EAST AFRICAN LIZARDS. 151 



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

 scale-rows. 



This character of Jlavigularis 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, 



Prsef rentals in contact fovniing a long suture nigrolineatus, 



Prefrontals separated, fronto-nasal touching frontal jlavigularis, 



we find no less than twentj^-nine of the specimens Avould be 

 i-eferable to nigrolineatus, only five to flavigularis, whilst five are 

 intermediate in that the prfefrontals 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 nigrnlineatus, 



Femoral pores 13 or less Jlavigularis, 



we shall a,gain find that the large majority of the lizards are 

 referable to nigrolineatus. Kot 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 jlavigularis are found 

 overlapping in so many localities it seems a pity not to ui:iite 

 them as a single species. 



The largest male taken measured 18| inches (156"311 mm.), 

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



The coloration of the young specimens was generally more 

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

 on capturing a young 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 creamy tinge. Fore-legs brown, mottled black 

 and sea-green, hind-limbs spotted witli pale yellow. Tail broAvn, 

 with indistinct mai-kings 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 g inch long. A young male 

 8;|- inches in length was taken at tlie sa,me 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 

 vinnoticeable except by close examination." 



