COLOMBIA^f BATRACHIANS AND REPTILES. 1037 



frontal as long as broad, nearly as long as its distance from the 

 end of the snout, much shorter than the pai'ietals ; nasal divided ; 

 loreal once and a half as long as deep, bordering the eye ; no 

 preeocular ; praefrontal entering the eye ; two postoculars, lower 

 very narrow ; temporals 3 + 3 ; eight upper labials, fourth and 

 fifth entering the eye ; four pairs of chin-shields, the anterior 

 very small and in contact with the symphysial, the second larger 

 a,nd a, little longer than broad. Scales in 15 rows, vertebrals 

 strongly enlarged, nearly as long as broad. Ventrals 208 ; anal 

 entire; subcaudals 132. Reddish brown above, with very large 

 blackish-brown blotches separated on the back by narrow inter- 

 spaces of the ground colour, these interspaces gradually widening 

 down the sides, where the blackish blotches are edged by small 

 white spots : these blotches form nearly complete rings on the 

 atiterior part of the body, whilst further back they are gradually 

 more widely interrupted by the yellowish-white colour of the 

 belly ; lower surface of tail brown, with a few small whitish 

 spots ; head uniform reddish brown above ; lips white, with 

 small black spots. " Iris golden." 



Total length 680 mm. ; tail 235. 



A single male specimen. 



Closely allied to L. annulata Gthr., from Costa Rica, and 

 L. temporalis "Werner, from Ecuador. 



42. Lachesis mutus L. 



This is the Bothrops acrochordus of Garcia *. Grows to 

 2 1 metres. 



43. Lachesis atrox L. 



44. Lachesis bionticellii Peracca. 



This Pit-Yiper, easily distinguished from L. lanceolatus by 

 the shape of the rostral shield, which is much deeper than broad, 

 was described along with Trachyhoa boulengeri from a specimen 

 of unknown origin. It is interesting to find the two snakes 

 associated in this collection. 



Two female specimens : — 



a. 920 mm. ; tail 160. Sc. 29 ; Y. 210 ; C. 86. 

 h. 570 mm.; „ 100. „ 27; „ 212; „ 87. 



Lachesis punctatus Garcia, I.e. p. 31, pi. — , perhaps represents 

 the same species. 



45. Lachesis brachystoma Cope. 



The range of this species is now known to extend from the 

 Isthmus of Tehuantepec to N.W. Ecuador. 



Described and figured by Garcia as Thanatophis sutus. 



* Los Ofidios venenosos del Cauca (Cali, 1896), p. 23, pi. — . 



Pkoc. Zool. Soc— 1913, No. LXIX. 69 



