50. PHRYNOSOMA. 243 



Var. dugesii. 



Tiipaya diigesii, Bocunrt, Miss. Sc. Mex., Rept. pi. xi. fig. 3. 

 orbicularis, var. B, Bucourt, I. 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. Phrjoiosoma boncardii. 



Tapaya boucardii, Bocourt, Miss. Sc. Mex., Rept. p. 225, pi. xi. 

 fig' 4. 



Closely allied to P. orbicidare. 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 coronatnm. 



Phrynosoma blainvillii, part., Gray, Cat. p. 228. 

 Agama (Phrynosoma) coronata, Blainv. Nouv. Ann. Mus. iv. 1835, 



p. 284, pi. xxv. fig. 1. 

 Phrynosoma coronatum, Diini. ^- Bibr. iv. p. .318 ; Holhr. N. Am. 



Herp. ii. p. 97, pi. xiii. ; Girard, in Sfansh. Exped. Gr. Salt Lake, 



p. .360, pi. viii. figs. 7-12 : Hallow, in Sitgr. Exped. Zuni ^- Color. 



Riv. p. 122. 



blainvillii. Gray, Zool. BeecJiey^s Voy. p. 96, pi. xxix. fig. 1. 



(Batrachosoma) coronatum, Fitzing. Syst. Rept. p. 79. 



Batrachosoma coronatum, Girard, U.S. Explor. Exped., Herp. 



p. 400, pi. XX. figs. 10-13 ; Bocourt, Miss. Sc. Mex., Rept. p. 239, 



pi. 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 postorbital, one occipital, three temporals ; a more or less 

 distinct additional small spine between the occipitals ; latter aa 

 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 scries of spines on each side of the 

 neck. Eack with large, keeled, flat, triangular or tribcdral scales, 

 which arc mostly as broad as long ; two lateral series of spines, 

 up]ier much stronger than lower ; pectoral and ventral scales j^er- 

 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 lar"-e 



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