GEOPHIS. 89 
II. Scales in seventeen rows ; one pair of frontals only.—Geophidium dubium. 
Hab. ? 
III. Scales in fifteen rows. Two pairs of frontals. 
D. Scales on the back slightly keeled ; a small supra- and a postocular; six upper labials, the 
third and fourth entering the orbit. 
a. Uniform brownish-black above, yellowish below. Ventral scutes 129 or 134 or 135, 
Hab. Mexico (Sallé). 
6. Back brownish-black, crossed by large quadrangular white spots, equidistant and half as 
broad as the distance between them, not extending downwards to the whitish colora- 
tion of the abdomen. Ventral scutes 144.—Var. guadrangularis,m. (Tab. XXXIII. 
fig. B.) 
Hab. Costa Rica, Cartago (Brit. Mus.). 
E. Scales on the back nearly entirely smooth; a small supra- and a postocular; six, sometimes 
five, upper labials, the third and fourth entering the orbit.—Colobognathus hoffmanni. 
c. Uniform brownish-black above, whitish below. Ventral scutes 143 (Mexico) or 127 
(Costa Rica and Chiriqui). 
Hab. Mexico, city of Mexico (Doorman); Costa Rica (Mus. Berol.); Panama, 
Chirigui (Champion). 
d. Brown, each ventral scute more or less widely brown transversely ; an indistinct lighter 
band across the nape; sides of the back sometimes with an indistinct incomplete 
longitudinal band. Ventral scutes 139-147. 
Hab. Costa Rica, Irazu (Mus. Salvin & Godman). . 
F. Scales entirely smooth; no supraocular, the occipital and postfrontal meeting above the eye ; 
a small postocular ; six upper labials, the third and fourth entering the orbit. Above 
uniform blackish-brown. Ventral scutes 144-146. 
Hab. Costa Rica, Irazu (Mus. Salvin & Godman). 
IV. Scales in fifteen rows. One pair of frontals only. 
Scales smooth ; supra- and postocular confluent. Ventral scutes 189. Blackish above, white 
below.—Geophis fuscus. 
Hab. Mexico, Jalapa (Fischer). 
3. Geophis rostralis. 
Elapoides rostralis, Jan, Iconogr. Ophid. xii. t. 2. fig. 2. 
Geophis rostralis, Bocourt, Miss. Sc. Mex., Rept. p. 533, t. 31. figg. 10, 10 a-c. 
? Geophis dubius, Bocourt, 1. c. p. 582, t. 381. figg. 9, 9 a-c. 
Hab. Mexico (Sallé). 
A supraocular and one postocular. Two pairs of frontal shields, of which the 
anterior pair are very small (and, apparently, sometimes coalesce with the posterior). 
Six upper labials, the third and fourth entering the orbit, and the fifth in contact with 
BIOL. CENTR.-AMER., Rept., May 1893. *12 
