1. cniROTEs. 431 



As many as sixty-five species are characterized in this account ; 

 thirty-nine are American, out of which only two (Chirotcs and 

 Rhineura) occur north of the Tropic of Cancer, and four {Amphis- 

 bcena) in the West Indies. The twenty-six other species inhabit 

 Africa, with the exception of the four species of the genera Blanus 

 and Trogonoj^Jds, which belong to the Mediterranean district. 



Synojisis of the Genera. 

 A. Prosphyodontes. 



I. Fore limbs present 1. CMrotes, p. 432. 



II. No limbs. 



A. Segments of the pectoral region not differentiated. 



Nostril pierced in the first labial .... 2. Blanus, p. 433. 



Nostril in a separate nasal ; head with- 

 out cutting-edge 3. Amphisbsena, p. 435. 



Head strongly compressed, the rostral 

 shield enormous, with an arched 

 cutting-edge 4. Anops, p. 451. 



B. Segments of the pectoral region more or less enlarged, or 

 forming angular series. 



Snout compressed 5. Geocalamiis, p. 453. 



Snout depressed ; nostril in a small 



separate nasal ; tail cylindrical .... G. Moiiopeltis, p. 453. 

 Tail depressed, above with rows of 



round tubercles 7. Rhineura, p. 459. 



Nostril pierced in the rostral 8. Lepidosternon, p. 4G0. 



B. Emphtodontes. 



No praeanal pores 9. Trogonophis, p. 470. 



Prieanal pores ; three large upper head- 

 shields besides the rostral 10. Pacliycalamus, p. 471. 



Prseanal pores ; a single upper head- 

 shield besides the rostral 11. Agamodon, p. 471. 



A. PROSPHYODONTES. 

 Prosphyodontes, Wiegm, Herp. Mex. p. 20. 



1. CHIROTES. 



Chirotes, Cuv. R. A. ii. p. 57 ; Mcrrem, Tent. Si/st. Awph. p. 101 ; 

 Fitziny. Neue Classif. Rept. p. 24 ; Wa(/l. Syst. Aniph. p. 190; 

 Wierpn. I. c. ; Bum. ^- Bilr. v. p. 472; Graij, Cat. Tort. 1844, p. 74, 

 and Cat. Sh. Rcjd. ii. p. 34 : JJocuurt, Miss. Sc. Me.v., Rept. p. 48G. 



Bimanus, Oiypel, Ordn. Rept. p. 45. 



