234 TYPHLOPIDJE 



Synopsis of the Families. 



A. No transpalatine ; pterygoids not ex- 



tending to quadrate or mandible ; no 

 supratemporal ; preefrontals forming a 

 suture with nasals ; coronoid present ; 

 vestiges of pelvic arch. 



a. Maxillary vertical, loosely attached, 



toothed ; mandible edentulous ; a 



single pelvic bone 1. Typhlopidae, p. 234. 



l>. Maxillary bordering mouth, forming 

 a suture with praemaxillary, prae- 

 frontal, and frontal, toothless ; lower 

 jaw toothed ; pubis and ischium 

 present, latter forming a symphysis . '2. Glauconiidae, p. 242. 



B. Transpalatine present ; both jaws 



toothed. 

 . Coronoid present ; praefrontals forming 



a suture with nasals, 

 a'. Vestiges of hind limbs ; supratem- 

 poral present. 



a". Supratemporal large, suspend- 

 ing the quadrate 3. Boidae, p. 244. 



6". Supratemporal small,intercalated 



in the cranial wall 4. Dysiidae, p. 249. 



b'. No vestiges of limbs; supratem- 

 poral absent r>. Uropeltidae, p. 251. 



b. Coronoid absent ; supratemporal pre- 



sent, suspending the quadrate. 

 ft'. Maxillary horizontal ; pterygoids 



reaching quadrate or mandible. 

 a". Praefrontal bones forming a 



- suture with nasals 0. Xenopeltidae, p. 275. 



b". Prsefrontals not forming a suture 



with nasals 7. Colubridae, p. 277. 



//. Maxillary horizontal, converging 

 posteriorly toward palatines ; pte- 

 rygoids not reaching quadrate or [p. 414. 



mandible 8. Amblycephalidae, 



c'. Maxillary vertically erectile, per- 

 pendicular to transpalatine; ptery- 

 goids reaching quadrate or man- 

 dible 9. Viperidae, p. 417. 



Family I. TYPHLOPIDAE. 



Cranial bones solidly united ; no transpalatine ; pterygoids not 

 extending to mandible ; no supratemporal ; praofrontals forming a 

 suture with nasals ; maxillary vertical, loosely attached, with a 

 few teeth ; no teeth on palate. Mandible edentulous ; coronoid 

 bone present. Vestiges of pelvis, reduced to a single bone on 

 each side. Body covered with uniform cycloid scales ; eyes under 

 the shields. 



