^^<>0 MR. U. A. BOULENGER ON 



prsefrontaLs, the largest head-shields, the suture between them 

 once and a half to once and two-thirds as long as that between 

 the nasals and slightly longer than that between the frontals, 

 which are much smaller and a little longer than broad * ; 

 a pair of small occipitals ; eye distinguishable under the ocular, 

 which is situated between the prtefrontal and the second and 

 third upper labials and followed by two superposed postoculars ; 

 four upper labials, fourth small, second very large ; symphysial 

 trapezoid, the sides slightly concave, followed by a longer chin- 

 shield ; four lower labials, second largest. 213 or 214 annuli on 

 the body, 21 to 23 on the tail ; an annulus in the middle of the 

 body contains 34 or 36 segments, 16 or 18 dorsal and 18 ventral, 

 the dorsals at least twice as long as broad, the median ventrals 

 once and a half to twice as broad as long ; the dorsal segments on 

 the distal half of the tail tubercular or subconical. Lateral line 

 very distinct. 6 anal segments. 4 prseanal pores. Whitish, 

 each dorsal segment with an oval or squarish purplish-brown 

 spot. 



Length to vent 320 mm. ; tail 28 ; diameter of body 10. 



Two specimens from Anda Goya, at the junction of the E. 

 Condoto and 8an Juan. 



Distinguished from A. dcm-ivini D. & B. by the broader ven- 

 tral segments and the tubercular segments on the tail. 



Herpbtodryas vicinus, sp. n. (Text-fig, 2.) 



Eye large, as long as the snout. Rostral once and one-third 

 as broad as deep, iust visible from above ; intei-nasals a little 

 broader than long, a little shorter than the pi'a?frontals ; frontal 



Text-tiii'ure "2. 



Herpetodryas vicinus. Side view of head. 



once and a half as long as broad, longer than its distance from 

 the end of the snout, slightly shorter than the parietals ; loreal 

 as long as deep ; one praj- and two postoculars; temporals 2-|-2 ; 

 nine upper labials, fourth, fifth, and sixth entering the eye; 

 five lower labials in contact with the anterior chin-shields, which 

 are shorter than the posterior. Scales in 10 rows, all smooth or 

 the vertebral pair very faintly keeled ; scales gradually decreas- 

 ing in size towards the ventrals, the largest not half the size of 

 the parietal shields. Yentrals not angulate laterall}^ 163 ; anal 



* In tlic specimen ligured the left frontal has fused with the left occipital. 



