The
dorsum of
U. ellioti is dark brown, either uniform or with yellow dots. There is a yellow stripe on each side of the neck, and a yellow stripe on each side of the tail. The venter is dark brown with small yellow dots, and there is a yellow transverse bar across the vent, which connects the stripes on the sides of the tail. Adults may attain a total length (including tail) of . The
dorsal scales are in 19 rows behind the head, in 17 rows at midbody. The
ventrals number 144–172; and the
subcaudals number 6-10. The snout is pointed. The
rostral is about ⅓ the length of the shielded part of the head, the portion visible from above longer than its distance from the frontal. The
nasals are in contact with each other behind the rostral. The eye is very small, less than half the length of the ocular shield. The diameter of the body goes 25 to 32 times in the total length. The ventrals are nearly twice as large as the contiguous scales. The end of the tail is convex or somewhat flattened dorsally. The dorsal scales of the tail have 3 to 6 strong keels. The terminal scute has a transverse ridge and two points. ==Behavior==