210 APPENDIX F. REPTILES. 



Fig. 6. The side of the head enlarged, to show more distinctly the 

 structure of its plates. 



Fig. 1. Head from above, enlarged in the same proportion as fig. 6. 



Fig. 8. Head from below, enlarged. 



Fig. 9. The right arm and fingers, seen from below. 



Fig. 10. The right leg and toes, seen from below. 



Fig. 11. Dorsal scales, enlarged four times. 



Fig. 12. Scales from the belly, slightly enlarged. 



V. CNEMIDOPHORUS, Wagl. 



This genus is characterized by a bifid tongue ; a double transverse 

 fold of skin under the throat ; teeth on the palate ; maxillary teeth com- 

 pressed, the posterior one tricuspid ; femoral pores ; broad plates under 

 the thighs ; fingers not carinated underneath ; and a subcylindrical, very 

 long and tapering tail. The body above is covered with minutely 

 crowded scales ; whilst on the belly there are eight longitudinal rows of 

 subquadrangular, transversely elongated plates, or scutellse. On the tail 

 the scales are quite large and very conspicuous, strongly carinated and 

 constituting circular rows or whorls. 



The explorations of the last few years in Texas and New Mexico have 

 brought to light several other species of the genus Cnemidophorus, all 

 provided with eight longitudinal rows of abdominal scutellse. These are 

 C. gracilis, from the desert of the Colorado ; C.perplexus, from the upper 

 valley of the Rio Grande ; C. gidaris, C. Grahamii, and C. marmoratus, 

 from different localities in Texas. 



The discovery of C. gularis in Arkansas is an interesting fact in 

 regard to its geographical distribution. 



5. GneMIDOPHORUS GULARIS, B. & G. 

 Zoology, PI. X, fig. 1—4. 



Spec. char. — Ground color brownish, with six longitudinal stripes, 

 green or yellow ; beneath yellowish white, unicolor. Scales on the sub- 

 guttural fold quite large and conspicuous in proportion to those in other 

 species. 



