60 Trans. Acad. Sci. of St. Louis 
ground color varies from blackish to light gray or oliv- 
aceous; ventral parts light to slate, often yellowish; 
lower labials and under parts of upper labials white or 
nearly so. 
Data upon 150 Kansas specimens of E. obsoletus may 
be presented as follows: Length of body, 30-121 (91- 
100) ; length of tail, 36-168 (121-135) ; total length, 66-283 
(226-250) ; width of head, 5-20 (14-16); length of tail as 
percentage of total length, 44.1-62.4 (56-58); width of 
head as percentage of body length, 11.8-19.5 (14-16). 
Ellis and Henderson (1913) gave the total length of 
this species as 305 mm. This figure exceeds that of the 
writer, and equals the maximum figure given by Ditmars 
(1915). Other measurements are not given by these 
authors. 
Habitat and Habits.—A survey of the literature shows 
that very little has been written on the habitat and habits 
of this form. Grant (1927) has discussed the behavior of 
a ‘‘blue-tailed’’ captive at some length. As indicated by 
studies in Kansas the Sonoran skink is able to live in a 
number of situations. It has been found in company 
with Leiolopisma laterale and E. fasciatus on thickly 
wooded hillsides in Douglas County, and with Crotaphy- 
tus collaris in Riley and Cowley counties situated in the 
vicinity of rocky prairie ledges above the wooded hill- 
sides. In the spring of 1925, near the town of Haddam, 
Washington County, several specimens were taken from 
isolated outcroppings of sandstone where no trees were 
present. Specimens have not been taken in exclusively 
sandy areas, nor in the grassy Kansas prairie where 
there are no sheltering rocks. Six specimens were taken 
from limestone ledges near Haverhill, Butler County, in 
July. They were not found on the tops of the hills, but 
in the dips of valleys, where, no doubt, the soil humidity 
