EAST AFRICAN LIZARDS. 



151 



rows, twenty-six specimens have 22 scale-rows, and ten have 20 

 scale-rows. 



This character of Jiavigularis seems, therefore, a good one by 

 which to differentiate East African forms. In twenty-nine 

 specimens examined by Nieden he found only three specimens 

 with more than 24 dorsal scale-rows. 



If we apply the relative position of the head-scales to the 

 present series thus, 



Praefrontals in contact forming- a long suture nigrolineatus, 



Prsefrontals separated, fronto-nasal touching frontal flavigularis, 



we find no less than twenty-nine of the specimens would be 

 referable to nigrolineatus, only hve to Jiavigularis, whilst five are 

 intermediate in that the praefrontals are only barely in contact. 

 As has just been pointed out in the case of Gerrhosaurus major, 

 the relative position of these head-scales as a specific character is 

 of but little use in this genus. 



If the character of the number of femoral pores be applied, 



Femoral pores 14 or more nigrolineatus, 



Femoral pores 13 or less Jlavigidar^is, 



we shall again find that the large majority of the lizards are 

 referable to nigrolineatus. Not having had the opportunity of 

 going into the matter more thoroughly or examining Central and 

 West African series of these lizards, I do not like to express an 

 opinion, but where both nigrolineatus and flavigularis are found 

 overlapping in so many localities it seems a, pity not to unite 

 them as a single species. 



The largest male taken measured 18^ inches (156"31 1 mm.)^ 

 the largest female 17| inches (137"305 mm.). 



The coloration of the young specimens w^as generally more 

 vivid than in the adults. The following colour notes were made 

 on capturing a 3'oung speciman at Lumbo:-- "Centre of back 

 occupied by broad chocolate-brown band, bordered on either side 

 by a black line one scale in width, on the outer side of which 

 again is a sea-green or yellowish line. Both lines disappear 

 about half-way along tail. Sides vertically streaked with black 

 and sea-green, usually two of the former to one of the latter. 

 Belly white with crea.ni}- tinge. Fore-legs brown, mottled black 

 and sea-green, hind-limbs spotted with pale yellow. Tail biown, 

 with indistinct markings except on the basal portion whei-e the 

 markings of the "back persist." Adult males show a great deal of 

 red or pink laterally on body and tail ; this disappears usually in 

 preserved specimens. 



At Morogoro (4. i. 17) a female was taken with four white 

 eggs in ovary ; these measured J inch long. A young male 

 8| inches in length was taken at tlie same place (19. 1. 17). Of 

 this specimen a note was made : — " No gaudy markings ; the 

 yellow^ lines are pale almost to whiteness and the black marks are 

 unnoticeable except by close examination/' 



