n:t. 



long as its distance from the end of the snout, much shorter than 

 the parietals ; a small supraocular ; loreal twice and a half as long 

 as deep ; one postocular ; six upper labials, third and fourth entering 

 the eye ; four lower labials in contact with the anterior chin-shields, 

 which are longer than the posterior and separated from the sym- 

 physial. Scales in 15 rows, smooth on the nape, finely striated and 

 k'-rl.-il on tin- body and tail, the keels quite strong on the posterior 

 part of the back and on the base of the tail. Veutrals 131-138 ; 

 aii:il t-ntire ; subcaudals 30-40. Black above, with two alternating 

 l ut' l.-ir^r yellowish spots, some of which are confluent and 

 form cross bars ; belly uniform white, tail blackish. 



Total length 290 millim. ; tail 35. 



Costa Rica. 



a-b. $ (V. 1.35, 138 ; C. ?, 46). Cartage, Costa Rica. 



9. Geophis petersii. (PLATE XVI. fig. 2.) 

 Geophis chalybaea, part, Giinth. Bid. C.-Am., Kept. p. 87 (1893). 



M axillary not extending beyond palatine in front, the first tooth 

 corresponding to the suture between the second and third labial 

 shields. Eye very small, measuring two thirds to three fourths 

 its distance from the mouth. Snout obtusely pointed, pro- 

 minent. Rostral slightly deeper than broad, the portion visible 

 from above measuring three fourths its distance from the 

 frontal ; internasals twice as broad as long, one third the length 

 of the praefrontals, which are as long as broad ; frontal as long 

 as broad, a little longer than its distance from the end of the 

 snout, as long as the parietals ; a small supraocular ; loreal twice 

 and a half as long as broad ; one postocular ; six upper labials, 

 third and fourth entering the eye ; three lower labials in contact 

 with the anterior chin-shields, which are not longer than the pos- 

 terior and separated from the symphysial. Scales in 15 rows, 

 smooth, a few at the base of the tail faintly keeled. Ventrals 144- 

 145 ; anal entire ; subcaudals 35-36. Uniform dark brown above, 

 white beneath. 



Total length 200 millim. ; tail 28. 



Mexico. 



a-b. <$ (V. 144 ; C. .".'.) City of Mexico. Mr. Doorman [C.]. 



t $ (V.145; C,3.->). 



1". Geophis champion!. (PLATE XVI. fig. 3.) 

 Geophis chalybaea, part., Giinth. Bid. C.-Am., Rept. p. 87 (183). 



Maxillary not extending beyond palatine in front, the first tooth 

 corresponding to the suture between the second and third labial 

 shields. Eye very small, measuring two thirds its distance from 

 the mouth. Snout obtusely pointed, prominent. Rostral a little 



VOL. n. T 



