TAPAYA DOUGLASS I. 399 



The dorsal scales have a comparatively smooth appearance, being 

 but slightly keeled. The large scales, which are interspersed in the 

 midst of the small ones, are generally less numerous than in the other 

 species of the genus. There is but one well-developed series of pyra- 

 midal scales at the periphery of the abdomen. One series of them 

 may be observed on the sides of the tail, and scattered ones over its 

 upper surface. The abdominal scales are smooth, and rather more 

 developed upon the middle region than towards the sides; also more 

 so anteriorly than posteriorly. The scales covering the upper and 

 anterior aspects of the limbs are but slightly keeled, whilst they are 

 smooth beneath and behind. The femoral pores number from four- 

 teen to eighteen on either side, and, as usual, more conspicuous in the 

 male than in the female, closely approximating upon the interfemoral 

 region, over which they extend, without forming a continuous series. 



The ground color above is greyish-olive or brown. A large, elon- 

 gated, black patch is observed on either side of the neck. A double 

 or quadruple series of black spots, sometimes united into transverse 

 bands, exist on the upper region of the body ; five more of such bands 

 may be seen on the caudal region. Their posterior margin, or else the 

 entire intervening space, is of a yellow or of an orange hue. The upper 

 surface of the limbs is barred, spotted, or clouded with blackish. 

 Beneath, the ground color is either yellowish (in the female), or 

 whitish (in the male), unicolor, else more or less thickly dotted with 

 black. The dots are oftentimes so crowded under the head, as to 

 give that region quite a dark appearance. 



Log. — Mountainous regions of Oregon. Less common west of the 

 Kocky Mountains than eastwardly. 



Plate XXI, fig. 1, represents a side view of the female sex of Tapa- 

 ya douglassi, size of life. 



Fig. 2, is an upper view ; and, 



Fig. 3, an under view of the same specimen. 



Fig. 4, a front view of the head. 



Fig. 5, the thighs and postanal region of the male sex. 



