228 Lacerfichv. 



Uliper head-shields finely striated ; subocular not reaching the 



mouth ; 20 to 24 femoral pores on each side . 9. E. brenneri, Peters, p. 254. 



Section III. T.i;NiEREMiAs, Blgr. — Three nasals, the lower and the posterior 



resting on the first upper labial ; ventral plates in 10 straight longitudinal 



series ; no occipital ; toes feebly compressed, with tricarinate lamellae inferiorly. 



— West Africa. 



60 smooth scales across middle of body ; 2 1 femoral pores on 



each side . . . . . . 10. E. (juineensis, Blgr., p. 256. 



Section IV. Mesalina, Gray. — Thi-ee nasals, the lower in contact with the 

 rostral and the first (very rarely first and second) upper labial ; ventral plates 

 in 10 to 18 (exceptionally 8) straight longitudinal series, rai-ely irregular 

 or tessellated ; occipital usually present ; toes feebly compressed, with bi- or 

 tricarinate lamellje inferiorly. — Africa and S.W. Asia. 



A. North African and Asian sj^ecies. Collar curved c^r angular, sometimes 



distinct on the sides only. 



1. Nasals in contact behind the rostral; 32 to 62 scales across middle 



of body; 9 to 17 femoral pores on each side. 



Head aird body rather strongly depressed, limbs moderately 

 slender; head Ij to If times as long as broad; occipital 

 present, nearly always in contact with the interparietal 

 or separated from it by a small shield ; ventral plates in 

 10 (rarely 8) longitudinal series ; scales on upper surface 

 of tibia keeled 11. E. guthdata, liicht., y. 258. 



Head and body strongly depressed, limbs very slender ; head 

 Ij times as long as broad; occipital absent or minute and 

 not in contact with interparietal ; ventral plates in 10 

 longitudinal series ; scales on upper surface of tibia smooth 

 or obtusely keeled . . . . 12. E. adramitana, Blgr., p. 271. 



Habit rather stout ; head not sti-ongly depressed, 14 to 

 1^ times as long as broad; occipital absent or minute 

 and not in contact with interparietal ; ventral plates in 

 12 (rarely 10) longitudinal series ; scales on upper surface 

 of tibia smooth or obtusely keeled . 13. E. brevirosti-is, Blanf., p. 273. 



2. Kostral often in contact with frontonasal ; 53 to 67 



scales across middle of body ; occipital present ; ven- 

 tral plates in 12 (rarely 10 or 14) longitudinal series : 

 13 to 22 femoi'al pores on each side. 



14. B. rulropnnrtalii, Licht., p. 276. 



B. South African species. Collar straight aud perfectly free. 



1. A narrow tympanic shield ; ventral plates in 10 or 12 longitudinal 

 series ; i to 4 of the lateral border of the frontal in contact 

 with the two large sujiraoculars ; nasals in contact behind the 

 rostral. 

 Lower eyelid semi-trauspareut, with 10 to 12 enlarged scales 

 in the middle, one of which may be much larger than the 

 others; 47 to 65 scales across middle of body; ventral plates 

 in 12 (rai'ely 10) longitudinal and 2S to 33 transverse series. 



15. E. namaqueusis, D. & B., p. 280. 



