NATURAL SCIENCES OF PHILADELPHIA. 201 



Himantodes cenclioa, L. 

 Oxyrrhopus occipitoluteus, D- B. 

 Nothopsis rugosus, Cope, gen. et. sp. nov. 



DKOMICUS IGNITUS, Cope. 



Posterior superior maxillary tooth scarcely longer than those 

 prececliug, but separated by a marked interspace. Scales in seven- 

 teen longitudinal series. Form slender, head little distinct. Ros- 

 tral plate scarcely visible from above ; common internasal suture 

 considerably shorter than frontal shield, which is shorter than 

 common suture of occipitals. Length of muzzle to orbit, equal 

 ■width of frontal and one superciliary. Dorsal longer than high. 

 Orbitals 2-2, in one case by median division, in another by infe- 

 rior intercalated between labials. Temporals 1-1^, the first occu- 

 pying the whole space between occipital and seventh labial. Eight 

 superior labials, fourth and fifth in orbit ; nine inferiors ; geneial 

 pairs subequal. Gastrosteges 128; urosteges, 62 -f (the end lost, 

 at least fifteen urosteges wanting). 



Color brown above, blackish along the sides throughout, up to 

 the middle of the fifth row of scales, then a very bright brown, 

 commencing abruptly and shading to a deeper brown on the me- 

 dian region of the back. The light margin becomes a white line 

 on the anterior fifth of the length, which extends to the orbit. 

 Upper lip and throat light yellow, rest of inferior surfaces, dark 

 crimson; a black dot on the end of each gastrostege. Scales 

 dusted with black. Length restored? 15.5 inches; to vent, 10 

 inches. 



This serpent is allied to the D. tseniatus of Peters (Monatsbe- 

 richte, Berl. Ac. 1863, 275), from Mexico. 



NOTHOPSIS RUGOSTJS, Cope, gen. et sp. nov. 



Teeth on all of the usual bones of the mouth, wanting on the 

 premaxillary. Maxillary teeth of equal lengths, entire. Head 

 flat, oval, moderately distinct; body and tail compressed. Uros- 

 teges in two rows, anal shield entire, gastrosteges narrow, angu- 

 late, the ends crossed by a longitudinal groove; pupil round. 

 Head covered with small scales above, except a pair of internasals 

 in contact with nasals and rostral; an isolated median frontal, 

 and a pair of small oval occipitals, each also entirely surrounded 

 by small scales. A single nasal pierced by the nostril; loreals 



18T1.] PART II. — 14 



