180 Lacertidie. 



Head-shields normal, but occipital sometimes absent. 

 ^Nostril pierced between an upper and a lower nasal and 

 a postnasal. Lower eyelid scaly. Collar absent; a 

 short fold in front of the arm. Back covered with large 

 rhombic or lanceolate, strongly keeled and imbricate 

 scales ; ventral plates smooth, imbricate. Digits feebly 

 compressed, with sharply keeled lamellae inferiorly. 

 Femoral pores. Tail long, cylindrical. 



Tropical and South Africa. 



The parietal foramen and pterygoid teetli are present. 



This genus maj be regarded as derived from Troiddosaura, differing 

 only in the keeled subdigital lamellae combined Tvith the presence of a 

 subnasal separating the nasal from the first upper labial ; but it must 

 be borne in mind that the latter difference is no greater than between 

 species united in the same genus under Cahrita and OjJiiops. 



Synopsis of the Sjjecies. 



I. Frontonasal single ; suljocular usually bordering the mouth. ; 

 occipital usually present ; 34 to 40 scales and plates round 

 middle of body ; S to 13 (rarely 15) femoral pores on each 

 side. 



A. A single anterior loreal. 

 Upper head-shields rather feebly striated ; prefrontal in contact 

 with the anterior of the two large supraoculars, which are in 

 contact with superciliaries ; hind limb reaching a little beyond 

 the shoulder in males . I. tanganicana, Blgr., p. ]hl. 



Upper head-shields strongly striated and keeled; prefrontal 

 usually in contact with the anterior of the two large supra- 

 oculars, which are separated from the superciliaries by small 

 scales ; hind limb reaching axil or shoulder in males. 



I. bivittata. Socage, p. 182. 

 Upper head-shields strongly striated ; prefrontal not reaching 

 the anterior of the two large supraoculars, which is as long 

 as or a little shorter than its distance from the second 

 loreal; a series of small scales between supraoculars and 

 superciliaries ; hind limb reachmg between shoulder and ear 

 in males . . . . /. capensis, A. Smith, p. l!So. 



Upper head-shields strongly striated ; prefrontal not reaching 

 the anterior of the two large snpraoculai-s, which is longer 

 than its distance from the second loreal ; a series of small 

 scales between supraoculars and superciliaries; hind limb 

 reaching ear or between ear and eye in males I. long'n'cs, Blgr., p. 188. 



