Cope.l Xo4: [Dec. 19, 



VII. Uppek Beni River, Bolivia ; Heath. 



The collection describecl below, was made by Dr. Edwin R. Heath 

 during his explorations of the Upper Beni river in Bolivia. The country- 

 through which Mr. Heatli passed had not been previously examined by 

 any naturalist, hence considerable interest attaches to this collection. 



Dermophis crassus, sp. nov. 



The most robust species of the genus. Tentacular fossa near to but 

 distinct from the eye, halfway between canthus oris and nostril. Annuli 

 95, all complete except the first, which is not complete above ; the third and 

 fourth not complete below ; and 94th and 95th, which are incomplete 

 above. General form depressed. Width of head at first fold, equal length 

 from same point. Length, mm. 42.3 ; width, 23 mm. or J^i/. Color black 

 above and below ; the plicae when opened, white within. 



The number of plicae is smaller than in any other species, and the form 

 is more robust. Two specimens, besides a third from Eastern Peru, 

 obtained by Professor Jas. Orton. 



Mabtjia AGiLis Raddi. 



DiPLOGLOSSUS FASCIATUS FitZ. 

 AMPHISB.a:NA BENIENSIS, Sp. nov. 



Of the group to which A. pretrei, A. vermicularis, A. angustifrons and 

 A. ocddentalis belong. Muzzle moderately elongate, obtuse ; rostral plate 

 a little visible from above. Nasofrontals broader than long, with nearly 

 straight borders. Prefrontals longer than wide, with the posterior angle 

 a little less than right. Frontals small ; forming together a pentagon, 

 each bounded posteriorly by a single small square parietal. One diamond- 

 shaped ocular, showing the eye indistinctly in its anterior angle. Labials 

 \ ; the last one above and last two below, small ; the latter pair not 

 strongly separated. First superior labial longer than high ; second higher 

 than long ; third longer than high, and separated from the ocular by a 

 larger scute. Symphyseal scute subquadrate and truncate behind, 

 bounded laterally by the first inferior labial only. Postsymphyseal 

 nearly square, bounded laterally by the second inferior labial only. It is 

 followed by two square scuta, each of which is bounded laterally by a 

 large plate, Avhich bounds the third inferior labial below. 



Tail with sixteen annuli ; preanal plates eight, or if the full extent of 

 the fissure be considered, by ten plates. Preanal pores six. Total length 

 335 mm. ; of head to canthus oris, .012 ; of tail, .025 M. Color .above, 

 light reddish brown ; below yellow. 



The scutellation of the head of this species distinguishes it from all the 

 species named. The tail is as short as in the A. angustifrons Cope (Pro- 

 ceed. Acad. Philada., 1861, p. 76). See below, in synopsis of Amphisbaena. 



Aporophis conirostris Gtinth. 

 A variety in which the dark, transverse dorsal marks are interrupted on 



