1. CHIROTES. 431 
As many as sixty-five species are characterized in this account ; 
thirty-nine are American, out of which only two (Chirotes and 
Rhineura) oceur north of the Tropic of Cancer, and four (Amphis- 
beenw) in the West Indies. The twenty-six other species inhabit 
Africa, with the exception of the four species of the genera Blanus 
and Trogonophis, which belong to the Mediterranean district. 
Synopsis of the Genera. 
A. Prospuyopontrs. 
I. Fore limbs present ....... .e.++ I, Chirotes, 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. Amphisbena, p. 435. 
Head strongly compressed, the rostral 
shield enormous, with an arched 
cutting-edge ...... eee eee eee 4, Anops, p. 451, — 
B. Segments of the pectoral region more or less enlarged, or 
forming angular series. 
Snout compressed ............006. 5. Geocalamus, p. 453.— 
Snout depressed; nostril in a small 
separate nasal; tail cylindrical.... 6. Monopeltis, p. 453. —- 
Tail depressed, above with rows of 
round tubercles .........eeeeeee 7. Rhineura, p. 459, —~ 
Nostril pierced in the rostral ...... 8. Lepidosternon, p. 460.— 
B. EmpHyopontes. 
No prewanal pores ...........00005 9. Trogonophis, p. 470. ~ 
Preeanal pores; three large upper head- 
shields besides the rostral ........ 10. Pachycalamus, p. 471. 
Preanal 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; Merrem, Tent. Syst. Amph. p. 161; 
Fitzing. Neue Classif. Rept. p. 24; Wagl. Syst. Amph. p. 196; 
Wiegm. t.c.; Dum. § Bibr. v. p.472; Gray, Cat. Tort. 1844, p. 74, 
and Cat. Sh, Rept. ii. p. 384: Bocourt, Miss. Sc. Mex., Rept. p. 486, 
Bimanus, Oppel, Ordn. Rept. p. 45. 
