HOMALOCRANIUM. 151 
no loreal; one pre- and two postoculars. Temporals1+1. Seven upper labials, the 
seventh higher than the sixth. The first pair of lower labial shields in contact with 
each other. Eye half as large as the space between eye and end of the snout. Scales 
in fifteen rows. Ventrals 149; anal divided; subcaudals 54. Head black; snout to 
the middle of the posterior frontals yellow; the fifth supralabial yellow; two narrow 
yellow collars, each broadly edged with black, the anterior crossing the extremity of 
the occipital shields. The anterior third of the trunk with alternating yellow, black- 
edged, transverse spots, extending from the vertebral line to the ventrals; these spots 
become indistinct on the remainder of the body. Lower parts uniform yellow. 
Known from a single specimen, 19 inches long. 
11. Homalocranium deppii. 
Homalocranion deppii, Bocourt, Miss. Sc. Mex., Rept. p. 584, t. 36. figg. 11, ll a-d. 
Hab. Soutaern Mexico (f. LD. G.). 
Head flat, depressed; eye of moderate size, at least half as long as the snout. 
Vertical shield broader than long, six-sided, with an obtuse angle in front and an acute 
one behind. Seven upper labials; posterior nasal broadly in contact with the ante- 
ocular; one ante- and two postoculars; temporals 1+1. Mental slightly in contact 
with the chin-shields. Scales in fifteen rows. Ventrals 152; anal divided; subcaudals 
55. Upper parts brownish-olive, the head darker; back with five parallel brown lines, 
half a scale broad—one running along the median line, one on either side along the 
fifth, and the other along the third outer series of scales. A narrow yellowish collar, 
interrupted in the middle by the median brown line. Lower parts whitish. 
Our specimen is 10 inches long, of which the tail takes 23. 
12. Homalocranium teniatum. 
Homalocranion teniatum, Bocourt, Miss. Sc. Mex., Rept. p. 587, t. 37. figg. 3, 3.a-e. 
? Homalocranium trivittatum, Mill. Verh. naturf. Ges. Basel, vil. p. 678 (1882). 
Hab. Guatemata (Bocourt); Honpuras, Bonacca I. (Mus. Brit.). 
Vertical shield longer than broad, with an obtuse angle in front. Seven upper 
labials ; posterior nasal in contact with the anteocular; one ante- and two postoculars ; 
temporals 1+1. The median lower labial is slightly in contact with the chin-shields. 
Scales in fifteen rows. Ventrals149, 163; anal divided ; subcaudals 68,69. Brownish, 
with three light longitudinal bands, which are only half as broad as the space between 
them. A yellowish collar, two scales broad, crosses the neck immediately behind the 
head, and is not conneeted with the longitudinal bands. 
I should, without hesitation, refer H. trivittatwm as a synonym to this species, but 
for the six upper labials ascribed to it by Miiller; however, as this author mentions a 
seventh labial, which he calls a “ postlabial,” it is probable that the twu snakes in 
reality do not differ in this respect. 
