682 REPORT OF NATIONAL MUSEUM, 1902. 



verse row (postgeneials); 249 rings on the body and 16 on the tail; the 

 segments square, slightly longer than broad on the back, the 6 median 

 rows on the abdomen broader than long, especially the middle pair; 

 16 above and 16 below the lateral line; anal shields or segments, 6; 

 preanal pores, 4. Color light flesh, with a brownish spot in the center 

 of each segment, rather indistinct, especially on the lower surface. 



Dimensions. 



mm. 



Tip of snout to vent 260 



Tail 18 



Diameter of body 9 



Variation. — Apart from a slight oscillation in the relative length of 

 the sutures on the head the variability is insignificant. As in A. caeca, 

 the occipitals appear most subject to variation, but they seem to be 

 longer than broad, as a rule, even in the clearly abnormal specimen 

 (No. 25537) as shown in tig. 134. The number of rings varies only 



Figs. 134-137.— Amphisb.ena bakeei. 2i x natural size. 134, top of head; 135, sideof head; 136, under- 

 side of head; 137, anal region. No. 25537, U. S. N. M. 



between 249 and 251 in the three specimens at hand, but more specimens 

 will undoubtedly show a greater range, though probably not more than 

 a difference of ten, as in A. cseca. 



The ventral segments vary between 16 and 18 in our specimens, but 

 otherwise the scale formula is constant. The eye is plainly visible in 

 No. 27458. 



Habitat. — Apparently confined to Porto Rico. The only definite 

 locality whence we have specimens is Lares, where Mr. A. B. Baker 

 collected two specimens. A third one was sent by Mr. Charles E. 

 Adams from Porto Rico without any record as to the place where it 

 was actually taken. 



Remark*. — In addition to the characters pointed out in the key and 

 diagnosis, this interesting- novelty differs from A. c&ca in several 

 other points, the constancy of which, however, must remain doubtful 

 till more specimens can be examined. Such are the elongation and 

 broad contact of the occipitals and the lighter color, but the other 

 characters, as demonstrated by the great uniformity in the large series 

 of A. cwca, are sufficient to distinguish A. hakeri. 



