162 bulletin: museum of comparative zoology. 



ones strongly keeled and separated from the lower labials by four rows 

 of small scales; from the nuchal fold along the median line of the 

 body a series of low spines which is much reduced between the shoul- 

 ders, nearly interrupted on the rump; fifty spines on the back between 

 these two points; upper surface of the limbs with slightly imbricated, 

 keeled, posteriorly pointed scales, somewhat larger than the dorsals; 

 on the lower arm about seven, on the tibia about five to the vertical 

 diameter of the tympanum ; a single series of about seventeen femoral 

 pores; inner side of second toe with one " comb" of third toe with two 

 combs each consisting of three main and two smaller lobes; tail 

 covered with faintly indicated verticils; tail surmounted by a crest of 

 heavy spines, a trifle larger than the back spine. 



Coloration: — The color of both specimens is very faded, but it 

 was probably uniform olive-gray in life, perhaps slightly more yellow- 

 ish on the head and under surface. 



Material examined. 

 The specimens described. 



Cyclura nigerrima Cope. 

 Plate 11; Plate 15, fig. 1, 2. 

 Cope, Amer. nat., 1885, 19, p. 1006. 



Diagyiosis: — Very similar to C. cornuta from which it may be dis- 

 tinguished by the following characters: — 



Nasals separated from the rostral by two rows of scales, one of the 

 rows of very large scales. Nasals separated from each other by three, 

 and in part by four rows of scales. Prefrontals separated from the 

 large median frontal scales by two rows of scales. Supraorbital semi- 

 circles not apparent but this may be due to the old age of the speci- 

 men. Precanthal scale as large or a trifle larger than canthal scale, 

 both subrectangular or squarish. Dorsal crest low, interrupted on 

 both shoulders and rump, forty-nine spines in the crest between these 

 two points. Verticils similar to those of C. cornuta but very indis- 

 tinct, the bulge not very prominent. Color indeterminable through 

 fading, but probably not unlike that of C. cornuta. 



Habitat: — Navassa Island. 



