216 MR. G. A. BOULENGER ON 



1. Hypoptophis wilsonii Bouleng. 1. c. 

 Michellia katangce L. Miiller, 1. c. 

 Congo (Kasai Province and Katanga). 



18. Aparallactus. 



A. Smith, 111. Zool. S. Afr., Rept., App. p. 15 ; Bouleng. Cat. 

 Sn. iii. p. 255. 



Synopsis of the Species. 



I. Third and fourth upper labials entering the eye. 



A. Subcaudals 49-59 ; nasal divided. 



First lower labial in contact with its fellow behind the sym- 



physial ; frontal as long as parietals A. lunulatus. 



Symphysial in contact with the anterior chin-shields ; frontal 

 a little shorter than parietals A. guentheri. 



B. Subcaudals 35-53 ; nasal entire ; symphysial in contact with the 



chin-shields. 



Ventrals 175-191 A. bocagii. 



Ventrals 138-166 A. capensis. 



C. Subcaudals 38-40; nasal divided; first lower labial in contact with its 



fellow behind the symphysial. 



1. Frontal a little longer than broad. 



Sixth upper labial not in contact with the parietal A. dolloi. 



Sixth upper labial forming a short suture with the parietal... A. ubangensis. 

 Sixth upper labial forming a long suture with the parietal ... A.flavitorques. 



2. Frontal nearly twice as long as broad A. congicus. 



II. Second and third upper labials entering the eye; nasal 



entire; symphysial' in contact with the anterior chin- 

 shields; subcaudals 36-41 A. punctatolineatus. 



1. Aparallactus lunulatus. 



Uriechis lunulatus Peters, Mon. Berl. Ac. 1854, p. 623. 

 Aparallactus lunulatus Bouleng. t. c. p. 258. 

 Eastern Central Africa (L. Tanganyika, N. Rhodesia, and 

 Nyassaland) and Mozambique. 



2. Aparallactus guentheri Bouleng. Ann. & Mag. 1ST. H. (6) 

 xvi. 1895, p. 172, and Cat. Sn. iii. p. 259, pi. xi. tig. 2. 



Angola, Central and East Africa. 



3. Aparallactus bocagii Bouleng. tt. cc. pp. 173, 259. 

 Angola. 



4. Aparallactus capensis A. Smith, 111. Zool. S. Afr., Rept., 

 App. p. 16 ; Bouleng. Cat. Sn. iii. p. 259. 



Katanga, East and South Africa. 



5. Aparallactus dolloi Werner, Verh. zool.-bot. Ges. Wien, 

 Hi. 1902, p. 346. 



Ubanghi. 



