320 C0LUBEID.5:. 



visible from above measuring one fourth to one third its distance 

 from the frontal ; internasals much broader than long, one fourth 

 to one third the length of the prsefrontals, which are longer than 

 broad ; frontal as long as broad or slightly broader than long, as 

 long as or a little longer than its distance from the end of the snout, 

 shorter than the parietals ; a vei'y small supraocular ; loreal twice 

 to twice and a half as long as deep ; one postocular (rarely two) : 

 six upper labials, third and fourth entering the eye ; three lower 

 labials in contact with the anterior chin-shields, which are a little 

 longer than the posterior and separated from the symphysial. Scales 

 in 15 rows, smooth on the anterior part of the body, finely striated 

 and feebly keeled on the posterior part and on the base of the tail. 

 Ventrals 124-145 ; anal entire ; subcaudals 28-36. Blackish 

 brown above, young with a more or less distinct yellowish blotch 

 across temples and occiput ; ventrals and subcaudals brown edged 

 with whitish, or whitish edged with brown. 



Total length 450 millim. ; tail 70. 



Costa Rica. 



a. Hgr. S (V. 130 ; C. Costa Rica. Prof. Peters [E.]. 



34). (One of the types.) 



b-e,f. 2 (V. 141, 141, Irazu, Costa Rica. O. Salvin & F. D. 



145, 138 ; C. 34, 34, Godman, Esqrs. [P.]. 



30, 34) & hgr. (V. 



135; C. 36). 



g. Yg. (V. 145 ; C. 36). Cartago, Costa Rica. (Type of G. mastus.) 



8. Geophis dolichocephalus. 



Colobognatlius df)liehocephahis, Copp, Proc. Ac. Pldlad. 1871, 



p. 211 * ; Gimth. Zool. Rec. 1872, p. 72. 

 Geophis chalybffius, var., Giinth. Ann. ^- Mar/. N. H. (4) ix. 1872, 



p. 16. 

 Catostoma dolichocephalum, Cope, Jouni. Ac. Philad. (2) viii. 1876, 



p. 147. 

 Elapoides dolichcicephalus, Cope, Proc. Avier. Philos. Soc. xxii. 



1885, p. 386. 

 Geophis dolichocephalus, Giinth. Biol. C.-Am., Rept. p. 87 (1893). 

 chalybsea, var. quadrangularis, Giinth. I. c. p. 89, pi. xxxiii. 



fig. B. 



Maxillary not extending beyond palatine in front, the first tooth 

 corresponding to the suture between the second and third labial 

 shields. Eye small, nearly as long as its distance from the mouth. 

 Rostral moderate, as deep as broad, the portion visible from above 

 measuring about one third its distance from the frontal ; internasals 

 broader than long, one fourth to one third the length of the pr£&- 

 frontals, which are longer than broad ; frontal as long as broad, as 



* It appeared to me probable that " thirteen longitudinal series of scales," 

 in the description, was a slip of the pen or a misprint for " fifteen longitudinal 

 series." Having comniunicatod with Prof. Cope on this matter, he has kindly 

 examined the type specimen, and informs me that the scales are iu 15 rows. 



