194. RaiNOOALAMTTS. 195. XENOCAtAMUS. 247 



194. RHINOCALAMUS. 

 Ehinocalamus, Ounth. Ann. Sf Mag. N. H. (6) i. 1888, p. 322. 



Maxillary very short, with four teeth graduaUy increasing in size 

 and followed, after an interspace, by a pair of large grooved fan^s 

 situated below the eye ; anterior mandibular teeth slightly enlarged • 

 palate toothless. Head small, not distinct from neck ; snout much 

 depressed and very prominent; rostral very large, with obtuse 

 horizontal edge, concave below; eye minute, with round pupil; 

 nostril in a semidivided nasal; no loreal; no praeocular; no anterior 

 temporal. Body cylindrical; scales smeoth, without pits, in 

 17 rows ; ventrals rounded. Tail very short, obtuse ; subcaudals 

 in two rows. 



East Africa. 



1. Rhinocalamns dimidiatus. 

 Rhinocalamua dimidiatus, Cfiinth. I. c. pi. xix. fig. 0. 



Eostral very large, capping the end of the snout, the portion 

 visible from above longer than its distance from the frontal ; inter- 

 nasals more than twice as broad as long, shorter than the prse- 

 frontals ; frontal large, a little longer than broad, as long as or a 

 little longer than its distance from the end of the snout, as long as 

 or a little shorter than the parietals ; supraocular very small ; a 

 minute postocular ; a single temporal ; six upper labials, third in 

 contact with the nasal and the prsefrontal, third and fourth entering 

 the eye, fifth largest and in contact with the parietals ; four lower 

 labials in contact with the anterior chin-shields, fourth very large 

 and narrowly separated from its fellow by the posterior chin-shields. 

 Scales in 17 rows. Ventrals 192-215; anal divided; subcaudals 

 20-27. Black above ; upper lip, three lower rows of scales, and 

 lower parts white. 



Total length 470 millim. ; tail 30. 



Interior of East Africa. 



a-c. cJ (V. 202, 196, 192 ; 0. 26, 26, 27). Mpwapwa. (Types.) 

 rf-e. S (V. 207; 0. 25) & ? (V. 215; Ugogo. Mr. Baxter [C.l. 



0.20). 



195. XENOCALAMUS. 



Xenocalamus, Gunth. Ann. Sf Mag. N. H. (4) i. 1868, p. 414, and 

 (6) XV. 1895, p. 526. 



Maxillary very short, with five teeth gradually increasing in size 

 and followed, after an interspace, by a pair of larger grooved fangs 

 situated below the eye ; anterior mandibular teeth a little larger 

 than the posterior ; palate toothless. Head small, not distinct 

 from neck ; snout much depressed, very prominent, pointed ; rostral 

 very large, with obtuse horizontal edge, flat below ; eye minute, 

 with round pupil ; nostril between two nasals, the posterior very 

 large ; no loreal ; praefrontals absent (fused with the frontal) ; no 



