ill : 



COMPENDIL'M OF GENERIC DISTINCTIONS. 



sleiftler, not fringed. Back not crested. Throat compressed 

 and toothed in trout. Eyes prominent. Brazil. 



Genus. Iul'ana. — Pores on thigh. Throat-pouch large and 

 compressed; toothed in front. Scales of back moderate. Tail 

 compressed. Tropical America. 



Genus. Alopo.notus. — Scales of back very minute. Throat- 

 pouch not toothed. Rest like Iguana. St. Domingo. 



Genius. Metopoceros. — Throat-pouch small, with a cross 

 fold. Mi. Idle toes of bind feet toothed. Head-shields flat, a 

 large horu-like tubercle on forehead, and two pair of large plates 

 between nostrils. Pores on thigh in two rows, St. Domingo. 



Genus. Oreucephat.bs.— Head-shields conical and deeply 

 wrinkled. Outer toes of bind feet very long. Rest like preced- 

 ing genus. < oilapagos. 



Genus. Basxliscus. — Head long, with crest behind; a pin-like 

 cicst along the bark and tail. No pores on thigh. Throat with 

 cross fold. < tutor toes of hind feet webbed at base, not fringed 

 at sides. Tropical America. 



Genus. XiPHosrurs. — Throat-pouch large and dilatable. No 

 pores on thigh. Toes dilated under last joint but one. Tail 

 with bony crest. Central America. 



Genus. Anolius. — Back simple, or with little double crest of 

 small scales. Rostral shield erect, nose rounded. Rest like 

 Xiphosurus. North America. 



Genus. Phrynosoma.— Body flattened and covered with small 

 scales. Sidos toothed. Head armed with spines. Tubercular 

 scales scattered over back and tail. California. 



Family. AGAMIDJE.— Tooth on edge of jaws; tongue short, 

 sometimes without a niche at the tip. Limbs strong, thumb of 

 hind foot on same line as the toes. 



Genus. Draco. — Body compressed, scales overlapping; ribs 

 greatly elongated, supporting expansion of skin. Three pouches 



on throat. Ears not scaled; nostrils below face-ridge. Java. 



i n 



Genus. GoNYOOEPHALUS. — Ribs simple, back with crest, 

 five toes on each foot. Tail with long-keeled scales beneath; 

 cars exposed. Java. 



Genus. Cklamtdosaurus.— Pores on thigh. Scales irregular 

 and overlapping. Toes fringed; throat with a fold; back 

 crested. Nook with a large frill-like expansion on each side. 

 Australia. 



Genus. Grammatophora. — Back without .-rest, eovered with 

 cross rows of largo scales. Pores of thigh numerous. Nook 

 without frill. Australia. 



Gams. Stei.lio. — Body flattened, throat with a cross fold, 

 back covered with overlapping scales. Several rows of ventral 

 poros. Ears exposed. Tail covered with largo spine-like scales 

 in regular rings. Northern Africa and Asia. 



Gums. Aoama. — Single row of ventral pores. Scales keeled. 

 Back not crested or toothed. Northern Africa. 



Genus. Meoalochilus. — No ventral pores. Ears hidden. 

 Toes fringed on side. Edge of month fringed. Russia. 



Genus. Uromastyx. — No ventral pores, but some on the 

 thighs. Ears exposed. Tail bn.ad and Hat, covered with reg- 

 ular rings of spiny scales. Northern Africa and Russia. 



Genus. Moloch. — No pores. Ears exposed. Neck with a 

 large convex tubercle on its upper surface. Body and limbs 

 covered with large spiny tubercles. Australia. 



Tribe. VENDROSAURA. Body compressed. Scales gran- 

 ular and arranged in circular bands. Eyes projecting, globular, 

 covered with circular lid pierced with a very small round hole. 

 Tongue nearly cylindrical, long, extensile, and rather large at 

 tie 1 tip. Ears hidden under skin. Toes five on each foot, ar- 



ranged in two opposing groups. Tail long and prehensile. <>nly 

 one genus. 



Genus. CHAMELEO. — Characters of tribe. Old world. 



Order. OPHIDIA. -Body elongated, true feet none. Mouth 

 dilatable, bases of jaws inseparable. Eyelids and external ears 

 wanting. Tongue long, flat, deeply forked, and sheathed in 

 lower jaw. Vertebrae fitting into each other with ball and 

 socket joint, the socket being in front. 



Sub-order. YIPERIN^E. — Jaws weak, upper toothless, but 

 having largo fangs in front; lower jaw tcjothed. Shields of 

 belly broad and band-like. Top of head flat, eyes at side, nos- 

 trils at sides of muzzle. 



Family. CEOTALIDJE.— Face with a large pit on each side, 

 between eye and nostril. 



Genus. CraspedoOSPHALPS. — Head scaly, a single shield over 

 eyebrow; shields of hinder part of lips large; scales lancet-shaped 

 and keeled. Tail ending in a spine. Plates under tail in two 

 rows. America and islands. 



Genus. Lachesis. — Plates under tail in four rows. America. 



Genus. Cenchkis. — Head shielded. Plates under tail in one 

 row. Tail ending in a spine. America. 



Genus. Crotalophokus.— Head shielded. Plates under tail 

 in one row. Tail ending in a rattle. Nine large shields behind 

 eyes. America. 



Genus. UropsophOS. — Head with scales behind; shields of 

 temples and lips rather large. Tail ending in rattle. America. 



Genus. CROTALUS. — Head with scales behind; shields of tem- 

 ples and lips very small and rather convex. America. 



Family. VIPERIDiE.— Head without any pit between the 

 eyes and nostrils. 



Genus. Daboia. — Head Hat and long, with sharply-keeled 

 scales. Nostrils large Pupils of eyes round. India. 



Genus. Clotho.— Pupil of eye- erect and oblong. Head short 

 and broad, the keeled scales ending in a spine. Rest like Da- 

 boia. Africa. 



Genus. Cerastes. — Nostrils small and semilunar. Keel of 

 scales not reaching to tip. Two rows of [dates under tail. Eye- 

 lid of male horned. Northern Africa. 



Genus. Ei'ius. — Nostrils very small, between twee little scales. 

 Eyelids of male not horned. One row of plates under tail. 

 Africa ami India. 



Genus. Yipek\. — Head with shields, flat, ami high on sides; 

 nostrils in middle of a shield. Nose rather curved upwards. 

 Europe. 



Genus. Pumas. — Nose blunt; front of head with small shields. 

 Europe. 



Genus. AcANTBOPHIS. — Head flat and projecting over eyes; 

 nostrils between two shields. Tail ending in a hooked spine. 

 Australia. 



Sub-order. COLUBRIN^.— Both jaws strong and toothed, 



with fangs in front or grooved teeth behind. 



Family. HYDRIDE. -Ventral shielel narrow. Eyes and nos- 

 trils above, nostrils with valve. Fangs moderate, and mixed 

 w ith teeth of jaw. Pupil small and round. 



Section T. — Abdomen keeled, and furnished with long, lancet- 

 shaped shields or scales like tlieeso of back. Tail mostly e .im- 

 pressed. 



lie,, us. Pelamis. -Head shielded, flat ami long, gape wide; 

 nasal shield very large. Scales square or six-sided. Tail com- 

 pressed. Pacific. 



