960 16. CROTALIDA 
specks farther back becoming so numerous as to merge into 
spots or blotches until the posterior half of the ventral sur- 
face is almost entirely dark brown; a white median line on 
rostral continuing onto lower jaw and expanding between 
two wide dark bars, which extend about halfway back on the 
jaw; a light line bordering the second, third, fourth, and 
fifth labials continuing onto the lower jaw; a light band 
extending obliquely from the nasals, under the eye to the 
last four labials, covering them almost completely; below 
this, running across the pit, a dark band spreading out onto 
five or six lower labials; a prominent dark postocular band, 
about three scales wide, not bordered by white above.” 
In life, the general color above is yellowish cinnamon 
with grayish white or very pale cinnamon dorsal cross-bars 
which probably represent interspaces between obsolete 
rhombs. Each light bar is partially edged with black and 
deep cinnamon. On the sides are rather small dark cinna- 
mon or chestnut spots, the most evident ones being at the 
lateral extremities of the light dorsal bars and on the first 
and second and third and fourth rows of scales, making, 
where well developed, three lateral series of alternating 
spots. The proximal portion of the tail above is colored like 
the body, but the distal portion is bluish ash-gray, marked 
with red at the bases of the scales, the lower row of caudal 
scales and the urosteges are red, edged with pure white. 
The light stripes on the head are pure white, the dark 
streaks, deep cinnamon. The temporal regions are tinged 
with olive. The lower surfaces are marbled with cinnamon, 
black and white. Many of the scales on the body have one 
or more minute black dots. 
Length to anus.________196 220 380 444 445 
Gength) of tall. = eee 20 18 35 51 37 
Distribution —This rattlesnake has been found only in 
