47. SISTRURUS 907 
of small chestnut-brown blotches along the sides and a row 
of Jarge brown dorsal blotches. A pair of elongate brown 
blotches extend from the supraoculars back onto the neck. 
A narrow chestnut-brown band extends down and back from 
the prefrontal plate to the eye and on to the neck, and is 
bordered below by a narrow yellowish stripe which extends 
from the nostril to the angle of the mouth. The snout and 
upper jaw are brown, with two yellow rays diverging from 
the pit. The chin and lower jaw are mottled with brown 
and yellow. The dorsal blotches are about 34 to 45 in num- 
ber between the head and the anus, and are somewhat irreg- 
ular in shape. They are brown bordered with black and 
margined with yellow. There are about four to eight simi- 
lar blotches on the tail. The lateral blotches are proportion- 
ally small, and alternate with the dorsal and the other lateral 
series. Those of the upper series are more or less obsolete. 
Those of the second series are darker and occupy scales of the 
second, third and fourth rows. The lowest series is con- 
fined to single scales of the first and second rows. The 
belly is light straw-color, irregularly dotted and sprinkled 
with brown. 
Mength to) anus. 187 248 380 412 450 
cenpthi of stale _ 28 32 53 63 70 
Distribution—Edwards Massasauga ranges from Okla- 
homa through western Texas to the Mexican border. Three 
specimens have been found in southeastern Arizona. Two 
of these, collected by H. W. Henshaw, have no more defi- 
nite locality. The third specimen was secured, by Dr. Wil- 
cox, on the parade ground of Fort Huachuca, Cochise 
County. 
