146 Bulletin of Laboratories of Denison University [Voi. xi. 
C. sexlineatus only doubtfully have been found among the 
numerous individuals of the next and nothing can be said of its 
range or habits. It is true that it seems to vary in the direction 
of C. undulatus but the forms seen are easily distinguished 
from that species. 
Cnemidophorus Undulatus, Hallowell. 
Plate XXIV, Fig. 22. 
This is perhaps the commonest lizard in the Rio Grande 
valley and is everywhere in evidence. It differs from the pre- 
ceding species in the absence of the patch of enlarged scales on 
the under aspect of the fore arm and in the colors. The back 
is marked by from seven to nine wavy dark bands which, in the 
older individuals, break up into irregular blotches to the almost 
entire suppression of the longitudinal arrangement ; the sides 
of the head are distinctly marked with dark spots but the spots 
on the throat are small and scattering ; head and tail olive. We 
have not seen typical specimens of C. tigris but they no doubt 
occur and will be recognized by the almost entire absence of 
the black markings on the sides of the head and a suffusion of 
gray on the throat. The color of the back is more minutely 
broken up. 
Family. Scincidae. 
Tongue slightly notched at the tip ; head covered with 
large regular plate scales on body and tail of moderate size, im- 
bricate, supported by bony plates ; eyelids present ; pupils 
round ; dendition pleurodont ; no femoral pores. 
Genus. Eumeces. 
All the scales are thin, smooth and imbricate. There is a 
distinct ear opening and the gular and lateral folds are absent, 
limbs pentadactyl ; nostril penetrating the nasal plate ; digits 
not denticulated laterally. The skinks are of world-wide distri- 
bution and three species at least have been reported from New 
Mexico but as we have but once encountered a representative 
and have no authentic material it seems best to reserve the men- 
tion of these till material shall have been collected. It is to be 
