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University of California Publications in Zoology |Vou.9 
orbital (postorb.) elements. The posttemporal openings are 
small. The nasal openings (pl. 2, fig. 6) are anterior. 
All of the neural spines are small and about equal in size. 
The partially ossified postischial symphysial eartilage is bifid 
at its tip and very nearly reaches to the caudal vertebrae (fig. B). 
Each caudal vertebra is supplied with well-developed trans- 
verse processes. The first pair of processes are short and curve 
posteriorly. The second and third pair are longest. 
Comparison.—Yarrow and Henshaw (1878) record several 
specimens of this species from the Mohave Desert. Cope (1898), 
however, places specimens in the U. S. National Museum, bearing 
the same number and locality, under platyrhinos, and notes but 
three specimens of maccalli, all of which are from eastern San 
Diego County (Imperial County). Thus it appears that P. platy- 
rhinos was mistaken by some former authors for the rarer species, 
A. maccalli. The two lizards are very different, as can be seen 
by the following table of the more striking differences (pl. 6, pl. 
(Soll Ae wkeaeh By (le saved IDE IM))e 
CoMPARISON OF Phrynosoma platyrhinos AND Anota maccalli 
Phrynosoma platyrhinos Anota maccalli 
1. Horns grooved and short. Horns smooth and long. 
2. Two or three well-developed Five or six well-developed temporal 
temporal horns. horns. 
3. One row of peripheral spines. Three closely-set rows of peripheral 
spines. 
4. Tail rounded. Tail flat. 
5. Femoral pores 7-12 on each side. Femoral pores 17—20 on each side. 
6. No dark median dorsal line. Dark median dorsal line. 
7. Supratemporal openings present. Supratemporal openings absent. 
8. Third sternal ribs attached to Third sternal ribs attached to 
xiphoid rods. sternum. 
Hasits 
Whether this species has any characteristic habits is not 
known. The stomach of a specimen was found to contain red 
ants and quite a little sand, which had probably been picked up 
with the insects. The coloration is of a lhght shade, closely 
imitating the light coloration of the desert sand and alkali soil. 
