270 MR. G, A, BOULENQER ON THE 



Synopsis of the Sj'X'cies. 



I. No subociilar ; ocular in contact with two or three upper labials. 



A. Ilostral not move than one-third width of head ; nasal completely divided 



into two ; diameter of body 35 to 50 times in total length. 



20 scales round middle of body ; eyes distinct ; anterior part of 



nasal extending; to upper surface of head T. Iramimis. 



18 scales round middle of body ; eyes hidden T. crecatiis. 



22 scales roiiiid middle of body ; eyes just distinguishable ■ T. lencosticins. 



B. Rostral at least half width of head. 



1. Nasal completely divided into two: praeocular much narrower than the 



ocular; eyes distinct. 

 18 or 20 scales round middle of body, the diameter of which is 



36 to 49 times in total length T. eUgans. 



24 scales round middle of body, the diameter of which is 66 



times in total length T. decorosus. 



2. Nasal incoinpletely divided : snout (seen from above) rounded. 

 a. Eyes hidden. 



28 scales round middle of body, the diameter of which is 

 39 to 40 times in total length ; praeocular much narrower 

 than ocular T. lafesii. 



28 scales round middle of body, the diameter of which is 19 

 times in total length; praeocular much narrower , than 

 ocular _......_ T. hallowelli. 



21 scales round middle of body, the diameter of which is 53 



times in total length ; prteocular nearly as broad as ocular. T. Ivchhnlzi. 



h. Eyes distinguishable ; 24 to 30 scales round middle of body. 



Diameter of body 41 to 45 times in total length ; praeocular a 



little narrower than ocular T. nfeinliaim. 



Diameter of body 21 to 32 times in total length ; praeocular 



much narrower than ocular T. ivinctafm;. 



3. Nasal completely divided ; praeocular as large as ocular ; snout (seen from 



above) pointed ; eyes hidden ; tail without terminal spine. 



Snout obtu.sely pointed ; 22 scales round middle of body, the 



diameter of wh ich is 54 times in total length T. crossi. 



Snout obtusely pointed ; 20 scales round middle of body, the 



diameter of which is 51 times in total length T.fece. 



Snout acutely pointed ; 22 scales round middle of body, the 



diameter of which is 62 to 66 times in total length T. principis. 



II. A subocular separates the ocular from the upper labials ; eyes hidden. 



18 scales round middle of body, the diameter of which is 35 to 

 45 times in total length ; snout rounded ; rostral ^ width 

 of head; no caudal spine T. zenl-eri. 



20 scales round middle of body, the diameter of which is 70 

 times in total length ; rostral large, with obtuse horizontal 

 edge; a .small caudal spine T. rvfesce7is. 



22 scales round middle of body, the diameter of which is 60 to 



74 times in total length ; rostral large, with sharp horizontal 



edge; a small caudal spine T. ccecns, 



28 scales round middle of body, the diameter of which is 55 to 

 70 times in total length ; rostral large, with sharp horizontal 

 edge ; no caudal spine T. neirfonii. 



1. Typijlops braminus Daiul. 



Bouleng. Cat. Sn. i. p. 16. 



Soutliern Asia ; islands of the Indian Ocean ; South Africa ; 



