62 PROCEEDINGS OF THE ACADEMY OF 



lines on each side; the superior from the superciliary margin, convergent on 

 the nuchal region; the inferior from the orbit, interrupted by the femur, con- 

 tinued on the base of the tail, bounded above and beneath by black. Inferior 

 lateral region black, greenish vermiculated. Back posteriorly varied with 

 black. Beneath greenish white. Total length 3 in. 4 lin. Body 1 in. 4 lin. 

 Hah. Nicaragua. Mus. Smithsonian. 



A. p u 1 c h r a Hallowell, Proc. Acad. Nat. Sci. Phila., 1860, p. 483. 



Three supraorbitals; six marginal supraorbitals, the second very long. 

 Lateral occipitals one on each side, bordered with irregular scales. Shields 

 of the mesoptychiura large. Brachial and antebrachial plates each in two rows, 

 the posterior of the former continuous with the anterior of the latter ; post- 

 brachials large. Twenty femoral pores. Three rows of plates on the tibia, 

 the inner not appearing on the inferior surface ; the outer composed of eight 

 transverse plates, the median three or four of nearly equal size. Preanal plates 

 in two longitudinal rows. Sole of the foot externally acutely tuberculous. 

 External digit not reaching to extremity of internal. On the rump broAvn : 

 proceeding anteriorly the shade of color becomes lighter, until upon the muzzle 

 it is ochraceous ; the whole is faintly tinged with olive. A deeper shade ex- 

 tends from the superior angle of the eye to above the groin, which is marked 

 by about twelve short, deep brown, vertical bands. These are bounded beneath 

 by a series of light dots which extend from the tympanum posteriorly. Sides 

 olivaceous; tail olivaceous, spotted with brown above. Total length 8 in. C lin. 



Jjab. Nicaragua. Mus. Smithsonian; Acad. Philadelphia. 



**Premaxillary teeth nine. 

 A. eutropia Cope. 



Three supraorbitals ; five marginal supraorbitals, the second very long. 

 Three occipitals, bounded posteriorly by many irregular shields. Infralabials 

 large, five on each side ; median gulars four or six, very large : a single row of 

 eight or ten large plates upon the mesoptychium. One series of brachial and 

 one of antebrachial shields, continuous with each other; postbrachials large. 

 One very large subround median anal, entirely surrounded by smaller plates. 

 Inferior femoral plates large, in three or four rows ; two rows of inferior tibials, 

 the external composed of six plates, of which the second is largest. Seventeen 

 to nineteen femoral pores. Digits strongly pectinate, the external equal to the 

 internal. Keels of the tail shields strong inferiorly as well as superiorly. 

 Above blackish brown with an olive tint. A blue-grey median band extends 

 from the occiput, and becomes broad and undulating in outline posteriorly 

 because of the dark shade which bounds it laterally becoming resolved into 

 spots. Two lateral narrow bluish gray lines, more or less interrupted, the 

 inferior reaching the groin. The median band in its prolongation to the muzzle 

 is light brown. Inferior surfaces light bluish green. Total length 1 1 in. 9 1. : 

 head and body 3 in. 9 1. 



jlab. Region of the Truando, New Grenada. Discovered by Arthur Schott. 

 of Lieut. N. Michler's Expedition. Mus. Smithsonian, (Nos. 4320, 4325.) Acad. 

 Philadelphia. 



A. undulata Gray, Catal. Liz. Brit. Mus. Dumeril, Catal. Method, pt. l,p. 113. 



Cnemidopkorun undulatus Wiegm., Herp. Mex. 27. 



Three supraorbitals; five marginal supraorbitals, the second very long. Oc- 

 cipitals three, succeeded by irregular thields. Large gular plates transverse. 

 Plates of the mesoptychium in two rows. Two rows of antebrachial, one of 

 brachial plates; postbrachial large. Five or six series of femoral plates; three 

 of tibial, the inner not visible from beneath. Preanals small, in two longitudinal 

 rows. Tubercles of ihe sole acute, outer digit not reaching extremity of inner. 

 Tail plates strongly keeled above and below. Twenty femoral pores. Olive brown 

 above vermiculated with brown posteriorly, bounded on each side by a series 

 of triangular light bluish spots, (their apices directed downward,) which are 



[Feb. 



