1068 The American Naturalist. December, 
II. A yellow band posteriorly from orbit, bounded below 
by a black or brown one. 
a. Saddle spots closed laterally on gastrosteges ; alternate | 
spots entirely on gastrosteges. 
.. A half collar behind parietal plates, no superciliary stripe 
. temporalis. 
aa. Saddle spots closed above gastrosteges; alternate snes on 
scales. 
A half collar nearly or quite touching occipital plates, no 
bands; alternate spots largely on gastrosteges O. d. collaris. * 
Neck with longitudinal bands; alternate spots largely on gas- 
trosteges O. d. clericus. 
Neck with bands; alternate spots entirely on scales 
O. d. triangulus. 
In figure 1 are represented vertical, lateral and inferior 
views of parts of the body of the subspecies triangulus, taken 
from a specimen in my collection from West Chester Co., New. 
York, which Iowe to the kindness of my friend Mr. T. H 
Mead. 
The characters of this form are seen in (1) the presence of a 
light band extending from the posterior angle of the eye 
` downward and backward, which is bounded by a black border 
above and below; (2) a black cross-band on the posterior bor- 
der of the prefrontal plates; (3) chevron shaped mark with the 
apex on the posterior part of the frontal plate, whose limbs 
extend posteriorly as a band on each side of the neck, where 
they are fused together, and continue as a single, broad band 
for a short distance; (4) a series of lateral spots which do not 
extend beyond the scales on to the gastrosteges, and which 
alternate with the dorsal spots; (5) a series of spots on the ends 
of the gastrosteges which alternate with the last mentioned; 
(6) a series of spots on the centers of the gastrosteges which 
alternate with the spots mentioned under (5). The ground 
color in this form is gray, and the spots are a rich brown with 
black borders. The belly has a white ground color. 
In fig. 2 we have the subspecies clericus, where the following 
modifications appear. The fusion of the limbs of the chevron 
is more complete, and the dorsal spots are more expanded 
