SYNOPSES AND DESCRIPTIONS. 25 
TROPIDONOTUS RUFIPUNCTATUS. 
CHILOPOMA RUFIPUNCTATUM Yarrow (Cope MS.), 1875, Zool. Wheeler’s Survey, p. 544, pl. XX, fig. I. 
Moderately slender, tapering to head and tail; head distinct, elongate, 
narrowed anteriorly; tail about one fourth of total. Eye moderate, pupil 
round. Crown-shields regular. Rostral turned over the superior face 
of the muzzle, posterior border truncate. Internasals longer than wide. 
Prefrontals decurved laterally. Nasal long, narrow. Preocular higher 
than wide, in contact with the frontal. Two preoculars on one side. 
Frontal elongate, obtuse behind. Parietals elongate, bounding the upper 
postocular behind. Postoculars three. Temporals 143. Labials eight, 
last very small, fourth and fifth bounding the orbit below. Infralabials 
nine. Submentals two pairs. Scales keeled, in 21 rows, first and second 
smooth, poreless. Ventrals 177. Subcaudals 44-83 pairs. 
Light brown above, olive shaded on the head. Anterior half of body 
marked with six rows of small alternating bright rufous or orange spots, 
each of which occupies one and sometimes an adjoining scale. They stand 
on the first and second, the fifth, and on the eighth rows respectively. On 
the posterior third of the length they are wanting, and are indistinct poste- 
rior to the middle. Lower surfaces pale brownish-grey; the base of each 
ventral with blackish markings. Labials light; head without spots. The 
figure does not agree with the description. Southern Arizona. (From 
descr.) 
Troprponotus saurita, pl. ITT, fig. 2. 
Couper saunita Linné, 1766, Syst. Nat., ed. XIT, 385. 
Troprponotus saurita Schlegel, 1837, Ess. Phys. Serp. IT, 321. 
Body slender; head distinct, crown flat; tail long, near a third of the 
total length, slender. Eye large, over the fourth and fifth labials. Nine 
head-shields. Frontal hexagonal. Rostral broader than high. Nasal in 
two parts, nostril between, near the upper edge. A loreal. Oculars 1—3. 
Temporals 1+2. Mouth-cleft deep, curved. Labials 8 (7—8), third and 
11), fifth 
and sixth large. Submentals two pairs, elongate, narrow, hinder larger. 
Scales keeled, in 19 rows, outer broader. Ventrals broad, 150—160 (with 
var. proximus 150—180). Anal entire. Subcaudals 110—120 (100—120). 
Brown to black, olivaceous beneath. With a dorsal and two lateral 
fourth in orbit when there are but seven. Infralabials 10 (9 
narrow lines of yellow. Lateral lines upon the third and fourth rows of 
scales; below them on the outer rows the color is brown, sometimes very 
