49. scELOPORrs. — 5o. phrtkosoma. 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 infcriorly. 



millim. iiiillim. 



Total length 210 Fore limb 30 



Head 15 Hind limb 51 



Body 53 Tail 142 



Colima, Mexico. 



50. PHRYNOSOMA. 



Phrynosoiua, IVier/m. Isis, 1828, p. 307, and Herp. Mex. p. 52; 



Wagler, Syst. Amph. p. 145; Dum. S,' Bibr. iv. p. 311 ; Fitzing. 



St/st. Rcpt. p. 78 ; Gray, Caf. Liz. p. 227 ; Girurd, U.S. E.vplur. 



E.rped., Herp. p. ?>88-, Bocourt, Misti. Sc. Mex., Rept. p. 231. 

 Batrachosoma, Fitzing. I. c. p. 79 ; Girard, I. c. p. 400 ; Bocourt, I. c. 



p. 239. 

 TropiJogaster {no72 D. i.^- B.), Fitzing. I. c. 



Anota, Hallow. Proc. Ac. Philad. l8o2, p. 1S2 ; Bocourt, l. c. p. 230. 

 Tapaya {no?i Fitz.), Girard, I. c. p. 394; Bocourt, I. c. p. 220. 

 Doliosaiu'us, Girard, I. c. 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 lamellae interiorly. Femoral pores. Tail 

 short. Lateral teeth subconical or indistinctly tricuspid ; no j)tery- 

 goid teeth. A largo sternal fontanelle. No abdominal ribs. 



North America and Mexico. 



Synopsis of the Species. 



I. Nostrils pierced in the line of the can thus 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 1. douglassii, p. 240. 



Head-spines moderately large, the occipital 



si)ines measuring about the diameter of 



the eye ; gular scales perfectly smooth . . 2. orhiculave, i). 2-i\.' 



