480 Annals of the South African Museum. 



1. GEREHOSAUEUS. 

 Wiegm. Isis, 1828, p. 378; Bouleng. Cat. Liz. iii. p. 120. 



Six Species in South Africa. 



I. Ventral shields in 14 or 16 longitudinal series ; tympanic 



shield large, crescentic ; 18 to 21 femoral pores on each side G. validtis. 

 II. Ventral shields in 10 longitudinal series ; frontonasal usually 



in contact with the rostral. 

 Tympanic shield narrow; 12 or 13 femoral pores on each side . . G. iinindin. 

 Tympanic shield large, crescentic ; dorsal shields unicarina.te ; 



15 to 18 femoral pores on each side (r. tijpkus. 



III. Ventral shields in 8 longitudinal series ; nasals usually in 



contact with each other behind the rostral. 

 Tympanic shield large, crescentic ; head (measured to ear) 4^ to 

 5^ times in length from snout to vent ; 14 to 18 femoral pores on 



each side (i. aitrilii^i. 



Tympanic shield narrow ; head 4^ to 5 times in length from 

 snout to vent in adult ; prsefrontals forming a long median 



suture ; 14 to 20 femoral pores on each side G. iiiffroliiwatuii. 



Tympanic shield narrow ; head 5 to 6^ times in length from 

 snout to vent in adult ; frontonasal usually in contact with 

 frontal, or prcefrontals forming a short suture ; 10 to 15 femoral 

 pores on each side G. fiavigularis. 



1. Gebrhosaurus validus, Smith, 111., Eept., App. p. 9 ; Bouleng., 



t.c, p. 121. 

 Transvaal, Ehodesia, Portuguese East Africa, Angola. 



2. Gerrhosaurus grandis, Bouleng. Ann. Natal Mus. i., 1908, 



p. 233, pi. xxxvi. 

 Zululand. 



3. Gerrhosaurus typicus. Smith, Mag. Zool. i., 1837, p. 143 ; 



Bouleng., t.c, p. 123. 

 North-western parts of Cape Colony. 

 Little Namaqualand (Peringuey). 



4. Gerrhosaurus auritus, Boettg. Ber. Senck. Ges., 1886-87, p. 148, 



pi. V. fig. 3. 

 Kalahari, Ovamboland, Angola. 



5. Gerrhosaurus nigrolineatus. Hallow. Proc. Ac. Philad., 1857, 



p. 49 ; Bouleng., t.c, p. 122. 

 Kalahari, Southern Ehodesia, Angola to Gaboon and Uganda. 

 Southern Ehodesia : Hunyani Eiver (Thomas) ; Victoria Falls 



(Kirkman). 



6. Gerrhosaurus flavigularis, Wiegm. Isis, 1828, p. 379 ; 



Bouleng., t.c, p. 122. 



