SNAKES OF KORTH-EAST AERICA. 645 



Scales in 21 rows; veiitrals 174-198; anal entire; subcaudals 36- 



41 ; a deep groove above 5th and 6th upper labials Fseudohoodou. 



2. Pupil vertically elliptic. 



«. Anal entire; a single anterior temporal. 



Scales smooth, in 21-33 rows JBoodon. 



Scales smooth, in 17 rows Li/cophidium. 



Scales strongl}' keeled, vertebials bicarinate Simoceplialus. 



h. Anal divided. 



Scales in 21 rows ; ventrals 216 ; subcaudals 67-70 Aeluroglena. 



Scales in 19 rows; ventrals 160-188; subcaudals 35-46; rostral 



angularly bent, detached at the sides Lytorhynchus. 



3. Pupil round ; scales in 15-23 rows ; ventrals 150 or more, or, if less, 



subcaudals 100 or more ; loreal not more than twice as long as deep. 



a. One or two suboculars below the prseocular ; frontal 



not twice as long as broad Zamenis. 



b. No subocular ; frontal not twice as long as broad. 

 Scales in 15 rows; ventrals 150-193; subcaudals 77-123, without 



a keel Chloropliis. 



Scales in 15 rows ; ventrals 166-207 ; subcaudals 112-157, with a 



strong keel Fhilothamnus. 



Scales in 21 rows ; ventrals 176-224 ; subcaudals 63-88 Coronella. 



c. No subocular ; frontal at least twice as long as broad ; 



scales in 15 rows ; ventrals 130-143 ; subcaudals 



100-128 Grai/ia. 



]5. Ej'e separated from the upper labials by a series of sub- 

 oculars ; snout with angular horizontal edges ; scales in 

 19-25 rows Scaphiophis. 



II. Nostril in a single or semidivided nasal. 

 J5. Scales smooth, in 15 rows. 



1. Nasal semidivided, with a longitudinal cleft behind the nostril ; internasal 



and prefrontal single. 



Rostral with angular horizontal edge Frnst/mna. 



Rostral with obtuse horizontal edge Asthenoph is. 



2. Nasal entire ; internasal and prsefrontal i^aired. 



Ventrals 162 ; anal divided; subcaudals 69 Contia. 



Ventrals 113-144; anal entire; subcaudals 19-46 TLomalosoma. 



B. Scales strongly keeled, in 23-27 rows ; no loreal Dasi/peltis. 



1. Tropidonotus. 



Kuhl, Bull. He. K"at. ii. 1824, p. 81 ; Bouleng. Cat. Sn. i. 

 p. 192. 



1. Tropidonotus olivaceus. 



Coronella olivacea Peters, Mon. Berl. Ac. 1854, p. 622. 

 Tropidonotus olivaceus Bouleng. t, c. p. 227. 

 Tropical Africa,, from the Soudan to Angola, Damaraland, and 

 Southern Rhodesia. 



2. PSEUDOBOODON. 



Peracca, Boll. Mus. Torin. xii. 1897, no. 273, p. 1 . 



1 . PsEUDOBOODON GASC.*:. 



Peracca, t. c. p. 2, fig. 



Lamprophis ab>/ss(nicns ]Moci|uard. Bull. Mus. Paris. 1906. 

 p. 249. 



ErvtJirea. Altvssinia, 



