4o4 Mr. G. A. Bouleuger on neio 



vertical sides and projecting edge to the supraocular shield ; 

 eye large, with round pupil ; a single nasal ; no loreal. 

 Body elongate, slightly compressed ; scales smooth, with 

 apical pits, in 17 rows ; ventrals rounded. Tail rather long; 

 subcaudals in two rows. 



This genus appears to be related to Synchalinus, Cope, 

 which is only known to me from the description. 



Phrydops melas. 



Snout subtruncate, scarcely longer tlian the eye, with 

 sharp cantlius and vertical loreal region. Rostral broader 

 than deep, scarcely visible from above ; nasal large, in 

 contact with the prajocular ; internasals shorter than the 

 prefrontals ; frontal nearly twice and a half as long as 

 broad, a little narrower than the supraocular, longer than its 

 distance from the end of the snout, shorter than the parietals ; 

 one praiocular, not extending to the upper surface of the head ; 

 two postoculars, both in contact with the parietal, which in 

 front is very narrowly separated from the fifth upper labial ; 

 temporals 1 + 2 ; seven upper labials, third and fourth entering 

 the eye ; four lower labials in contact wnth the anterior chin- 

 shields, which are shorter than the posterior. Scales in 17 

 rows. Ventrals 135 ; anal divided ; subcaudals 69. Black 

 above and beneath, head and anterior part of body minutely 

 speckled with brown. 



Total length 380 mm. ; tail 105. 



A single female specimen from Carriblanco, Costa Rica, 

 collected by Mr. C. H. Lankester. 



Rhadincea Steinhachi. 



Rostral broader than deep, just visible from above; inter- 

 nasals broader than long, shorter than the praefrontals ; frontal 

 once and two thirds to nearly twice as long as broad, as long 

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

 snout, shorter than the parietals ; loreal as long as deep or a 

 little deeper than long ; one prse- and two postoculars ; 

 temporals 1 + 2 ; eight upper labials, third, fourth, and tifth 

 entering the eye ; tive or six lower labials in contact with 

 the anterior chin-shields, which are as long as the posterior. 

 Scales in 15 rows. Ventrals 142; anal divided; subcaudals 

 67-69. Grey above ; anterior part of body with a broad 

 dark brown or black vertebral band and a narrower lateral 

 band ; head dark brown or black above, with an oblique 

 white spot in front of the eye, another behind the eye, and a 

 tliird behind the parietals; upper lip and lower parts white. 



