GEOPHIS. 9] 
Colobognathus brachycephalus, Cope, Proc. Ac. N. Sc. Phil. xxiii. p. 211 (1871), or 
Catostoma brachycephalum, Cope, Journ. Ac. N. Se. Phil. viii. p. 147 (1876), also from 
Costa Rica, is probably identical with this species; but Cope describes it as having only 
124 ventrals, and with a whitish lateral band on the body, which extends from the side 
of the neck to the tail, and is composed of two rows of alternating narrow spots, which 
are not always perfectly united. 
6. Geophis dugesii. 
Geophis dugesit, Bocourt, Miss. Sc. Mex., Rept. p. 573, t. 37. figg. 1, 1 a—d. 
Hab. Mexico, Tangancicuaro (Dugés). 
Head rather narrow. Anterior frontals small; a small supraocular and a single 
postocular present; six upper labials, the fifth forming a suture with the occipital. 
The first pair of lower labials form a suture together; anterior chin-shields twice as 
long as posterior. Scales in fifteen rows, smooth. Ventrals 176; anal entire. Upper 
parts black, and the anterior part of the body with six or seven yellowish half-rings 
which on the posterior parts become more and more indistinct; lower parts yellowish. 
I have not had the opportunity of examining specimens of this species. 
7. Geophis bicolor. 
Geophis bicolor, Giinth. Ann. & Mag. N. H. 1868, i. p. 416 *. 
Rhabdosoma guttulatum, Cope, Proc. Am. Phil. Soc. xxii. p. 885 (1885). 
Hab. Mexico, city of Mexico (Doorman), Jalisco, La Cumbre de los Arrastrados 
(A. C. Buller), Vera Cruz (Sumichrast). 
Head rather broad, short, and depressed ; body and tail of moderate length. Eye 
small, with elliptical pupil. Anterior frontals about one-fourth the size of the 
posterior; vertical rather longer than broad, with the anterior angle very open; 
supraocular well developed; occipitals as long as postfrontals and vertical together, 
rounded behind; six upper labials, the third and fourth entering the orbit ; the fifth is 
the longest, and forms a long suture with the occipital}. The remainder of the temple 
is covered by scale-like temporals,1+2. Two postoculars. Anterior chin-shields twice 
as long as posterior, relatively shorter in specimens from Jalisco, in contact with four 
labials. Scales in seventeen rows, smooth, without apical groove. Ventrals 151-168; 
anal entire; subcaudals 39-48. Upper parts uniform black, lower white; on the two 
or three outer series of scales the white colour appears in more or less distinct small 
spots, whilst the black of the upper parts extends to the angles of the ventral shields. 
* Cope (Bull. U. 8S. Nat. Mus. no. 32, p. 85) refers to this species ‘“ Colobognathus hoffmanni of Jan,” 
Iconogr. Ophid. xii. t. 2. fig. 3; but as this author figures his specimen with fifteen rows of keeled scales, and 
five upper labials, Mr. Cope’s identification is at least doubtful. 
+ In the largest specimen from Jalisco a small temporal intervenes ; it is a detached portion of the fifth labial. 
*12 2 
