620 MR. G, A. BOULENGER ON THE 



Pra30cular extending to upper surface of head ; scales in 23 (rarelj' 

 25) rows ; veiitrals 186-220 ; belly blackish brown with the 

 jiiiddle line yellowish S. virgatns. 



Prseocular extendins; to upper surface of head; scales in 25 to 33 



rows; ventrals 188-249 B. lineatns. 



II. Subcaudals single ; scales in 25 to 29 rows : ventrals 183-221... B. olivaceus. 



1. BooDON iNFERNALis GUnth. Oat. Col. Sii. p. 199 ; Bouleng. 

 Cat. Sn. i. p. 330, pi. xxi. fig. 1. 



German East Africa and South Africa. 



2. BOODON VIRGAXUS. 



Ccelopeliis virgata Hallow. Proc. Ac. Philad. 1854, p. 98. 

 Boodon virgaUts Bouleng. t. c. p. 331. 



German East Africa {Jide Sternfeld) ; West Africa, from the 

 Gold Coast to Calabar. 



3. Boodon lixnteatus Dum. & Bibr. Erp. Gen. vii. p. 363 ; 

 Bouleng. t. c. p. 332. 



Tropical and South Africa and South Arabia. 



4. Boodon olivaceus. 



Holuro'pholis olivaceus A. Dum. Rev. et Mag, Zool. 1856, 

 p. 466. 



Boodon olivaceus Bouleng. t. c, p. 335. 



West and Central Africa, from Nigeria and Uganda to the 

 Congo. 



5. Lycophidium. 



Dum. k Bibr. Mem. Ac. Sc. xxiii. 1853, p. 462 ; Bouleng. Cat. 

 Sn. i. p. 336. 



Synopsis of the Species. 



I. Scales in 15 rows ; ventrals 153-165 ; subcaudals 23-32 ... L.meJeagris. 



II. Scales in 17 rows. 



A. Parietal shields longer than the distance between frontal and end of snout. 

 Diameter of eye hardly equal to its distance from mouth ; ventrals 



140-150; subcaudals 18-28 L. acutirostre. 



Diameter of eye considerably greater than its distance from 



mouth; ventrals 146-156 ; subcaudals 20-30 L. semiannulis. 



Diameter of eye considerably greater than its distance from 



mouth ; ventrals 163-208 ; subcaudals 21-47 L. capense. 



Diameter of eye not greater than its distance from mouth ; 



ventrals 164-189 ; subcaudals 29-33 L.Jacksonii. 



B. Parietal shields not longer than distance between frontal 



and end of snout; ventrals 188-219; subcaudals 



34-55 I'- semicinctnm, 



1. Lycophidium meleagris Bouleng. Cat. Sn. i. p. 337, pi. xxi. 

 fig. 2. 



German East Africa {Jide Sternfeld) ; Angola. 



2. Lycophidium acutirostre Giinth. Ann. & Mag. N. H. (4) i. 

 1868, p. 427, pi. xix. fig. D; Bouleng. t. c. p. 338. 



Zanzibar. 



