150 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
and rump; 56 spines between these two points. Color above brown- 
ish green, tinged on the head, shoulders and along the mid line of the 
back with pale yellowish green. 
Habitat:— Andros Island, Bahamas. 
The most abundant species still existing in the Bahamas. 
Description:— Adult male, M. C. Z., 6979, Andros Island, Bahamas, 
1904, Harvard Bahama Expedition of 1904. 
Rostral as wide as the mental, broadly in contact with the nasals, 
nasal large, ovoid, and perforated in the posterior half by a somewhat 
semicircular nostril; each nasal in contact with a rectangular supra- 
nasal and a slightly larger, triangular postnasal; nasals and supra- 
nasals broadly in contact in the middle of the snout; each supranasal 
in contact with a pair of narrow prefrontals which are followed by a 
very large posterior prefrontal; the anterior and posterior prefrontals 
form a median suture continuous with the nasal and supranasal suture; 
all of these scutes covering the upper surface of the snout strongly 
convex, even tubercular; between the prefrontals and the supraorbital 
semicircles several rows of large irregular scales; the row in contact 
with the prefrontals consisting of several very large scales, the largest 
being about a third as large as the posterior prefrontal; between the 
semicircles on a line with the anterior end a single large flat scale; the 
semicircles formed of large tubercular seales clearly differentiated from 
the slightly swollen scales of the supraorbital or frontal regions; 
supraorbitals roughly hexagonal and uniform in size; supraorbital 
semicircles separated by two, partly by four rows of scales, occipital 
located with its posterior end on a line with the posterior end of the 
semicircles; scales of the occipital region slightly larger than the 
frontals, the outer row of occipitals much larger than the others; 
two rows of scales between the occipital and the semicircles; two or 
three rows of superciliaries, a single large canthal scale and a short 
squarish precanthal on each side; canthal scale in contact with two 
elongate superciliaries, the whole series swollen and slightly keeled; 
a well-developed series of strongly keeled suboculars continued back- 
ward as a supratympanic series; eight supralabials to the middle of the 
eye, a series of three or four rows of small scales separating the supra- 
labials from the suboculars; on the anterior edge of the ear three 
enlarged tubercular scales, preceded by a group of smaller ones, the 
larger one of which is located above the angle of the mouth near the 
ear; below the angle of the mouth a regular series of tubercular scales 
decreasing in size anteriorly; seven infralabials to the middle of the 
eye; a single row of very large, swollen malar scales; the two anterior 
ones in contact with the supralabials, the rest separated by a single 
