66 ME. G. A. BOULENGER OX LIZARDS 



with a verj' distinct apical sensory pit ; tlie whorls nearly equal in length ; 42 to 50 

 scales in the fourth or fifth whorl behind the postanal granules. 



Young (PI. IV. fig. 7) olive-grey above, with numerous black and whitish spots, 

 which have a tendency to run together to form wavy transverse bars ; a black spot 

 on each upper labial shield ; temple white with three black vertical bars ; lower 

 parts yellowish white. These markings disappear with age, the adult (PL IV. fig. 6) 

 being uniform pale greyish or brownish olive, with more or less distinct traces of the 

 spots on the body and of the markings on the sides of the head. 



Measurements (in millimetres) : — 



6. ?. 



From end of snout to vent . . 152 155 



„ J, „ fore limb . 65 65 



Head 38 37 



Width oC head 27 22 



Depth of head 23 20 



Fore limb 56 55 



HindHmb 90 85 



Foot 42 3y 



Tail 320 — 



Particulars of Specimens examined. 



*1. 2. 3. 4. 5. 6. 7. 



S 152 87 27 15 47 28-27 30 



„ 150 85 27 14 48 20 30 



„ 124 85 28 ? 45 2Q 29 



,, 81 95 27 13 50 28-27 29 



$ .155 93 29 15 48 27-26 30 



„ 152 86 29 16 48 25 29 



* For explanation of numbers, see p. 48. 



Habitat. Lacertajayakari, named after its discoverer, the late Surgeon-Major A. S. 

 G. Jayakar, is known only from Muscat, Arabia. 



This is the giant of the Section Podarcis. In conformity with the frequent if not 

 absolutely general rule in this genus that in allied forms an increase in size is 

 accompanied by a finer scaling [L. agiUs-viridis-ocellata, L. muralis ti/jnca-nif/ri- 

 ventris-hedriaqce) the size of the scales is so much reduced as to render the definition 

 of this species by a numerical formula extremely easy. It is true that the same high 

 number of scales across the body and of plates in the collar is reached in L. muralis, 

 var. lilfordi, but the number of gular scales remains lower (40 the maximum), the 

 temporal scales are larger, there are fewer longitudinal rows of ventral plates and 

 anterior labials, and the postnasal is single. 



I regard L. la?vis as the nearest ally of L. jayakari. The greater difference in the 

 general proportions between the two sexes, the shorter head, the coarser lepidosis, 



