whole u n d e r surface is o f a whitish colour, sometimes hav in g a slight tin t o f orange towards the
posterior parts, marbled with black.
Var. C. I n this variety th e gene ral colour is dark brown, and th e yellow or g re en lo n g itu dinal
lines which characterize th e former varieties are b u t slightly marked ; b u t tlie black spots
u n ite an d form irre g u lar transverse bands.
DIMENSIONS.
Inches. Lines.
Length of the head............................................0 6
of the body .............................. l s
of the tail .................................. 4 6
0
This specimen very much resembies in its more tangible characters, the P r.
tenuis: from which, however, it ditfers totally in the colouring, and in some measure
also in the general form, which is more thick and robust.
Found in Chile by M. Gay, from whence I also received specimens from Capt.
King, and other sources.—“ Valparaiso.” Mr. Darwin.
P r o c t o t r e t u s B i b r o n i i . N.S.
P late I I I .—F ig. 3.
Capite sqxiamis lævibus, subconvexis ; auribus ovalibus, margine anteriore unidentato ;
squamis temporum collique rotundatis lævibus imbricatis ; .colli minimis ; serie unicâ
squamarum supralabialium ; squamis dorsi rhomboideis, carinatis, posticé acumina-
tis ; abdominis squamis omnibus integris ; femorum facie posteriori omnino
granulosâ.
Habitat, Port Desire. Mr. Darwin.
D e sc r ip t io n .— G e n era l form resembling th a t o f P r . pictus an d cijanogaster. H e a d m odera tely
short, obtuse, covered w ith ra th e r large slightly convex scales; a single row o f scales between
th e labial an d th e orbitar. T h e an te rio r margin o f th e ea r has a single tooth. T h e temples
a n d th e sides o f th e neck are covered with imbricated scales, which have no c a rin a— those o f
th e neck, especially those on th e fold o f th e skin are smaller an d more ra ised th an th e others.
T h e scales o f th e back are ra th e r large, rhomboidal, with a d istin c t carina, term in atin g in a
p oint. Those o f th e abdomen an d sides are all o f th em en tire a t th e margin. T h e posterior
surface o f th e thighs is wholly granular.
T h e only specimen obtained b ein g a female, th e n um b er o f pre -an a l pores is n o t known.
T h e gene ral colour o f th is species is brownish grey ; a black lo ngitudina l line ru n s down
th e middle o f th e back an d tail. T h e re are two scries o f black spots on each side, and a