DAD, CALIFORNIA ACADEMY OF SCIENCES  [Proc. 4Tu SER. 
The E. elegans group is to be regarded as made up of three 
subgroups, as follows :— 
1. The Eumeces elegans subgroup, characterized by the 
presence of a patch of much enlarged scales on the back of the 
thigh and the absence of a postnasal plate, and including only 
E. elegans. 
2. The Eumeces latiscutatus subgroup, characterized by 
the absence of a patch of enlarged scales on the back of the 
thigh and the presence of a postnasal plate, and comprising 
E. latiscutatus, E. latiscutatus okadae, and E. barbourt. 
3. The Eumeces marginatus subgroup, characterized by 
the absence of a patch of much enlarged scales on the back of 
the thigh and the absence of a postnasal plate, and made up of 
Eumeces marginatus, E. marginatus kikaigensis, E. margina- 
tus amamiensis, and E. ishigakiensis. 
The chief differences between these various forms are 
indicated in the following 
KEY TO THE SPECIES AND SUBSPECIES. 
a.—Only one azygous postmental; a strongly keeled scale behind corner 
of anus. i ‘ 
b.—A patch of much enlarged scales on back of thigh. No postnasal. 
(China, Formosa, Pescadores). 
Eumeces elegans. 
b’°—No patch of much enlarged scales on back of thigh (sometimes 
slightly enlarged in E. marginatus subgroup). 
c.—No postnasal. (Loo Choo Islands). 
d—Young with two lateral lines separated by about the width 
of two scales; lower lateral line separated from fore- 
limb by not more than distance between lateral lines. 
e.—Scales of two middle dorsal rows broader than those 
of next rows; upper lateral line confined to scales 
of third row from middorsal line; superciliaries not 
more than eight. (Okinawa). 
E. marginatus. 
e?—Scales of two middle dorsal rows normally not 
broader than those of next rows; upper lateral line 
on scales of third and fourth rows from middorsal 
line; superciliaries not less than eight. 
f—Normally with twenty-six tows of scales around 
middle of body. (Amami O shima). 
E. marginatus amamiensis. 
f’.—Usually with twenty-eight rows of scales around 
middle of body. (Kikaiga shima). 
E. marginatus kikaigensis. 
