscapular and sacral regions, 

 forming oblique series; forty-five to fifty scales between the occipital 

 shield and the base of the tail ; twelve to fifteen scales correspond to the 

 length of the shielded part of the head; lateral scales keeled, directed 

 obliquely upward, gradually merging into the dorsals and ventrals; 

 latter smooth, mostly entire; forty-six to fifty scales round the middle 

 of the body. Caudal scales much lai-ger than dorsals, with elevated 

 keels, continued as ridges, in eighteen longitudinal rows, eight lines 



