20. PLESTIODON 591 



lateral on the adjacent edges of the third and fourth rows 

 of scales. The lower lateral stripe is only appreciable on 

 the neck. The extreme tip of the chin and sides of head 

 beneath are whitish ; the sides of the jaws are similar, but 

 the sides of the labials are dusky. The posterior labials 

 each have a large spot of white continued one anterior to and 

 another behind the ear. The upper lateral stripe is con- 

 tinued along the side of the upper surface of the head, but 

 the plates are not spotted. 



"This type of youngest coloration differs from that of 

 guttulatus in the presence of fine light lines instead of a 

 uniform black. The tip and sides of chin are entirely whitish, 

 with an occasional dusky spot, instead of having each plate 

 on the sides spotted sharply with white. The lower labials 

 are more continuously whitish, and the upper are white, 

 with the upper and lateral edges dusky, instead of having 

 each labial black with a central white spot. The posterior 

 upper labials, indeed, are spotted, and there is a spot anter- 

 ior to and one behind the ear, but no farther, neither are 

 there the spots on the sides of the head above, but, instead, 

 a faint continuous line. 



"1 have before me no such series of specimens as of 

 guttulatus, but one nearly as large as the type is distinctly 

 marked with nearly black lines on a light olive ground, the 

 upper labials distinctly spotted. There is a broad central 

 stripe of the light olive, occupying the adjacent two-thirds 

 of the two middle rows of scales. The upper edge of the 

 second row, however, is olive, this color interdigitating with 

 the black on the outside of second row. The adjacent edges 

 of the second and third rows of scales are brown. This is 

 followed by four light and three dark stripes. The most 

 conspicuous markings, however, are the four dark stripes on 

 4 2/2 rows of scales, the central third of the space being 



