54 University of California Publications in Zoology [Vou.9 
Anota maccalli Hallowell 
Flat-tailed Horned Lizard 
Anota M’Callii Hallowell (1852), p. 182. 
Doliosaurus me’calli Girard (1858), pp. 408-409. 
Phrynosoma maccallii Cope (1866), p. 310. 
Phrynosoma m’calli Van Denburgh (1897), pp. 100-101. 
Diagnostic Characters—Head small; occipital horns long, 
smooth, and conical; interoccipital horn lacking; nostrils above 
the line joining the superciliary ridges with the end of the snout; 
interocc. h. 
supratemp. - 
pin. for.--= 
Fig. F. Skull of Anota maccalli (Uniy. Calif. Mus. Vert. Zool., no. 
1006). dent., dentary; fron., frontal; jug., jugal; interocc. h., interoecip- 
ital horn; maz. maxillary; nas., nasal; nas. op., nasal opening; occ. h., oc- 
cipital horn; orb., orbit; par., parietal; pin. for., pineal foramen; prefron., 
prefrontal; premax., premaxillary; postorb., postorbital; supraoce., supra- 
occipital; supratemp., supratemporal; supratemp. op., supratemporal open- 
ing; temp. h., temporal horn. X 2. 
temporal horns five or six on each side, the two posterior sharp 
and of about equal length; head plates irregular in size and 
shape; two enlarged plates just back of the pineal eye and one 
between the occipitals; sublabials large and acute, the middle 
ones the broadest and longest; no enlarged infrarictal spine; one 
row of slightly enlarged gulars on each side; the small peripheral 
spines in three closely set rows, the middle row being the largest ; 
