■ | '
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sides o f th e neck, above an d b eh in d th e shoulder small, gra n u la r, an d some o f th em having a
m in u te pore. Scales o f th e back o f modera te size, larg e r th a n in Fitzingerii, rhomboid, having
a ra th e r p rom in en t carina, a n d term in a tin g in a d is tin c t p o in t. Scales o f th e u n d e r p arts
smooth an d rhomboidal. T h e posterior surface o f th e thighs is for th e most p a rt gra n u la r, but
a small p ortion n e a r th e gro in is covered w ith larg e r imbricated scales ; to a mu ch smaller
e x te n t, however, th a n in Fitzingerii, an d o th e r species which possess th is character.
T h e gene ral colour o f th e u p p e r p a r t o f this species is a rich d a rk brown, w ith whitish
transverse bands an d spots, hav in g a black m argin. I have figured in fig. 2, o f P la te V I., a
remarkable varie ty in which th e ban d s are alte rn a te black an d white, an d a bro a d er an d a
n a rrowe r longitudina l fascia o f a yellowish-white colour, ru n th e whole len g th o f th e body on
each side. T h e u n d e r p arts are yellowish-white, with d a rk o r almost black spots ; u n d e r th e
th ro a t bluish-gray with white spots.
DIMENSIONS.
Inches. Lines.
Length of the head.................................. 0 8
of the body ............................ 2 3
of the tail .................................. 3 4
Totallength 6 5
Length of anterior extremity ................ 1 1
of posterior extremity ........... 1 4
This species much resembles P r . Fitzingerii in many of its characters, as
well as in its size. I t m ay, however, be a t once distinguished from it by the character
of the scales of the back, which in this species are very distinctly carinated,
of a rather elongated form, and pointed at the extremity ; whereas in the other
they are shorter, smaller, the carina is very slight, almost indistinct, and the posterior
extremity is obtuse.
The tail in the larger figure of our plate is deformed, having been renewed.
The specimen figured a t (2,) in the same plate, is so remarkably distinct in the
colours and marking, as to lead me to suppose th a t it may possibly be a different
species.
P r o c t o t r e t u s D a r w in i i .
P late V II.—F m . I , 2.
Corpore subdepresso ; capite squamis numerosis, parvis, subelevatis, lævibus non imbricatis
; aurium margine anteriore integro ; temporibus colloque granulatis ; serie
unicâ squamarum supralabialium; facie posteriore femorum partim granulosâ,
partim sqtiamis imbricatis tectâ.
Habitat, Bahia Blanca, Northern Patagonia. Mr. Darwin.