286 mr. g. a, boulenger on the 



1. Dasypeltis SCABRA. 



Coluber scaber Linn. S. IST. i. p. 384. 



Dasypeltis scabra Bouleng. t. c. p. 354. 



From Sieira Leone and Egypt to the Cape of Good Hope. 



2. Dasypeltis macrops Bouleng. Ann. k Mag. N. H. (7) xix. 

 1907, p. 324. 



Cameroon. 



B. Opisthoglypha. 



I. E3e moderate or large ; head more or less distinct from neck ; loreal present. 



A. Pupil verticall}' elliptic ; head short, much broader than neck. 



1. Subcaudals in two rows. 



Vertebral scales not enlarged ; scales in 19 to 23 rows ; two 



superposed anterior temporals Tarhophis. 



Vertebral scales not enlarged ; scales in 17 or 19 rows ; a single 



anterior temporal Lepfodira. 



Vertebral scales enlarged : scales in 19 to 25 rows Dipsadomorplnis. 



2. Subcaudals single ; scales in 17 or 19 rows Dipsadoboa. 



B. Papil round, exceptionalh^ vertically subelliptic. 



1. Scales not oblique, in 17 or 19 rows ; loreal not longer than deep. 



Scales keeled ; anal entire : a single anterior temporal Geodipsas. 



Scales grooved in the adult ; anal divided ; two loreals ; frontal 



at least twice as long as broad Caelopeltis. 



Scales smooth ; anal divided ; frontal about twice as long as 



broad SJiampJiiopIi is. 



2. Scales more or less oblique, in 15 or 17 (rarely' 19) rows, smooth : loreal 



at least 1| times as long as deep ; rostral not or but little lu'oader than 

 deep. 



Frontal, in the middle, not or but slightly narrower than supra- 

 ocular ; a single anterior temporal Dromopliis. 



Frontal, in the middle, narrower than supraocular ; usually two 



superposed anterior temporals FsammopJns. 



3. Scales not oblique, in 19 to 25 rows, smooth ; loreal at 



least 1| times as long as deep : rostral at least twice 



as broad as deep Macvoprotodon. 



4. Scales very oblique, very narrow, in 19 or 21 rows, 



more or less keeled ; nostril in an undivided nasal ... DispJioJidns. 



C. Pupil horizontal ; scales narrow, obliqiie, feebly keeled, 



in 19 rows; nostril in an undivided nasal Thdotornis. 



II. Ej^e small or very small ; head not at all distinct from neck ; no loreal : scales 



in 15 or 17 rows, not oblique. 



A. Subcaudals in two rows. 



l^fasal in contact with rostral ; 5tli upper labial in contact with 



parietal; scales in 17 rows ; ventrals 173-208 Calamelaps. 



First labial in contact with internasal ; no labial in contact 



with parietal ; scales in 15 rows ; ventrals 180-249 Iliodon. 



First labial in contact with internasal ; 5th upper labial in 



contact with parietal ; scales in 15 rows ; ventrals 296 ... JSlapocalamun. 



B. Subcaudals single; one or two upper labials in contact with parietal. 



First labial in contact with internasal Folcmou. 



Nasal in contact with rostral ; posterior maxillary teeth large 



and strongly grooved AparaJlactns. 



Nasal in contact with rostral ; posterior maxillary teeth feebly 



enlarged and feebly grooved JSlapops. 



