36. RHINOCHEILUS 775 
Soc. Nat. Hist., Vol. III, No. 4, 1921, p. 64; Van Densurcu & 
Stevin, Proc. Cal. Acad. Sci., Ser. 4, Vol. XI, 1921, p. 40, 45, 523 
Nexson, Mem. Nat. Acad. Sci., Vol. XVI, 1921, pp. 114, I15. 
Description —Head rounded and snout projecting and 
pointed. Temporal regions not swollen. Rostral plate 
large, prominent, recurved on top of snout, and bounded 
behind by internasal, anterior nasal, and first labial plates. 
Plates on top of head, a pair of internasals, a pair of pre- 
frontals, a broad frontal, supraocular of each side, and a pair 
of rather short, rounded parietals. Anterior and posterior 
nasals usually distinct, but sometimes united above nostril. 
Loreal small, elongate, sometimes entering orbit. One or 
rarely two preoculars and two or rarely three, postoculars. 
Temporals normally two followed by three, rarely 2+2, 
1+3, or 2+4. Eight (rarely seven or nine) superior and 
eight, nine or 10 inferior labials, seventh (or eighth) super- 
ior and fifth (or sixth) inferior largest, fourth and fifth (or 
fifth and sixth) superior reaching eye, first pair of inferior 
meeting on median line. One or two pairs of genials, 
posterior very narrow when present. Scales on body smooth, 
thin, in 23 or rarely 25 rows. Anal plate not divided. 
Gastrosteges varying in number from 186 to 216. Urosteges 
in one series, or more often in one series anteriorly and two 
posteriorly, of from 40 to 55. 
The snout is yellowish more or less marked with black. 
Back of this the head is black or brown, often spotted with 
yellow or white. Across the back is a series of large black 
or brown blotches; 20 to 34 on the body and 6 to 12 on the 
tail. These. blotches may be rounded, pointed, or truncate 
on the sides, and are from one and one-half to three times 
as long as the intervals which separate them. These inter- 
vals are brick red, orange, yellow, or white, and usually 
are continuous with the white or yellow of the lower 
surfaces. 
