208 PROCEEDINGS OF THE ACADEMY OF 



BOTHRIOPSIS, Peters. 

 Monatsber. Preuss. Acad., 1861, 359, emendatus. 



The species of this genus are all of terrestrial habits, and ap- 

 proach, in this respect, the Ancisb-odontes. They have a more 

 extended range than anj^ of the preceding, occurring from the 

 upper or Peruvian Amazon to northern Mexico. They are very 

 venomous, but not so much dreaded as the true T7'igonocephali 

 of the same regions, which attain a larger size. 



a. Superciliary shield wide. 



Scales in 21 rows, two inferior smooth ; canthus rostralis with two scales 

 only ; two rows below eye ; a series of brown dorsal rhombs. 



B. GODMANII. 



Scales in 33 rows ; rostral a narrow vertical parallelogram ; three scales 

 on canthus ; 2-3 rows below orbit. Light, with twenty-one or fewer 

 broad brown crossbars, alternating on each side ; mouth black. 



B. BRACHYSTOMA. 



Similar, but with forty quadrate spots on each side the middle line, with 

 two rows of spots below them on each side. B. ophryomegas. 



B. CASTELNAVI. 



aa. Supercihary shields very narrow. 

 B. No small scales surrounding rostral. 



Scales in 23 ("25") rows, three inferior smooth; small scales on canthus, 

 four rows below eye ; rostral broad as high ; nine superior labials, fourth 

 largest. Twenty -two dorsal rhombs. B. affinis. 



SB. Rostral separated from nasals by small scales. 



Scales in 25 rows ; rostral triangular, broader than high ; small scales on 

 canthus, five rows below eye; 10-11 superior labials. A series of large 

 dark brown dorsal rhombs. B. mexicanus. 



Bothriopsis godmannii, GUnther {Bothechis). Am. Mag. N. H., 1863, nov. pi. vi., 

 f. G. Botlirops hrammianus, Bocourt, Ann. Sci. Nat., 1868, p. 201. 



Vera Paz and Guatemala. 



Bothriopsisbrachystoma, Cope, Proc. Acad. Nat. Sci., Phila., 1861,295 (Bothtechis) . 

 B. castehiavi, var. hrackystoma, 1. c. 1859, 339. 



Guatemala. 



Bothropsis ophryomegas, Bocourt (Botliroijs, Bac). Ann. Sci. Nat., 1868, 201. 

 Central America. 



[October 24, 



