FAMILY AGAMID^E. 31 



FAMILY AG AMID 2£. 



Body depressed, corpulent. Tail and abdomen with small imbricated scales. Head large, 

 inflated, often armed with spines. Throat frequently with a fold, and susceptible of infla- 

 tion. Tongue short, thick. No palatine teeth. Toes simple, not enlarged, free. 



This family embraces many singular and varied forms. Under the following genus are 

 included those animals found in the southern and western part of the United States, and known 

 under the popular names of Horned frogs, Horned toads, <§-c. 



(EXTRA-LIMITAL.) 



Genus Phrynosoma, Weigmann. Body nearly orbicular. Head short, rounded in front; bordered 

 laterally and anteriorly with strong spines, and covered above with polygonal subequal scales. 

 Occipital plate semicircular. 

 P. cornutum. (Holbrook, Vol. 3, pi. 9.) Head with a range of long spines on each side of the 



lower jaw. Nostrils within the internal margin of the superciliary ridge. Abdomen with carinate 



scales. Missouri. 

 P. orbiculare. (Id. Vol. 3, pi. 10.) Lower jaw without spines. Nostrils at the anterior extremity 



of the superciliary ridge. Abdomen with smooth scales. Louisiana, Arkansas. 

 P. coronatum. (Id. pi. 11.) A series of eleven spines behind the head. Nostrils as in the preceding. 



Eight series of large rhomboidal elongated and pointed scales under the chin, reaching to the throat. 



A row of spines on each side of the tail to the tip. Oregon. 

 P. douglasii. (Id. pi. 12.) Nostrils as in the preceding. Head with tubercles, and not spines, on the 



posterior part. Body above with slightly elevated tubercles, smooth; scales beneath. Eighteen 



femoral pores on each side. Oregon. 



GENUS TROPIDOLEPIS. Cuvier. 



Body oblong, depressed, and covered with imbricated and carinated scales. Head short, 

 depressed, rounded in front ; occipital plate large. Thighs with a series of distinct pores. 

 Neck contracted, smooth beneath. No dorsal nor caudal crest. 



THE BROWN SWIFT. 



Tropidolepis undulatus. 

 plate viii. fig. 16. — (state collection.) 



Lacerta undulata. Daudin, Hist. Nat. des Reptiles, Vol. 3, p. 384. 



L. hyacinlhina et fasciata. Green, Acad. Nat. Sciences, Vol.1, p. 349. (Male and female.) 



Uromastyx. Merrem, p. 57. 



Agama undulata. Harlan, Med. and Phys. Res. p. 140. • 



Tropidolepis undulatus. Cuvier, apud Griffith, Vol. 9, p. 126. 



Sceloporus undulatus. Gravenhorst, Nova Acta, Vol. 18, p. 768. 



Tropidolepis undulatus. Holbrook, N. Am. Herpetology, Vol. 3, p. 51, pi. 8 ; and Vol. 2, p. 73, pi. 9 of Ed. 2da. 



Characteristics. Brownish, with deeper brownish irregular transverse undulating bands. Be- 

 neath green, with a large white cross. Length 5-8 inches. 



