18 BULLETIN 18 7, UNITED STATES NATIONAL MUSEUM 



92. Maximum scale rows 15 93 



Maximum scale rows 17 or more 94 



93. Two preoculars ; dark above with a light neck ring. Diadophis (part) (p. 46) 

 One preocular; light above, no collar Sonera (part) (p. 126) 



94. Maximum dorsal scale rows 17 95 



Maximum dorsal scale rows 19 or more 97 



95. Striped or uniform brown above; belly immaculate except tips of ven- 



trals; no apical pits 96 



No stripes, dark (black) above, generally with a yellow collar; ventrals 

 spotted ; dorsal scales with single apical pits Diadophis (part) (p. 46) 



96. No stripes on body, whicli is reddish brown ; generally seven supra- 



labials Coniophanes * (p. 38) 



Stripes present on body ; supralabials seven or eight. 



Rhadinaea (part) (p. 115) 



97. Body striped or unicolor ; no scale pits 98 



Blotched; scale pits present 99 



98. Generally no loreal ; head scales curiously overlapping ; ventrals 165 or 



more; scale rows 19-15 Manolepis (p. 92) 



A loreal ; head scales normal ; ventrals less than 145 in forms with 19 

 scale rows ^ Coniophanes (part) (p. 38) 



99. Scale pits single; posterior maxillary teeth not grooved; subcaudals 



less than 60 Hypsiglena (p. 72) 



Scale pits double 100 



100. Posterior maxillary teeth not grooved; 8 or 50 (or more) dark bands 



on body ; scale rows 19 or 21 medially Pseudoleptodeira (p. 113) 



Posterior maxillary teeth grooved ; dark bands on body reduced to spots, 

 or no less than 10, or if more than 40 the scale rows 23. 



Leptodeira (p. 86) 



Family TYPHLOPIDAE Jan 



Typhlopidae Jan, Elenco sistematico degli Ofidi, 1863, p. 9. 

 Type. — Typhlops Dumeril and Bibron. 



Genus TYPHLOPS Dumeril and Bibron 



Typhlops Dumeril and Bibeon, Erpetologie g^nerale, vol. 6, 1844, p. 279. — Taylob, 

 Univ. Kansas Sci. Bull., vol. 26, 1939 (1940), pp. 441^44, figs. 1-2 (Mexican 

 species). 



Genotype. — AngvAs luonhricalis Linnaeus. 



Range. — Central Mexico southward through northern Argentina; 

 West Indies; Hawaii (introduced) ; southern Asia; southern Europe; 

 Ceylon; Africa; Madagascar; Mauritius; Socotra; Comoro Islands; 

 Australia; Philippine Islands; Caroline Islands; Solomon Islands; 

 Loyalty Islands. 



Species. — About lYO species are known in this genus ; some 20 occur 

 in the Americas, 3 in Mexico.* 



* Coniophanes meridanus Schmidt and Andrews only. 



• See Species Inquirendae, p. 200. 



