MEXICAN HERPETOLOGICAL MISCELLANY—SMITH 359 
patches; groin nearly black; ventral surfaces of limbs and tail light. 
Variation.—In 44 specimens the dorsals vary from 387 to 44, average 
40.3 ; in 64 counts the femoral pores vary from 14 to 18, average 16. In 
all the dorsal scales on the lower foreleg are constantly about half the 
size of those on the upper foreleg. 
Adult females are so remarkably like the males in ventral as well 
as dorsal coloration that they can be distinguished only with difficulty 
by thismeans. The largest measures 77 mm. snout to vent; the largest 
male measures 87 mm. 
Comparisons —This is one of the most distinct of the races of 
jarrovii, having peculiarities both in pattern and scutellation. The 
transverse black streaks on the sides of the belly do not occur in any 
other form of jarrovii; in fact the only other species having similar 
marks is dugesiz, a species very different from jarrovii in the conforma- 
tion of the scales (mucrones arising within the edges of the scales on 
sides of body and neck). In no other subspecies of jarrovi do the 
females have the same ventral coloration as the males; such a phe- 
nomenon is of rare occurrence in Sceloporus, and has been observed in 
no other species of the poinsettii or related groups. 
The most obvious peculiarity in scutellation is the relatively small 
size of the dorsal scales on the lower foreleg, compared with those on 
the upper foreleg (nearly twice as large). This character will sepa- 
rate it from all other subspecies of jarrovii. It agrees with immu- 
cronatus in having the lateral scales distinctly decreasing in size, and 
distinctly smaller than the dorsals. In the other subspecies the lateral 
scales, at a point about halfway between axilla and groin, are sub- 
equal to or larger than the dorsals; they do not distinctly increase in 
size medial to this point. 
Habits—These specimens were found sunning themselves on the 
rocks scattered on the eastern edge of Lake No. 4, at the Lakes of Zem- 
poala, in the State of Mexico (reached via Tres Cumbres, Morelos). 
The elevation is about 10,000 feet above sea level. The lizards are ex- 
tremely wary, so that it was necessary to stalk them from behind 
boulders in order to get within gunshot of them. Although the rocks 
and cliffs around several other lakes on the park were examined, 
sugillatus was not found, although f. ferrariperezi was very abundant. 
The latter was excluded in the spots where the former was found. 
KEY TO THE SUBSPECIES OF SCELOPORUS JARROVII 
1. Lateral body scales distinctly decreasing in size laterally, at a point halfway 
between axilla and groin, distinctly smaller than dorsal scales_________ 2 
Lateral body scales not decreasing in size laterally at least up to a point 
halfway between axilla and groin, where they are still subequal to, or even 
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2. Dorsal scales on lower foreleg about half size of those on upper foreleg; dark 
transverse streaks in lateral belly patches; nuchal collar covering six scales 
