NATURAL SCIENCES OP PHILADELPHIA. 347 



Ophidia. 

 Caudisona t e r r i fi c a Laur. Cope in Mitchell's Resear. on Venom of Rattle- 

 snake, p. 120. No. 5783. (Braz.) 

 Bothrops alternatus Dum. Bibr., Erp. Gen., vii. p. 1512. No. 5822. 



Bothrops d i p o r u s Cope. 



Second superior labial as in B. alternatus, not forming the anterior 

 boundary of the fossette, and in contact with small scales below and behind 

 the nasals. Superior labials eight ; suture between third and fourth, a little 

 behind anterior margin of orbit. Scales of vertex strongly keeled ; lowest 

 row of temporals smooth. Superior margin of rostral one-third the length of 

 inferior ; superolateral margins very concave. Muzzle a little depressed in 

 profile ; canthus rostralis strongly pronounced, not acute. Scales in twenty- 

 five rows, strongly biporous. Caudal horn elongate. Gastrosteges 168, uros- 

 teges 50. Length of head and body 36 inches ; of tail, 5 inches 6 lines. 

 Ground-color yellowish brown, with numerous deep brown black-bordered 

 triangular spots, sometimes alternating, sometimes confluent at their apices. 

 On the sides their bases appear as though cut off by a longitudinal band of the 

 ground color, and the middle portions of them obliterated ; a general cruciform 

 outline often results when the confluence of the apices is complete. A longi- 

 tudinal spot on each side of the nape and occiput, a round one on each 

 parietal region, and one on the muzzle ; all obscured in old specimens. A 

 black band from orbit crossing upper parts of posterior superior labials. 

 Beneath yellowish, punctulated. with brown. Dark brown spots on the ends 

 of the gastrosteges. From the Vermejo River region. No. 5401. 



Elaps frontalis Dum. Bibr., 1. c. vii. p. 1223. 



Frontals pale bordered, or a pale band across postfrontals (var. b a 1 i o- 

 coryphus.) (Braz.) 



Elaps altirostris Cope, Pr. A. N. S. Philada., 1859, p. 345. 



The native country of this species is now first ascertained. It is readily 

 distinguishable by its rather elevated front and elevated labial shield. The 

 gular region is almost entirely black. No. 5346. 



Elaps pyrrhocryptus Cope. 



Rings in threes six triads on the body and one on the tail in the specimen 

 described ; the red interspaces are a little longer than the middle black ring ; 

 the scales which they involve are so broadly tipped with black as to obscure 

 (in one place completely) the red ground. Middle black ring twice as wide 

 as outer black ring ; the latter twice as wide as the inclosed yellow ring. Neck 

 to occipital plates covered by a red space. Head black, the frontals narrowly, 

 the labials broadly margined with yellow or red. Gular region light, inferior 

 labials margined with black. Rings complete on the belly. Head depressed ; 

 muzzle obtuse, short. Rostral plate broader than high ; postnasal smaller 

 than prenasal, well in contact with preocular. Lateral, occipital and frontal 

 borders of vertical equal. Total length. No. 5395. 



This species is allied toE. melanogenys and marcgravii. 



Cochliophagus inaequif as ciat u s Dum. Bibr., Erp. Gen., vii. p. 480. 



The genus Cochliophagus differs from Dipsas (Leptognathus, Gthr.) in the 

 absence of a larger vertebral series of scale?, and in the compression of the 

 head posteriorly. The maxillary bones exhibit a rudiment of the horizontal 

 wing, so developed in Dipsas. The native country of the only species has been 

 supposed to be Brazil, by Dumiril and Bibron. No. 5815. 



Oxyrhopus trigeminus Dum. Bibr., viii. p. 1013, No. 5818. (Braz.) 



Phimophis guerini Cope, Pr. A. N. S. Philada., 1S60, p. 79, Dum. Bibr., 

 vii. p. 991. 



1862.] 



