42. CHILOMENISCUS—43. TANTILLA 87 
way 
fourth often largest, first pair meeting on median line. 
Genials in two pairs, posterior much smaller. Scales on body 
smooth, in 13 rows. Anal plate divided. Gastrosteges vary- 
ing in number from 112 to 117. Urosteges in two series of 
from 21 to 26. 
The top of the head is grayish dotted with brown. 
The ground color of the upper surfaces of the body and 
tail in adult specimens varies from brownish drab to bright 
yellowish cinnamon. It is cream buff in a younger individual. 
Dark brown spots are present near the tips of the scales in 
all specimens, but do not appear upon the first row of scales. 
They are present rarely upon the scales of the second row, 
but constantly upon those of the third. The first, second 
and half of the third rows of scales are yellowish white or 
straw-color, as are also the gastrosteges. 
Lengthito-anusi = 22s 195 196 197 207 237 
Isength, of tale 28 30 26 29 35 
Distribution.—This beautiful little snake has been found 
only in the southern part of Lower California. It has been 
collected at Cape San Lucas, San Jose del Cabo, Miraflores, 
San Marthe, and La Paz. 
Genus 43. Tantilla 
Tantilla Barrp & Girarp, Cat. N. Amer. Rept., Pt. 1, Serp., 1853, p. 131 
(type, coronata). : 
Homalocranion DumERiL, Mem. Ac. Sci. Paris, Vol. XXIII, 1853, p. 490. 
The body is very slender, with tail of moderate length 
and no constriction at neck. The snout protrudes a little 
beyond the lower jaw. The head is very low, and very 
flat above. Its plates are normal, except that there is no 
loreal. One preocular and one or two postoculars are 
present. The scales are smooth, arranged in 15 (or 13) 
