Colour yellowish-brown, beautifully marked with 6 or 7 longitudinal series of alternating, elongate, dark brown, black- and white-edged spots, separated by narrow interspaces of the ground-colour; a pair of diverging dark bands on the top of the head, separated by a narrow pinkish-white streak; belly pinkish or yellowish, spotted with dark brown.
Total length, 600 millimetres; tail 60.
Habitat: Tableland of Mexico.
(10) C. lepidus.—12 supralabials; scales in 21 or 23 rows, dorsals strongly keeled; 153-169 ventrals; 24-31 subcaudals.
Colour brown or greenish-grey, with dark brown or jet-black light-edged cross-bands, narrowing on the sides; two dark spots, or a V- or heart-shaped black marking on the nape; belly dirty white, spotted with brown.
Total length, 350 millimetres; tail 60.
Habitat: Western Texas, New Mexico, Arizona, North Mexico.
(11) C. cerastes (Horned Rattle-Snake; [fig. 76]).—Supraocular transformed into a raised horn-like process; 11-13 supralabials; scales in 21 or 23 rows; dorsals feebly keeled, each scale along the middle of the back with a central tubercular swelling; 146 ventrals; 17 subcaudals.
Fig. 76.—Crotalus cerastes (Horned Rattle-Snake.) (After Baird and Stejneger.)