$02 SYNOPSES AND DESCRIPTIONS: 
G EOPHIS SEMIDOLIATUS. 
RawposoMA SEMI-DoLIATUM Dum. & Bibr., 1854, Erp. Gin. VI, 93. 
Body slender; tail short, stout. Scales smooth, in 15 rows. Ventrals 
172. Anal entire. Subcaudals 24 pairs. Whitish inferiorly; the white 
also serves as a ground color for large quadrilateral black or brown spots 
or transverse bands on the back, which are separated by spaces narrower 
than themselves, and about thirty in number. The black cap on the head 
is separated from the first spot on the back by a narrow collar of white. 
Trunk O°, 275; tail 0", 027. 
“Cing plaques sus-labiales; pas de squamme temporale. Dessus du 
corps coupé en travers par de grandes taches noires, sur un fond blane. 
Plaque rostrale fort grande; bord antérieur de la frontale brisé sous un 
angle trés-ouvert; susoculaires extrémement courtes; premiére nasale ne 
descendent pas plus bas que la seconde; point de préoculaire; une seule 
post-oculaire; cinq supéro-labiales, dout la 3° seule touche a Veil; deux 
paires de plaques inter-sous-maxillaires. Queue robuste. 
I] n’y a quwune seule squamme temporale, mais elle est extrémement 
développée; elle est oblongue pentagone inéquilatérale et située le long 
de la plaque pariétale au dessus de la dernéire supéro-labiale.” Mexico. 
(D. & B.) 
GEOPHIS BICOLOR. 
Giinther, 1868, Ann. and Mag. N. Hist., 416. 
“Head rather broad, short, and depressed; body and tail of moderate 
length. Eye small. Anterior frontals about one fourth the size of poste- 
rior; vertical rather longer than broad, with the anterior angle very open; 
occipitals as long as postfrontals and vertical together, rounded behind; 
six upper labials, the third and fourth entering the orbit; the fifth is the 
largest, and forms a long suture with the occipital. The remainder of the 
temple is covered by scale-like temporals, 1+2. Two postoculars. Ante- 
rior chin-shields twice as long as posterior, in contact with four labials. 
Scales in. seventeen rows, smooth, without apical groove. Ventrals 160— 
168; anal entire; subcaudals 39—48. 
“Upper parts uniform black; below white; on the two or three outer 
rows of scales the white color appears in more or less distinct small 
spots, whilst the black of the upper parts extends to the angles of the 
ventral shields, each subcaudal black in front.” Largest 144 inches long; 
tail 3 inches. City of Mexico. 
