138 ON THE BATRACHIA AND REPTILIA OP COSTA RICA. 



Sides shaded above; no dorsal bands nor abdominal spots; light lines on sides of 

 nape. C. fissidens, Gthr. 



Lines very indistinct, none on nape ; two rows of brown spots on belly. 



C. bipunctatus, Gthr. 

 III. Scales in nineteen rows. 



Labials seven or eight ; sides dark, a narrow vertebral line ; a light band behind 

 each orbit. C. proterops, Cope. 



Labials eight ; sides dark, a broad dorsal band from head ; a light band from end 

 of muzzle above eye. C. imperialis, B. & G. 



Labials seven ; frontal plate wide ; head black, body red. C. lateritius, Cope. 



95. Pliocercus dimidiattjs, Cope, Proceed. Academy Philada. 1865, p. 190. 



Tail two-fifths the total length; urosteges 120, nearly equal in number to the 

 gastrosteges — 127. Scales in seventeen rows, the median scarcely narrowed. Head 

 very distinct, flat, muzzle truncate. Top of rostral shield round, curved back on 

 the upper plane. Internasals very small; lateral borders of frontal (vertical) nearly 

 parallel, a little shorter than anterior. Occipitals large. Temporals, 1 very narrow, 

 1 pentagonal, 2. Loreal nearly a rhomb, lower than postnasal ; preoculars three, 

 upper not reaching frontal, lower cut from labial. Superior labials nine, fifth and 

 sixth entering orbit; postoculars two, superior in contact with occipital only. 

 Nine inferior labials, sixth largest; geneials equal. Teeth equal. 



Red, crossed by fourteen black rings on the body, and eight and a part on the 

 tail. These are separated by nearly equal spaces below, and rather narrower (3| 

 scales) above. A black space involves the nape to the tips of the occipital and 

 last upper labial plates and all the last lower, and does not meet on the jugulum. 

 The remainder of the head above black except the anterior part of the frontal 

 and the first, second, and third superior labial shields. Lower labials bordering 

 anterior geneials, with symphyseal, black. 



Costa Rica; sent by Charles N. Riotte, correspondent of the Smithsonian 

 Institution : Mus. No. 6363. 



96. Rhadinjea decorata, Gth. 1. c. 35 (Coronella). 

 Sipurio ; abundant. 



The genus Rhadinaa is nearly coextensive with Enicognathus, Jan, and Allabes, 

 Giinther. Ablabes of Dum. Bibr. was, however, established on the Coronella rufula 

 of Schlegel, which has the prolonged series of gastric hypapophyses, and is there- 

 fore quite different, while Henicognathns is characterized by a peculiar structure of 

 the mandible, which, so far as I am aware, occurs in only one American species, 

 the H. annulatus, D. B. Consequently the majority of species attached to this 



