U8 ON THE BATRACHIA AND RBPTILIA OF COSTA RICA. 



the types of the two genera named. In the C. semidoliatum the maxillary bone is 

 developed and bears teeth opposite the first labial plate. In the Colohognathus 

 hoffmannii, it with the palatine is cartilaginous in front, and bears no teeth anterior 

 to the fourth labial shield. In the C. hrachycephalum and C. dolichocephalum, the 

 maxillary and palatine are better developed, the teeth extending to the posterior 

 margin of the second superior labial. In the serpent described by me (Proc. Ac. 

 Nat. Sci. 1869, p. 131) as Catostoma nasale, the dentition is precisely as in the two 

 species here described, while in the C. hicolor, Gthr., the character of the dentition 

 is intermediate between them and that of the C. semidoliatum. In the genus Colo- 

 fhrys. Cope, from Guatemala and Yucatan (1. c. 1868, p. 130), the maxillary is 

 still better developed, the teeth commencing at the anterior part of the second 

 upper labial. 



111. CoLOBOGNATHUS HOFFMANNii, Peters, Monatsber. K. Preuss. Acad. 1863, p. 214. 



PROTEROGLYPHA. 



112. Pelamis bicolor, Daudin. 



This sea-snake has been now frequently brought from the Pacific coast of Cen- 

 tral America since the first note of its occurrence there, Proceed. Academy Phil- 

 adelphia, 1859, p. 347. 



113. Elaps multifasciattjs, Jan, Revue et Magazine Zoologie, 1859, PI. A. Cope, Proceed. 



Acad. Philada. 1871, p. 209. 

 San Jose ; Dr. Van Patten. 



114. Elaps ornatissimtjs, Jan, loc. cit. 

 San Jose ; Dr. Van Patten. 



115. Elaps nigrooinctus, Girard, TJ. S. Astronomical Expedition, II. p. 210, plate. 

 San Jose ; Dr. Van Patten. 



116. Elaps ciroinalis, Dum. Bibron. 



Several specimens with the rings varying in number from eleven to eighteen. 

 Scales in the intervals black tipped, Talamanca. 



SOLENOGLYPHA. 



Teleuraspides, Cope, Proceed. Academy Philada. 1871, p. 205. 



This group of the rattlesnake family embraces those with undivided anal 

 shields and no rattle. It stands immediately between the true Trigonocephali and 

 the Crotali, as the former have divided caudal scutella and the rattle absent, the lat- 

 ter possess the rattle with simple scutella. One genus of this division was described 



