NATURAL SCIENCES OF PHILADELPHIA. 63 



surrounded by a deep brown shade. Sometimes they are confluent and form a 

 longitudinal band ; the apices prolonged may form vertical bands. Head 

 brownish. Beneath greenish white. Total length 11 in. ; head and body 3 in. 

 6 lin. 



Hab. Honduras. Mus. Acad. Philadelphia. Dr. John L. Le Conte donor. 



Var. a, Wiegm. 



Sides with numerous short light bluish lines, imitating broken longitudinal 

 bands. Marginal supraoculars six, the third longest. Otherwise similar to the 

 ordinary variety. 



Hab. Vera Cruz, Mexico. Mus. Smithsonian. Dr. C. Sartorius donor. 



aa. Median gular scales but little larger than those surrounding. 

 b. Premaxillary teeth eight. 



A. guttata Cope. 



Cntmidophorus guttatus Wiegm., Herp. Mex. 29. Gray, Catal. Brit. Mus. 22. 



Supraorbitals three, the two posterior sometimes isolated by granular scales 

 in males; marginal supraorbitals six, the third very long. Nostril in the nasal 

 plate. Three occipitals, the median elongate. Postsymphyseal plate broader 

 than long. Three rows of plates upon the mesoptychium. Scales a little 

 larger than the intermandibular extend across the gular region. Three rows 

 of brachial plates continuous with two of antebrachials. Postbrachials mode- 

 rate, transverse. Femoral shields numerous ; pores twenty to twenty-three. 

 Three series of tibial plates, none of the external series disproportionately large. 

 Extremities of external and internal digits equal. Tail keels moderate. Brown- 

 ish olive above; upon the superior lateral region a narrow brown band bor- 

 dered above with lighter. Irregular short yellow lines or spots are distributed 

 more or less distinctly in four longitudinal series from nape to rump. Tail 

 unspotted. In the female the lateral brown band is scarcely margined with 

 paler above. Total length 14 in. 6 lin.; head and body 4 in. 9 lin. 



Hab. Vera Cruz, Mexico. Mus. Acad. Philadelphia. 



A. s a c k i i Cope. 



Cnemidophorus sackii Wiegm , Herp. Mex. p. 28. Gray, Catal. Brit. Mus. 22. 



Supraorbitals four, posterior minute; marginal scales eight, the anterior 

 three longer. Three occipitals. Three principal preanal plates. Femoral 

 pores twenty-two. Grayish olive ; sides olive brown, margined above with a 

 pale longitudinal band, transversely banded with blackish brown. A second 

 narrow lateral band extending from beneath the orbit to the posterior part of 

 the side. Total length 15 in. ; head and body 6 in. 



Hub. Mexico. 



bb. Premaxillary teeth six. 



A. t ffi n i u r a Cope. 



Supraorbitals three; the marginal five, second longest. Nostril pierced in 

 the nasal plate. Five occipitals. Plates of the mesoptychium numerous. Oae 

 Beries of brachial, two of antebrachial, scarcely continuous. Postbrachials 

 small. Four series of large femoral plates, bounded by smaller anteriorly and 

 posteriorly. Three tibial rows, two upon the inferior face of the limb ; the ex- 

 ternal composed of seven plates, the third very large. Larger preanals are two 

 transverse marginal, two or three longitudinal median. External digit extending 

 beyond the internal. Lateral tail plates smooth, superior keeled. Femoral pores 

 fifteen. Above brown. A narrow yellowish line extends from the superciliary 

 margin to a nearer or more distant point upon the tail. This is bordered above 

 by a black band, three times its width, which is sometimes faintly margined 

 above with yellowish. Sides black as far as a yellowish line which extends 

 from the superior border of the ear to the groin, and thence with increased 

 width for some distance upon the tail : on the latter region it is bounded below 



1862.] 



