694 13. COLUBRIDZ 
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 19 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. 
Terre t Oneal ri seme eee ac eee ee Be 283 
Henrie tho fasta eee eee lean ees ok Se 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 
