PHRYN030MAD0UGLASSII. 71 



The tail is broad, thick and flat at its root, but soon becomes small, and 

 terminates in a point; above it is covered with scales and small tubercles, the 

 points of which are slightly elevated; similar points are scattered along the lateral 

 margin of the tail, but by no means form that beautiful serrated edge seen in the 

 Phrynosoma coronata. 



The abdomen is covered with large, smooth, rhomboidal scales, elongated 

 posteriorly. The vent is transverse, with small scales both before and behind. 



The anterior extremities are large, covered above with rhomboidal carinated 

 scales, and with a row of points along the front of the fore arm; beloAv, the 

 scales are smooth and small; there are five fingers, distinct, and each furnished 

 with a short, delicate, curved nail. The posterior extremities are but slightly 

 larger, and are covered like the anterior, with the exception of a few spines 

 scattered about the thighs and legs. There are eighteen femoral pores, well 

 developed. 



Colour. The head is brown above, as well as the tubercles; the chin is silvery- 

 white, Avith a few dusky circular spots. The superior surface of the neck and 

 trunk is light grey, with dusky spots and bands, and with a broad vertebral band 

 of yellowish-white; on each side of this vertebral line at the neck is an oblong dark 

 chestnut blotch, reaching to the shoulders; the throat is silver-white. The trunk 

 is marked with dark blotches, placed transversely, but none of them unite at the 

 vertebral line. The thorax and abdomen are silvery-white, with minute dusky 

 spots. The tail is coloured like the back, but is more completely banded towards 

 the tip; the inferior surface is silvery-grey. The anterior extremities, as well as 

 the posterior, are grey above and silvery-white below. 



Dimensions. Length of head, 8 lines; of body, from head to vent, 2 inches 8 

 lines; of tail, beyond the vent, li inches; of thigh, 7 lines; of leg, 7 lines; of tarsus 

 and toes, 7 lines; total length, 4 inches 10 lines. 



