Sp BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Diagnosis. Nasals broadly in contact with the rostral. Prefrontal 
region covered by a pair of elongate supranasals, broadly in contact 
with the middle line of the snout, immediately followed by two pairs 
of prefrontals and a fifth scale which is intercalated at the crossing 
point of the sutures, the posterior pair several times as large as the 
anterior pair; both pairs of prefrontals broadly in contact in the middle 
line of the snout. Frontal region covered by a transverse row of four 
large scales in contact with the prefrontals and by two more large 
scales mesially arranged and separated from the transverse row by 
a single row of small scales. Supraorbital semicircles not apparent, 
but the scales of the supraocular region much smaller than those of 
the frontoparietal regions. Canthus rostralis consisting of a very 
elongate canthal scale preceded by a small precanthal; all these scales 
on the top of head very slightly swollen, some searcely keeled. Dorsal 
crest consisting of very low blunt spines, the largest scarcely three 
millimeters high, this crest greatly diminished but not interrupted 
on the shoulders, widely interrupted, however, on the rump, sixty 
spines from shoulder to rump. Color above grayish brown sprinkled 
very slightly with yellowish gray; spinal region tinged with straw 
color; sides of the snout blackish; gular region chalky white in strong 
contrast to the rest of the ventral surface. 
Habitat— U. Cay in Allen’s Harbor, Highborn Cay, Bahamas. 
Probably now extinct. 
Description of Type.— Rostral as wide as the mental, broadly in 
contact with the nasals; nasal large, somewhat ovoid, perforated by a 
large ovoid nostril; each nasal in contact with an elongate supra- 
nasal and a triangular postnasal; nasals barely, supranasals broadly 
in contact in the middle line of the snout; supranasals immediately 
followed by two pairs of prefrontals and a fifth scale incalated at the 
crossing point of the sutures; the posterior pair several times as large 
as the anterior pair; both pairs of prefrontals broadly in contact in 
the middle line; no definite supraorbital semicircles; scales of the 
supraocular region much smaller than those of the frontal region; in 
contact with the prefrontals a transverse row of 4 large scales; sepa- 
rated from this row by a single row of small scales two more large scales 
mesially arranged, occipital located well forward and flanked on 
either side by a group of scales larger than those of the frontal region; 
frontal region covered by scales somewhat larger than those of the 
occipital region; two or three rows of superciliary shields not clearly 
differentiated; canthal scale very elongated, preceded by a small 
prefrontal, all these scales of the top of head very slightly swollen, , 
