13. COLUBRIDM 



of internasal plate. True loreal short and high; small 

 supraloreal and subloreal plates present. About three pre- 

 oculars, four postoculars, and two suboculars complete the 

 orbital ring. Temporals three followed by three. Supra- 

 labials six, last two largest, none reaching eye. Infralabials 

 nine, first and fifth largest, first pair meeting on median 

 line. Genials in one pair only. Scales on body in 1 9 rows, 

 those on anterior third nearly smooth, gradually becoming 

 distinctly keeled on posterior two-thirds of body. Anal 

 plate not divided. Gastrosteges 159. Urosteges in two 

 series of 31. 



The color above is white with from 13 to 46 seal -brown 

 blotches between the head and the tip of the tail. These 

 blotches become paler posteriorly. The first blotch begins 

 three scales behind the parietals, is of a uniform dark color, 

 rather long and shaped nearly like an hour glass, its anterior 

 border being concave and the anterior lateral corners pro- 

 duced to the angle of the mouth. A broad dark line crosses 

 the interorbital space and is continued on the posterior sup- 

 ralabials to nearly meet the extended corner of the first 

 dorsal blotch. The other dorsal blotches are more nearly 

 square, with rounded corners. Their borders are darker 

 than their central portions, where the dark color is only 

 powdered over the white ground. The white interspaces 

 are faintly powdered with brown on the sides. The lower 

 surfaces are white, without markings. 



Length to anus ._ 283 



Length of tail 42 



Distribution. — Only four specimens are known. All 

 were collected near Tucson, Arizona. 



Habits. — Unknown. The first two specimens were col- 

 lected by Mr. Herbert Brown. Mr. Karl P. Schmidt writes 



