924 "Traiisactions.— Zoologij. 
* 
chin downwards. In the female the colouring generally is darker and the 
spots are indistinct. 
In the adult state the female is always larger than the male. The fol- 
lowing are the measurements of the two finest specimens in my possession. 
Male. Female. 
Totallength, measuring along the back... 16-0 in. 17:5 in. 
From the chin to the vent a ND prr Ce 9775, 
From the vent to end of tail  ... uen US 7715... 
Note.—It should be mentioned that in the female described above the 
tail has at some period been broken, and has reproduced itself, giving a 
somewhat stumpy extremity, and a somewhat shorter measurement than it 
would otherwise yield. 
2. SPHENODON GUNTHERI, sp. nov. 
Adult female: Entire upper surface greenish or olive-yellow, with 
humerous obscure, rounded spots of pale yellow or white, becoming darker 
on the tail ; the nose, eyelids, sides of the head and outer margins of legs 
and toes bright yellow; spines for the most part pure white; irides dark 
brown with black pupil. On the nape, covering a part of the nuchal fold 
and roots of spines, there is a large spot of jet black, and on each side of 
the neck, in front of the shoulder a broad crescent-shaped mark of the 
same ; under parts greyish-white, changing to pearl grey on the throat, 
with interrupted longitudinal series of perfectly white scales. 
The female is considerably larger than the male, two of my specimens 
giving the following measurements :— 
Male. Female. 
Total length, measuring along the back 17:5 in. 19-25 in. 
From the chin to the vent... vie ME as 9:25 ,, 
From the vent to end of tail ... uc E ae 9:95 ,, 
The male, besides being smaller, is much darker in colouring than the 
female, the upper surface being shaded with brown. In this respect this 
species appears to differ from S. punctatum, in which the male has lighter 
and brighter colours than his mate. 
Having had an opportunity of examining a number of specimens in 
various stages of growth, I am enabled to add some further notes descriptive 
of the young :— 
1. Very young state—Extreme length, 4 inches. General colour, earthy- 
brown ; fore-part and sides of the head, insertion of the limbs and along 
the ridge of the tail, paler brown; transverse markings of darker brown 
on the cheeks, chest, and limbs; irides, mottled grey, having a linear, 
black pupil margined with white. It is noticeable that in this condition 
the colour of the lizard is so exactly assimilated to the ground which it 
