102 



SYNOPSES AND DESCRIPTIONS; 



Geophis SEMIDOLIATUS. 

 Rabdosoma semi-doliatum Dura. & Bibr., 1854, Erp. Gin. VII, 93. 



Body slender; tail short, stout, Scales smooth, in 15 rows. Ventrals 

 172. Anal entire. Subcaudals 24 pairs. Whitish interiorly; 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 m , 275; tail m , 027. 



"Cinq plaques sus-labiales; pas de squamme temporale. Dessus du 

 corps coupe en travers par de grandes taches noires, sur un fond blanc. " 

 Plaque rostrale fort grancle; bord anterieur de la frontale brise sous un 

 angle tres-ouvert; susoculaires extremement courtes; premiere nasale ne 

 descendent pas plus bas que la seconcle; point de preoculaire; une seule 

 post-oculaire ; cinq supero-labiales, dout la 3 e seule touche a l'oeil ; deux 



paires de plaques inter-sous-maxillaires. Queue robuste 



II n'y a qu'une seule squamme temporale, mais elle est extremement 

 developpee; elle est oblongue pentagone inequilaterale et situee le long 

 de la plaque parietale au dessus de la derneire supero-labiale." Mexico. 

 (D. & B.) 



Geophis bicolor. 



G-imther, 1868, Ann. and Hag. 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 14^ inches long; 

 tail 3 inches. City of Mexico. 



