49. scuLoporus.—5U. PHRYNOSOMA. 239 
Head-shields keeled or striated; two canthal scales; a series of 
five or six large transverse supraoculars ; occipital as long as broad ; 
parietals very small ; anterior border of ear very slightly denticulated. 
Sides of neck strongly plicate, minutely granular. Ten longitudinal 
rows of large, highly keeled, shortly mucronate dorsal scales, 
separated by many lateral series of minute flat scales from the 
smaller entire-edged ventrals ; forty scales between the occipital 
shield and the base of the tail; ten dorsal scales correspond to the 
length of the head. Tibia longer than the shielded part of the head. 
Thirteen or fourteen femoral pores. Tail long. General colour 
blackish above, with numerous indistinct lighter cross bars; or light 
brown with a double longitudinal series of transverse black spots and 
a yellow dorso-lateral band ; yellowish or greenish inferiorly. 
millim. millim 
Total length ...... 210 Fore limb ........ 30 
Head. eeu oud ee 15 Hind limb.. ..... 51 
BOG sae hing a gaees 53 PAI) Selves ae hasan ys 142 
Colima, Mexico. 
50. PHRYNOSOMA. 
Phrynosoma, Wiegm. Isis, 1828, p. 367, and Herp. Mex, p. 52; 
Wagler, Syst. Amph. p. 145; Dum. § Bibr. iv. p. 811; Litzing. 
Syst. Rept. p. 78; Gray, Cat. Liz. p. 227 ; Girard, U.S. Euplor. 
Exped., Herp. p. 388; Bocourt, Miss. Se. Mev., Rept. p. 281. 
Batrachosoma, Fitzing. lc. p. 79; Girard, 1. c. p. 400; Bocourt, 1. c. 
. 239. 
Whe dasa (non D. § B.), Fitzing. 1. ce. 
Anota, Hallow. Proc. Ac. Philad. 1852, p. 182; Bocourt, 1. c. p. 230. 
Tapaya (non Fitz.), Girard, lc. p. 894; Bocourt, 1. c. p. 220. 
Doliosaurus, Girard, 1. ¢. p. 407. 
Tympanum more or less distinct. Body depressed, without dorsal 
crest ; dorsal lepidosis heterogeneous, Head covered with small 
scales, bordered posteriorly by osseous spines. A transverse gular 
fold. Digits with keeled lamelle inferiorly. Femoral pores. Tail 
short. Lateral teeth subconical or indistinctly tricuspid ; no ptery- 
goid teeth. A large sternal fontanelle. No abdominal ribs. 
North America and Mexico. 
Synopsis of the Species. 
I. Nostrils pierced in the line of the canthus rostralis ; gular scales 
small, equal; a series of enlarged scales, parallel with, but not 
much larger than the lower labials. 
Head-spines very small, shorter than the 
diameter of the eye ........-...0055 1. douglassii, p. 240. 
Head-spines moderately large, the occipital 
spines measuring about the diameter of 
the eye; gular scales perfectly smooth.. 2. orbiculare, p, 241. 
