The Lizards of Kansas 21 
least traces of two whitish or yellowish longitudinal 
stripes, which may be distinct enough in some specimens 
to intergrade with the condition usually found in S. wn- 
dulatus thayerii; sides, also, with wavy, dark brown 
eross bars, approaching each other or overlapping on 
the back, and leaving not more than a narrow mid-dorsal 
band of solid ground color; ventral parts green, slate, 
olivaceous, or white; sides of abdomen and throat often 
blue; a diffuse streaking of blackish flecks present on the 
ventral surface. 
The study of variation in the size and proportion of 
this species was made from 55 Kansas and Arkansas 
specimens. The data follow: Length of body, 34-67 (41- 
90); length of tail, 45-98 (51-60); total length, 80-162 
(91-105) ; width of head, 7-14 (8-9) ; length of tail as per- 
centage of total length, 49.5-61.4 (58-60); width of head 
as percentage of body length, 17.8-24.0 (18-20). 
It is to be noted that the head widths of the two Kan- 
sas subspecies of S. undulatus have the same mode, and 
that the range of variation in most other proportions is 
nearly the same. Housholder (unpublished) attributed 
a wider head to 9. wndulatus undulatus than to S. undu- 
latus thayerit. To test this distinction, twelve pairs of 
specimens, which measured the same in total length, 
were selected at random from the writer’s data tables 
for each subspecies. The summary of the comparative 
head widths follows. 
S. undulatus undulatus: Range, 8.0-10.5 mm. Average 
9.017 mm. 
S. undulatus thayeru: Range, 7.5-11.0 mm. Average 
9.083 mm. 
The difference in the head width of the two forms, as 
indicated by this comparison, is too small to be consid- 
ered significant. However, the following summary, 
