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Show 16 DR. J. ANDERSON ON MAMMALS, REPTILES, [Jan. 5, palpebral disk, the number of scales round the middle of the body 52, the femoral pores being 10-10 in the first variation, and 11-10 in the second, whereas in m y specimens the scales round the body (including the ventrals) are 52-53, and the femoral pores are 11-14. In Mr. Boulenger's specimens with six scales in the palpebral disk, and with the collar distinct and attached in the middle, the femoral pores are 14-13, while in the above-mentioned specimen, with the same number of scales in the palpebral disk, there are only 11 femoral pores, associated with 53 scales (including the ventrals) round the body, whilst his specimens have 59 scales. Mr. Boulenger indicates another variation with 3 scales in the palpebral disk, 68 scales (including ventrals) round the body, and with 17-17 femoral pores. These facts attest the correctness of M . Lataste's opinion, which Mr. Boulenger shares, that no division of this species into subspecies or varieties can be made on characters derived from the palpebral disk and collar. Family VI. SCINCID^E. Genus MABUIA, Fitzinger. 16. M A B U I A VITTATA, Olivier ; Boulenger, loc. cit. p. 135. 1, Djebel Ahmer Khaddon, south of Constantine; 1, Biskra; 1, between Biskra and Tuggurt. The largest specimen is from the first-mentioned locality, and measures, from the snout to the vent, 75 millim., the tail 129. Genus EUMECES, Wiegmann. 17. E U M E C E S S C H N E I D E R I , Daudin; Boulenger, loc. cit. p. 136. 1 3 & 2 2 J Duirat, Tunisia. Genus SCINCUS, Laurenti. 18. S C I N C U S OFFICINALIS, Laurenti ; Boulenger, loc. cit. p. 137. 1 3, Sand-dunes, Debila, Sahara ; 1 3 & 3 5, Tuggurt; 1 3 & 3 2 i Duirat, Tunisia. In one of the specimens from Duirat there are 30 scales round the body, in the other 26-28. These specimens present two types of coloration, being either uniformly yellowish above or marked in addition with dark brown bars more or less continuous across the back, strongly or obscurely developed. Genus CHALCIDES, Laurenti. 19. C H A L C I D E S OCELLATUS, Forskal; Boulenger, loc. cit. p. 138. 11, Biskra; 1, Djebel Ahmar Khaddon, south of Constantine ; 6, Duirat, Tuuisia. The largest specimen is 116 millim. from the snout to the vent and, in one measuring 104 millim., the hind limb is 2 5 millim. The scales round the body vary from 28-32 in number, whereas those |