1. nBLMINTIlOPlIIS. 5 



II. Prajfrontals separated, the rostral forming a suture with the 

 frontal. 



Eye under the ocular, which is separated 

 from the labials by a subocular; two 

 superposed pra^oculars 3. petersii, p. 6. 



Eye under the ocular, which is in contact 

 with the third upper labial ; a single 

 praeocular ... 4. gnentJieri, p. G. 



Eye under the suture between the pra3- 

 frontal and the ocular, which is sepa- 

 rated from the labials by a subocular. . 5. alhirostris, p. 6. 



1. Helminthophis flavoterminatus. 



Typhlops flavoterminatus, Peters, Mon. Berl. Ac. 1857, p. 402, and 

 " Arch.f. Nat. 1862, p. 43 ; Giinth. Tr. R. Soc. Mauritius, iv. 1870, 



pp. 63, 139. 

 Idiotyphlops flavoterminatus, Jan, II. cc. Icon. 1. 1, pis. v. & vi. 



tig. 10 (1860). 

 Helminthophis flavoterminatus, Peters, Sitzb. Ges. naturf. Fr. 1881, 



p. 69. 



Rostral not half the width of the head, not extending to the level 

 of the eyes, separated from the frontal by the pnrfrontals, which 

 form a suture with each other ; frontal broad ; two superposed prae- 

 oculars and a subocular ; eye distinguishable under the ocular ; 

 four upper labials, first largest, third in contact with the ocular. 

 Diameter of body 50 to 60 times in the total length ; tail as long 

 as broad or a little longer than broad, rounded. 24 scales round 

 the body. Brown, each scale darker in the centre ; head and tail 

 yellow. 



Total length 300 millim. 



"Venezuela. 



a-c. Ad. & hgr. Venezuela. Dr. Seaman [P.]. 



d-e. Ad. Caracas. Dr. Ernst [Pj. 



/, ff. Ad. & hgr. Caracas. 



h. Ad. Rio Juan. 



i. Ad. Mauritius (imported). L. Bouton, Esq. [P.]. 



2. Helminthopliis frontalis. 



Typhlops (Helminthophis) frontaUs, Peters, Mon. Berl. Ac. 1860, 



p. 517, pi. — . tig. 1. 

 Helminthophis frontalis, Bocourt, Miss. Sc. Mefx., Rept. p. 502, 



pi. XXX. tig. 2 (1882). 



Rostral not half the width of the head, not extehding to the level 

 of the eyes, separated from the frontal by i\\e prajfrontals, which 

 form a suture with each other ; frontal broad ; a single pneocular 

 and two suboculars ; eye distinguishable under the ocular, which is 

 very small ; four upper labials, fii-st largest. Diameter of body 



