1915.] NATURAL SCIENCES OF PHILADELPHIA. 129 



show in the least the typical compression which distinguishes that 

 subspecies. In coloration these two specimens apparently agree 

 with U. S. Nat. Mus. Cat., No. 10,581, which Cope said restrained 

 him "from regarding the form compressus as a distinct species." 

 It is, nevertheless, interesting to note the gradation, since it makes 

 these forms from the swamp seem to stand between the typical 

 ventraUs and its unique subspecies, the standing of which may be 

 subject to question. 



The largest of the three specimens is quite distinct in color and 

 form, although found in exactly the same locality, and may be 

 briefly characterized as follows: 



Body very stout and thick; dark brown above with many small 

 white spots irregularly placed on the head, and in more or less regular 

 longitudinal and transverse rows or lines on the dorsal surface of 

 the body and tail, giving the whole a checkered appearance. The 

 stripes are obsolete. Under surface of body sordid yellow-white; 

 the tail clear lemon-yellow beneath. There is but one interfronto- 

 nasal, and the superior labials do not touch the orbit. Superior 

 labials ten in number. Length 525 mm., maximum width 20 mm., 

 length to vent 265 mm. 



13. Cnemidophorus sexlineatus Linn. Plate II, fig. 2. 



Apparently common throughout the islands of the swamp. Cer- 

 tainly one of the most common lizards on Billy's Island. Also 

 numerous on Honey Island and Minne Lake Islands. This lizard, 

 in spite of its swiftness, was easier to secure in the field than the 

 other common species on account of the fact that it did not possess 

 the disconcerting habit of dashing along fences and through the 

 underbrush. 



It is locally known as the "race-nag," a name which, like many 

 of the other names used by the inhabitants of the swamp, was 

 strikingly descriptive, since the lizard is so remarkably active and 

 scurries over the ground with surprising speed when disturbed. 

 It appeared most abundantly in the plowed fields where the Lees 

 had planted corn, peas and goobers, and since these plowed fields 

 are very sandy, the common name of "sand lizard or swift" is quite 

 appropriate. They were commonly seen among the "goober" 

 vines where their colors blended well with the lights and shadows 

 under the leaves. These lizards seemed to prefer the bare furrows 

 for sunning themselves, and in the raised earth between the furrows 

 iiad dug their holes, into which they darted when disturbed. These 

 burrows extended in irregular directions to a depth of 8 or 10 inches, 

 9 



