886 13. COLUBRIDAE 
of the frontal plate, crosses the supraocular and parietal 
plates, passes out over the temporal region, and becomes 
narrower and parallel with its fellow upon the neck. On the 
parietal plates is a brown spot, elongated posteriorly. The 
dorsal region is occupied by a series of dark brown, paired 
blotches, of which there are from 21 to 28 between the head 
and anus. There is an irregular series of dark lateral spots, 
alternating, and sometimes confluent, with the dorsal 
blotches. Anteriorly these lateral spots may form a narrow 
interrupted band. There are nine or 10 confluent pairs of 
dark spots on the upper surface of the tail. The entire 
lower surface is whitish, except that a series of spots involves 
the tips of certain of the gastrosteges, the spotted scutes be- 
ing separated by from two to five unmarked ones. 
Beneth towan tise ne or eee 588 588 600 835 
Mength totwtatl =e eee ee 110 108 110 155 
Distribution.—This species of Trimorphodon has been 
found only in southern Arizona and in Lower California. 
In Arizona, it has been secured in the Cayetano Mountains 
near Calabasas and at Fort Buchanan, Santa Cruz County, 
at Fort Huachuca, Cochise County, and in the Tucson Range 
and near Rosemont, Pima County. Lower Californian 
specimens have been collected at Cape San Lucas, La Paz, 
San José del Cabo, Sierra San Lazaro, Santa Anita, and 
Santa Rosalia. 
Remarks.—Professor Cope described the teeth as fol- 
lows: 
Seven teeth upon the superior maxillary bone, of which 
one posterior is elongate and grooved, three central, small 
and recurved, and three anterior, very long, the first longest 
and least recurved. The central three are not separated 
from those anterior and posterior to them by spaces wider 
