Fishes and Reptiles from South A nerlca. 287 



is most nearly rel ated to Z^. /'<W«r, Stdr., which is readily 

 distinguished by tlie sliorter barbels and the longer camlal 

 peduncle. 



Reptiles. 

 Amphishcena Silvestrii. 



Snout rounded, prominent. llostral large, pentagonal, 

 visible from above; nasals forming a suture behind the 

 rostral; a pair of largo prsefrontals and a pair of smaller 

 frontals ; suture between the praifrontals as long as that 

 between the frontals and twice as long as that between the 

 nasals ; a pair of shields forming a short suture behind the 

 frontals, followed by a pair of smaller shields forming a 

 longer suture ; eye distinct through the ocular, which is in 

 contact with the second and third labials; no proeacular ; a 

 square postocular ; four upper labials, fourth small and sepa- 

 rated from the postocular by one shield; symphysial tetra- 

 gonal, followed by a large heptagonal median chin-shield; 

 three lower labials, second largest ; a large chin-shield on 

 each side, just touching the median chin-shield and forming 

 a suture with the second and third labials. 175 annuli on the 

 body and 22 on the tail ; the segments of these annuli longer 

 than broad on the back, those of the two median ventral series 

 twice to thrice as broad as long ; on tlie middle of the body 

 each annulus is formed of 22 segments, 10 above and 12 

 below the lateral grooves, which are perfectly distinct. 

 Four anal segments ; only two prteanal pores. Tail rounded 

 at the end. Segments brown, edged with white, the white 

 edge broader on the belly than on the back ; end of snout 

 and lower surface of head white. 



Length to vent 130 millim. ; tail 20 ; diameter of body 5. 



A single specimen of this very distinct species was obtained 

 at Cuyaba. 



Philodryas subcarinatus. 



Diameter of eye § length of snout ; latter rounded, feebly 

 prominent. Rostral as deep as broad, its upper portion half 

 as long as its distance from the frontal ; internasals shorter 

 than the prefrontals ; frontal once and a half as long as 

 broad, a little longer than its distance from the end of tlie 

 snout, shorter than the parietals ; loreal a little longer than 

 deep; one j)rai0cular, narrowly separated from the frontal; 

 two postoculars ; temporals 1 + 3 ; eight upper labials, fourth 

 and titth entering the eye ; five lower labials in contact with 

 the anterior chin-shields, which are longer than the posterior. 



20* 



