344 TEIID^. 



teeth compressed longitudinally, bi- or tricuspid. Head with large 

 regular shields ; anterior nasal in contact with its fellow ; nostril 

 in the suture between the two nasals or anterior to that suture. 

 Eyelids developed. Ear exposed. Limbs well developed, each with 

 five digits. Dorsal scales small ; ventral plates large, subquad- 

 rangular, smooth, forming regular series. A double collar-fold. 

 Femoral pores. Tail cyclotetragonal. 

 Tropical America. 



Synopsis of the Species. 



I. Six longitudinal rows of ventral plates ; head-shields small, 



numerous. 



Head-shields strongly keeled; mesopty- 



chium* with scarcely enlarged scales . 1. bridr/esii, p. 345. 



Head-shields not keeled ; a row of en- 

 larged shields on the mesoptychium . . 2. septeviUneata, p. 346. 



II. Eight rows of ventral plates ; caudal scales straight, keeled. 



Outer rowof ventrals considerably smaller 



than the others 3. festiva, p. 347. 



Outer row of ventrals as large as the 



others ; one row of large brachial 



shields 4. undulata, p. 347. 



Several rows of brachials ; male with a 



group of spines on each side of the 



praeanal region 5. edraccnitha^ p. 349. 



III. Eight or ten rows of ventral plates; caudal scales oblique, 

 smooth or feebly keeled above, smooth on the sides of the tail. 



Upper caudal scales perfectly smooth . . 6. lineolata, p. 349. 

 Upper caudal scales keeled ; eight rows 



of ventrals 7. tceniura, p. 350. 



Upper caudal scales keeled ; ten rows of 



ventrals 8. polops, p. 350. 



lY. Ten or twelve rows of ventral plates ; caudal scales straight, 

 keeled ; femoral pores less than 30 on each side. 



A. A broad band of enlarged gular scales across the throat. 



Second and third supraoculars separated 



from the frontal by granules 9. hifrontata, p. 351. 



Outer toe, laid forwards, not extending 



as far as inner 10. sunnamensis, p. 352. 



Outer toe extending as far as inner .... 11. p7eu, p. 354. 



B. A small central group of enlarged gulars. 



Four supraoculars 12. riisii, p. 354. 



Three supraoculars 13. vittipunctata, p. 355. 



* The space between the two collar-folds. 



