50. PHRYNOSOMA. 243 
Var. dugesii. 
Tapaya dugesii, Bocourt, Miss. Sc. Mex., Rept. pl. xi. fig. 3. 
orbicularis, var. B, Bocourt, 1. c. p. 224. 
Spines subequal, the occipitals not extending posteriorly quite as 
far as the longest temporals. Head nearly as broad as long. 
Colima. 
3. Phrynosoma boucardii. 
Tapaya boucardii, Bocourt, Miss. Sc. Mex., Rept. p. 225, pl. xi. 
g. 4, 
Closely allied to P. orbiculare. The occipital spines, which are 
nearly of the same size, and do not extend posteriorly quite as far 
as the longest temporals, are directed upwards and outwards. Head 
much broader than long. Gular scales feebly keeled. 
Plateau of Mexico, 
4, Phrynosoma coronatum. 
Phrynosoma blainvillii, part., Gray, Cat. p. 228. 
Agama (Phrynosoma) coronata, Blainv. Nouv. Ann. Mus. iv. 1835, 
p. 284, pl. xxv. fig. 1. 
Phrynosoma coronatum, Dum. § Bibr. iv. p. 818; Holbr. N. Am. 
Herp. ii. p. 97, pl. xiii; Girard, in Stansb, Evped. Gr, Salt Lake, 
p- 360, pl. viii. figs. 7-12: Hallow. in Sttgr. Exped. Zuni § Color. 
Riv. p. 122. 
blainvillii, Gray, Zool. Beechey’s Voy. p. 96, pl. xxix. fig. 1. 
(Batrachosoma) coronatum, Fvtzing. Syst. Rept. p. 79. 
Batrachosoma coronatum, Girard, U.S. Explor. Exped., Herp. 
p- 400, pl. xx. figs. 10-18; Bocourt, Miss. Sc. Mex., Rept. p. 239, 
pl. xii. fig. 10. 
Head broader than long; nostril pierced in the line of the canthus 
rostralis ; tympanum naked; the head-spines large; on each side 
one posterbital, one occipital, three temporals; a more or less 
distinct additional small spine between the occipitals; latter as 
large as or a little larger than the largest temporals, directed 
obliquely upwards and extending posteriorly as far as or beyond 
the largest temporals. A series of very large projecting scales 
below the lower labials: three or four longitudinal series of enlarged, 
pointed, smooth or very feebly keeled scales on each side of the 
middle of the throat, the outer series the largest; gular folds 
several, irregular; two short series of spines on each side of the 
neck. Back with large, keeled, flat, triangular or trihedral scales, 
which are mostly as broad as long; two lateral series of spines, 
upper much stronger than lower ; pectoral and ventral scales per- 
fectly smooth. Thirteen to sixteen femoral pores on each side, the 
series not joining medially. Male with slightly enlarged postanal 
scales, Tail about twice as long as the head. Brownish above, with 
large dark brown or reddish spots arranged regularly ; a very large 
R2 
