10. ACANTHODACTYLUS. 59 
Upper caudal scales’ strongly keeled; toes 
very feebly but symmetrically pectinate. 9. vulgaris, p. 67. 
Seales on the basal third of the tail per- 
fectly smooth ; toes very feebly pectinate 10. tristrami, p. 68. 
B. More than 10 ventral plates across the middle of the body. 
Ventrals in 14 to 18 longitudinal series, 
not broader than long; snout acute; the 
scales forming the digital pectination 
(fourth toe) at least as long as the dia- 
meter of the corresponding part of the 
POG eciiin wOnenee AAW eke ace 7. scutellatus, p. 64. 
Ventrals in 12 or 14 longitudinal series, the 
median broader than long; snout more 
obtuse; the scales forming the digital 
pectination shorter than the diameter of 
the corresponding part of the toe...... 8. pardalis, p. 65. 
1. Acanthodactylus boskianus. 
Acanthodactylus boskianus, Gray, Cat. p. 38. 
Lacerta boskiana, Daud. Rept. iii. p. 188, pl. xxxvi. fig. 2; Leche. 
Verz. Doubl. Mus. Berl. p.103; Aud. Deser. Egypte, Rept., Suppl. 
p. 178, pl. i. fig. 9. 
aspera, Aud. 1. ¢. p. 174, pl. i. fig. 10. 
Acanthodactylus boskianus, Wicomn Herp. Mev. p. 10; Dum. & 
Bibr. v. p. 278; Strauch, Erp. Alg. p. 38; Bouleng. Bull. Soc. 
Zool. France, 1878, p. 182, and Proc. Zool. Soc. 1881, p. 744, 
pl. lxiii. fig. 2; Eimer, Arch. f. Nat. 1881, pl. xv. fig. 26; Lataste, 
Ann. Mus. Genov, (2) ii, 1885, p. 496. 
Scapteira ineequalis, Gray, Ann. N. H. i. 1838, p. 280. 
Acanthodactylus asperus, Bonap. Faun. Ital. 
Snout obtuse. Four supraoculars, the fourth very seldom broken 
up into small scales; subocular not reaching the lip; temporals 
smooth or more or less strongly keeled; front edge of the ear 
usually distinctly denticulated. Dorsal scales strongly keeled, very 
much larger on the hinder part of the back than between the 
shoulders and on the flanks, rhomboidal, strongly imbricate; 10 to 
14 (seldom 16, according to Lataste) large keeled scales on a 
transverse line between the hind limbs. Ventral plates considerably 
broader than long, in straight longitudinal and transverse series; 
10 (seldom 12) plates across the middle of the body. A median 
series of broad preanal plates, posterior largest. The hind limb 
reaches the shoulder, the ear, or the eye. Digital denticula- 
tions strong, usually shorter than the corresponding diameter of 
the toe, much more developed on the outer than on the inner edge 
of the fourth toe. Upper caudal scales strongly keeled; the scales 
under the base of the tail smooth or obtusely keeled. Young with 
whitish longitudinal lines separated by blackish interspaces with 
