CROCODILIANS, LIZARDS, AND SNAKES. 



647 



In a siuglo very youug specimen (Cat. No. 3113), head and body 

 thirty-four millimeters long, I find what I consider the very young stage 

 of this species. The distance from the centers of insertion of the fore to 

 that of tiie hind leg is one and one-half times that from the former to the 

 snout. The hind leg applied forward twice, reaches a little more than 

 halfway from arm to ear, and is contained two and two-thirds times in 

 the head and body. The hind leg from knee is contained three and 

 one-half times in the head and body. The fore leg fi^om elbow is about 

 equal to the head. The fifth hind toe is decidedly shorter than the 

 second, the free portion of longest toe barely exceeding half the side of 

 head. The head is broad, depressed. The color is an intense black, 

 rather bluish beneath. There are five excessively faint, slender, whitish 

 lines, a median dorsal, an upper lateral on the adjacent edges of the 



Fig. 128. 



EUMECES OBSOLETUS BaIED AND GiRABD. 



Arizona. 



Cat. No. 14776, U.S.N.M. 



third and fourth rows of scales. The lower lateral stripe is only appre- 

 ciable on the ue(;k. 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 continued along the side of the upper surface of the 

 head, but the ])lates are not s])<)tted. 



This type of youngest coloration ditfers from that oi </uttuIatus 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 shari)ly 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 



