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PHRYNOSOMA CORONATA.— 5/am?;J&. 



Plate XI. 



Characters. Head short, triangular; nostrils open at the anterior extremity 

 of the superciliary ridge; occipital region surrounded with eleven spines; eight 

 rows of large rhomboidal, elongated and pointed scales under the chin, reaching 

 to the throat, external series largest. Body covered with rhomboidal scales, and 

 large trihedral tubercles; two rows of spines along the flanks, the superior larger; 

 a row of spines on each side the tail, from the root to the extremity. 



SrNONTMES. Phrynosoma coronata, Blain., Nouv. Ann. du Mus. d'Hist. Nat, torn. iv. p. 

 284, pi. XXV. fig. 1. a b c. 

 Agama orbicularis, Aud., Birds, &c., vol. iv. pi. ccclxviii. 



Description. The head is short, thick, triangular, and covered on the forehead 

 and vertex with small polygonal plates of unequal size, and with a few scales 

 and elevated tubercles on the occipital region. The snout is short and rounded, 

 with the rostral plate very small. The nostrils are near the snout, open at 

 the anterior extremity of the superciliary ridge, and are directed upwards and 

 a little outwards. The nasal plates are single on each side, circular, exceedingly 

 narrow, and surrounded by six polygonal scales. The superciliary ridge is 

 prominent, projecting over the eye, and covered with five or six quadrilateral 

 plates; posteriorly it is elongated, and terminates in a pointed tubercle. The eyes 

 are small and sunken, with the pupil black and the iris very dark grey. The 

 superior labial plates are eight in number, quadrilateral, very small, and not 

 extending to the angle of the mouth, where their place is supplied by small 

 granulations; there are twelve inferior labial plates, quadrilateral, and still smaller 

 Vol. III.— 9 



